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Our 10 years of Lithium Iron Phosphate experience shared within thousands of articles, hundrends of tests and examples.


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16.02.2018
 
3.2V LFP cell initial charging

Question: How should new cells 3.2V  40AH, 60AH, 90AH, 100 AH, etc. be formed before first usage?

Answer: The new 3.2V LFP cells delivered from the warehouse are partially charged. However before the first use, it is essential to charge each cell to full capacity. The initial charging should be done with the charging current set to less than 1C (typically 0.5C), till the voltage level of 4.0 V is reached.

There is no other need for LFP 3.2V cells to be formatted or otherwise specially prepared for the use. After the first charge to full, the cell is ready to be used for use.

The above charging rule is also applied to the initial charge after the cell has been unused or stored for a long time. If not used more than 1 month, it is recommended to make again an initial charge to full.

   ...more >>

16.02.2018
 
12V LP battery balancing and charging

Question:  Can I charge the 12V LFP battery using a conventional auto-moto charger 12V?

Answer:  With most of “cheap” car battery chargers you **cannot** charge the 12V LFP battery. Cheap chargers often end charging at 14V.  As a result the LFP batteries are not charged sufficiently. In order to charge to full you need to reach above 16V.

If you have an “advanced” manageable charger, it can be used provided you can set the charge level to at least 16V.

Simply said: you can charge with any kind of charger if you make sure that the battery voltage reaches at least 16V, but does not exceed the maximum limit of 17V.

 

Question: What are the experiences of balancing 12V batteries, when, for example, four pieces of 12V/40Ah in the series?

   ...more >>

16.02.2018
 
You must charge the LiFePO4 before the first use!

Charge levels

 

You must charge before the first use!

We remind all users of the LFP cells and LP batteries that the cells and batteries MUST be charged to full voltage level BEFORE assembling into a pack and before starting to be used.

For the 3.2V cells, the full charge voltage level is 4.00V and the charging is described here.  For the 12V LP batteries the full charge voltage level is 16.00V. More details about the use of 12V batteries is here.

   ...more >>

16.02.2018
 
Using BMS to analyze the cell performance

BMS settings charge voltage

 

Why is the BMS needed for a LFP battery pack consisting of many cells?

Answer: The Battery Management System (BMS) allows you to monitor the battery pack operation. Since the battery consists of a serial string of many cells, you need to monitor each cell to prevent from deep discharge or over charge.  The BMS will give you information about the cell voltage levels and can issue warnings if there is a problem with any of the cells.

The BMS with balancing option will balance the cells (usually during charging) to make sure all cells have the same capacity (=voltage) levels.

The BMS also allows data logging so that you can see the history of the operation of the each cell in the battery. This way you can detect if there is any problem with one or more cells in the battery pack.

16.02.2018
 
Charging individual cells using the regulated (laboratory) power supply

Regulated laboratory charger

 

Charging individual cells using the regulated (laboratory) power supply

Many of the laboratory power supplies allow charging of the individual cells. Using such a regulated power supply is a suitable method for performing the initial charging or for the balancing of a single cell in a battery pack (by means of charging to a fixed voltage level).

There are usually 3 steps to follow:  1) set the target voltage (open voltage) – without the connection of the battery (3.65 at the picture), 2) start charging and set the current to be used (3.0 A at the picture), 3) when the charger reaches the target voltage – it usually starts to reduce the charging current until a low value. (3.66 V reached at 0.04A). It is a time to stop charging and disconnecting the charger.

16.02.2018
 
Initial charging FAQ

Initial charging FAQ

Check these FAQ published on our blog to understand the initial battery charging

 

We remind all users of the LFP cells and LP batteries that the cells and batteries MUST be charged to full voltage level BEFORE assembling into a pack and before starting to be used.  source

The new 3.2V LFP cells delivered from the warehouse are partially charged. However before the first use, it is essential to charge each cell to full capacitysource

   ...more >>

16.02.2018
 
Maximal voltage during Initial charge of LiFePO4

Maximal voltage during Initial charge of LiFePO4

 I want to make the initial charge of all the LiFePO4 cells to the same maximal voltage level of 4.0V. How can I do that?

 

EDIT: This article gives the example of 4.00V charge level. The same information is to applied for charging to other voltage levels: e.g. 3.65V, 3.70V, 3.80V, 3.90V. Different voltage levels may be applied for initial charging based on the manufacturer specification.

ANSWER: The best way it to find a power supply or a charger that will charge to the 4.0V directly.  Another solution is to charge using the laboratory power supply or the regulated power supply that allows to set the final (maximal) voltage limit. We suggest to check with the local electronic components suppliers for these products.

   ...more >>

16.02.2018
 
Initial charge voltage levels of LiFePO4

Voltage levels of LiFePO

 

 Initial charge voltage levels

Question: I wish to equip my workshop with the proper tools. Can you offer me following chargers: one model with cut off voltage at 3.65V, one model with cut off voltage at 3.80V and one model with cut off voltage at 4.00V?

Answer: There is no need to have so many different chargers.  The typical chargers that are sold by GWL charge to 3.65V (for single cell).  Please see some additional comments.

   ...more >>

09.02.2018
 
Sudden battery discharge

Sudden discharge of LiFePO4

FAQ: “Sudden” battery discharge

I have bought a several of LFP cells and made the pack with them to replace the lead-acid battery in my houseboat. The LFP battery was working great and it gives much more capacity than the lead acid. However after several weeks of usage, I came back after the weekend and I found out that the battery is completely discharged. Why this happen?

Please note that unlike the lead acid batteries, the LFP batteries will be completely damaged if you discharge them bellow the minimal voltage (usually >2.5V per cell, or bellow 10V for 12V battery). This may happen if you have some equipment that takes the power from the battery continually. Maybe you simply forget some light or some equipment „on“, and after few days the battery is deeply discharged and damaged forever.

   ...more >>

09.02.2018
 
LFP as starting battery

LFP as starting battery

LFP as a starting battery – two concerns

Question: I want to use the LFP battery (4x 3.2V cells) for starting of my car. What SBM should I use to protect the battery?

You cannot use a SBM to protect the starting battery. For starting the car, the current will be very high, hundreds or even nearly 1000 Amps, it is not possible to disconnect such high currents.

WARNING: Additionally it is not possible to disconnect the battery from vehicle circuits. The car electronics may burn or become faulty of the battery is suddenly removed from the circuit, as a result of disconnection, during the operation (when the engine is running).

   ...more >>

09.02.2018
 
History of LiFePO4 Winston technology

History of LiFePO4 technology

Difference between Winston Battery and other brands (1)

What is the primary difference between the Winston Battery LiFePO4 products and other brands that also offer prismatic cells?

1. Technology history

Thundersky Winston Battery

The Thunder Sky Winston Battery company was the originator of the large capacity technology for the prismatic cells. The technology was created by Mr. Winston Chung. By means of partnerships with several companies TS-WB transferred the production facilities to partner factories. However the core know-how and technology processes were retained by Mr. Winston Chung.

   ...more >>

09.02.2018
 
Operating temperature of LFP Cells

Temperature of cells

The temperature of the LFP cells

What is the operating temperature of the LFP cells?

The operating temperature of the LFP cells is based on the specification and the application.  There are several points to be clarified in this matter.  The first to clarify is the three different temperatures in relation to the batteries.

The ambient temperature

The ambient temperature is usually given as the air temperature of any environment where the batteries and related equipment are kept.  The ambient temperature is given at the specification of the cells.  It is also called the operation temperature.

   ...more >>

09.02.2018
 
Winston shipment in February

     Winston shipment February 2018 

    

 

The shipment of Winston Battery cells

The shipments of the Winston Battery cells are on the way, arriving in end of February and early March. Get ready for your orders. Contact the GWL Power team for more inquiries.  

09.02.2018
 
ThunderSky Winston new Factory

Winston Factory

Winston Battery New Factory – Winston Battery (Changtai) Limited

All cells delivered since mid 2017 have been made in the new factory. The factory provides enough space to accommodate the growing demands for the LFP prismatic cells. 

30.01.2018
 
Can you recommend a device to protect a 12V LP battery?

 

Can you recommend a device to protect a 12V LP battery?

In the past we used to offer a solution called Akumon. However due to a small demand, the production of Akumon was discontinued. We also offered some Battery Guard, Battery protector, Battery protect, PowerTector, etc.  

   ...more >>

29.01.2018
 
LFP battery discharged to ZERO volts

LFP battery discharged to ZERO volts

Question: I have installed a LFP battery in my car. But when I came today to the car, the car was completely dead and all electronics stopped working. What is wrong?

Answer: What you describe may happen with the car. When the car is parked, over some days, then some equipment will discharge the battery to complete emptiness (full deep over-discharge).

  • This may happen when the small “inside” lamp is by mistake left “on”, or when the door is not closed properly. 
     
  • It may also happen that the radio was left “on” – but silent, or some other equipment drained the battery (e.g. alarm system that turned on for some reason).
     
  • In some cases the driver may accidentally forget the main headlights on, and the battery will be depleted just in a few hours.
     
  •    ...more >>

22.12.2017
 
Packing of Sinopoly cells

    

 

The photos show the packing of the Sinopoly cells. The cells are packed in wooden boxes that meet the ADR safety regulations for the transport of dangerous goods. 

22.12.2017
 
Production fault - reversed polarity

 

Sometimes a mistake may happen…. This photo shows a ZG-LFP 20AH cell that has a reversed polarity marking. The problem was cased during the final part of the production, as the outer sleeve with the polarity symbols (plus/minus signs) was put in opposite direction.  The cell is completely OK, only the marking is reversed. 

This real situation shows that even after a multiple checking of the production, a faulty product may slip out. This case also shows the need for the final responsibility of checking during the installation of the cells. There is always need to check everything to the very last detail and not relying just on signs and marking. 

In this case we have honored the warranty and replaced the cell with another new cells with proper marking.

21.12.2017
 
Become the battery specialist and visit GWL Power in Prague for the Battery Technology Training Seminar

 

The Battery Technology Training Seminar – March 9th 2017, Prague, Czech Republic

Become the battery specialist and visit GWL/Power in Prague for a battery technology training seminar. 

GWL/Power invites you to come, meet members of GWL and Sinopoly team face to face, learn more about LiFePO4 technology and other related topics.  The training includes the presentations, discussions and technology demonstrations.

Check here for more details

21.12.2017
 
The voltage levels for BMS

 

he BMS provided by GWL are primarily designed for the LFP cells (2.0V to 3.8V). Some BMS models support the LTO and Li-Ion cells as well. 

BMS123Smart - supports LFP and Li-Ion, does not support LTO 

BMS2405 - supports LFP,  Li-Ion and LTO

   ...more >>

20.12.2017
 
Checking and checking again

   

 

Any system can have a failure or an irregular operation. That is why it is important to perform multiple tests and verifications of each installation.

With battery systems the possibility of a failure or malfunction is multiplied by the number of the cells or the complexity of the installation. For a system with 2 cells, with 20 cells and with 200 cells the possibility of “problem” will be multiplied 2 times, 10 times and even 100 times.

The photo shows an example of a failure of the BMS system in a 4 cell installation. The BMS module reports a voltage and temperature that is not correct. Making a measurement of the cell proves the failure condition of the setup. In this case, caused by a defective BMS module that needs a replacement.

Our recommendation: the battery pack should have regular inspections and verifications performed.

20.12.2017
 
AutarcTech - energy storage partner in Germany

    

 

The AutarcTech company is using the cells from GWL to make the energy solution. Learn more about  AutarcTech and their products. 

AutarcTech GmbH
Technologiepark 1
91522 Ansbach
Deutschland
Tel. 0981 9878 7374
www.autarctech.de

AutarcTech GmbH, founded 2010 in Ansbach, Germany, designs and produces Lithium batteries and Batterie-Management-Systems (BMS).

Our next-generation technology sets us apart from the standard battery storage systems. Active balancing significantly increases life-expectancy of the lithium cells. This process is automatically performed when required during the entire charge and discharge cycle. The effective useable capacity of the battery is maintained. Because the energy from one cell is transferred to another, the balancing process does not rely on wasting energy to heat and becomes far more efficient.

   ...more >>

18.12.2017
 
GWL/Power Simple Battery Management Board 4 cells (12V/16A)

 

The SBM04/16H is designed for a simple protection of the 12V battery packs using the 3.2V LFP cells. 

The SBM has higher rating resistors (bigger ones) so that the balancing current is little bigger. For even higher balancing currents we suggest adding the CBM1 module or modules. The examples of the installation are here: 12V battery24V battery48V battery.

18.12.2017
 
SBM for 24 cells (72V)

 

The SBM board SBM24/40 is specially designed for high-power EV-Bikes and e-Scooter projects with voltage 72V (24 LiFePO4 cells).

18.12.2017
 
BMS123 Smart with Victron inverters

 

Check the connection of the BMS123 Smart with thetThe Victron inverters: These are equipped with AUX I/O (allow to charge) and Temp sense (allow to discharger ports. The charge/discharge contact functionality is available only in case the Lithium assistant function is activated.

18.12.2017
 
Sinopoly 300AH cell discharge diagram

graf

The diagram shows the discharge of the Sinopoly 300AH cell at 0.3C rate, at room temperature. This is a 100% DOD cycle, with discharge up to 2.5V.  

This diagram shows that reaching the 3.0V level at the 0.3C rating corresponds to 90% DOD. 

Be sure to contact us for more support about the LiFePO4 cells. 

18.12.2017
 
GWL/Power BMS123 Smart - Extended Module

BMS       bms_smart

 

Extended module for advanced applications like automotive, boat and other applications using the BMS123 Smart.

The module adds the following functionality to the BMS123 Smart system:

  • 4 configurable relays - switch relay on at time or conditions
       
  • 2 individual CAN bus connections
      
  • Control Elcon/TC Charger via CAN bus interface
     
  • Broadcast BMS settings on CAN bus
      
  • Compatible with EV charging stations using the J1772/IEC 62196 protocol - adaptive charging. Extended module limits charging current to the maximum current of the charging station/vehicle.
      
  •    ...more >>

01.12.2017
 
Check the batteries (cells) before the installation!

 

Always check the technical specification of the cells and other products BEFORE the installation. 

Check the voltage, polarity, dimensions, mechanical shape, the proper design of the terminals, etc. Be sure to report any strange conditions to us BEFORE the operation and installation of the cell or other product. 

We will be happy to provide support for any irregular situation.

Learn more at the “Important information for batteries” page.

01.12.2017
 
The Sinopoly Battery Seminar

  

 

GWL/Power has organized a specialized seminar for the LiFePO4 battery technology. See the photos from The Sinopoly Battery Technology Training Seminar on 9th of March.

01.12.2017
 
Changing the number of cells for BMS123-Smart

 

Question: I have BMS123-Smart with 4 cells. When I add more cells, they are not recognized by the system.

Answer: You need to change the setting of the BMS123-Smart to match the number of the cell that will be recognized.

See the manual section “Hidden factory settings”.  This setting allows changing the size (rating) of the current sensor and the number of the cells in the pack.

The setting is recorded by the opening of the switch No 8, as the manual explains:

Set all switches below in the right positions for current sensor and number of cells and toggle switch 8 ON and OFF again. The hidden settings are now stored in the BMS. Set the switches back in the original positions. Please be aware it could be necessary to follow the current sensor calibration procedure again.

   ...more >>

01.12.2017
 
The condition of the safety valve

 

Question: When making the regular inspection of the battery pack, I noticed that there is some salt-like powder around the safety valve. How does it come about?

Answer:

1. New cells

All cells shipped by GWL/Power are visually inspected before delivery. They are delivered in 100% perfect condition. If you receive a new cell right from the shipment and there is some dirt or moisture around the terminal, you should contact the shipping agent and place a complaint about the damage during the delivery. You can also contact GWL/Power for additional assistance prior using the cell.

2. Used cells – regular maintenance

As concerns cells that are used for some time already, these cells should be inspected regularly every few-hundred cycles. See support info here. There should be no leakage or substance around the terminals or around the safety valve. We suggest cleaning the cells every time the inspection is made.  You can use a lightly wet cloth to clean the outside of the cells.

   ...more >>

21.11.2017
 
How often should I check my cells (or my battery pack)?

Check_cells

 

The answer depends on the type of application. See some examples.

1. Simple installations

Simple installations with one battery (12V) or with just a few cells do not need any special inspections. If you have a SMB to handle the protection of the pack, you can just monitor the voltage level. This kind of pack should be inspected once or two times in a year. Or perhaps each time after a longer pause in usage.  Note: do not forget to disconnect all electronics if not using the pack.  The pack should have a dual protection, as explained here.

 

2. Advanced installations

More advanced installations (typically with 8 cells and more) should be monitored regularly. It is recommended that the inspection of the pack is performed in these intervals (ie, after number of discharge / charge cycles):

   ...more >>

09.11.2017
 
Determining the size of cells based on current and operation time

 

FAQ: Determining the size of cells based on current and operation time

Question:  I need a battery pack to supply 60 Amp continuously for 8 hours. What size of the battery do you recommend?

Answer: The above table shows the size of the battery packs (in Ah) based on the 100% DOD (depth of discharge) and 80% DOD. 

The 80% DOD cycle is typically used according to the specification of the manufacturer to reach the optimal life span (cycle life) of the battery pack.

For a pack running for 8 hours at 60 Amp, at 80% DOD, the capacity of the cells should be at least 600Ah.  

Tip: you can assemble the 600Ah cell using the 3x200Ah or 2x300Ah single cells in parallel

08.11.2017
 
GWL/Power battery pack demonstration

 

The simple solution for energy needs. A  2.2 kWh battery pack made from 8 cells (total 24V/90Ah), with BMS123 Smart installed. This is a basic component solution for further integration in customer projects. 

08.11.2017
 
Promotion of the ZG Cells at InterSolar/ESS 2017

 

GWL/Power has been promoting the small size cells ZG 20 AH and 60AH

These cells are suitable for high power applications with continuous currents of 3C to 5C. 

Be sure to follow with us for more details on the application of these cells.

08.11.2017
 
Winston Battery application

 

Example of the Winston Battery application. A 24V battery pack for telecom offgrid applications….  as visible at InterSolar (at a partner booth)

07.11.2017
 
GWL/GreenEye at Intersolar/ESS 2017

 

GWL/GreenEye at Intersolar/ESS 2017

GWL/Power was showing the 12V batteries with the GWL/GreenEye smart technology for monitoring using the mobile phone application. 

07.11.2017
 
Multiple terminals of the high power cells

The large capacity Winston cells 700AH, 1000AH are equipped with multiple terminals. All terminals are mutually connected and there is no difference between them.

The terminals of the small cells like 40AH, 60AH, 100AH, 160AH can be used for continuous loads with rating up to 100 Amp currents.  The larger terminals of the 200AH cells to 400AH cells can withstand some 300 to 400 Amp currents. 

Please note that for high power applications with currents above 100Amp (continuous) the cabling and connector mounting must be realized in a very precise way with corresponding load rating.  

For high power applications, with continuous load demands, it is recommended to use multiple terminals. This is the purpose of the multiple terminals on the large 700AH and 1000AH cells. 

In simple words: if you have continuous power rating more than 100 Amp, we always suggest using the multiple terminals.

07.11.2017
 
LTO cells for industrial packs and solutions

GWL/Power is offering a variety of LTO technology based cells that allow to assemble the battery packs for special applications:

  • high speed charge and discharge
  • low temperature operations  (up to -35°C)
  • high temperature applications (up to +70°C)
  • extended life span of the cycle life:  4000 cycles at 1C and more

Be sure to contact the GWL/Power team with your demands for details on the LTO solution. 

 

06.11.2017
 
The LTO customized pack solutions - life is easy!

pack

The innovative LTO cells allow a simple and easy assembly into the packs. As a result any company or individual with basic skills in electronics is now able to produce the battery packs with excellent performance. There is no need to use the welding machines to fix the contact terminals to the cells.  

The LTO cells have the outstanding energy performance and mechanical safety. 

The LTO cells bring the energy solutions into a new level. 

The team of GWL/Power will be happy to assist you in your projects. 

03.11.2017
 
The temperature of the LFP cells

What is the operating temperature of the LFP cells?

 

The operating temperature of the LFP cells is based on the specification and the application.  There are several points to be clarified in this matter.  The first to clarify is the three different temperatures in relation to the batteries.

The ambient temperature

The ambient temperature is usually given as the air temperature of any environment where the batteries and related equipment are kept.  The ambient temperature is given at the specification of the cells.  It is also called the operation temperature.

The cells can be stored and operated within these temperature limits. However the performance of the cells is dependent on the temperature so the performance of the battery differs in various temperatures.  In simple words, when the cell is cold (bellow zero) the performance is limited, when the cell is hot (above 40 °C) the drain of the cell must be limited as well in order to protect against overheating.

   ...more >>

16.10.2017
 
The temperature of the LFP cells

The temperature of the LFP cells

What is the operating temperature of the LFP cells?

The operating temperature of the LFP cells is based on the specification and the application.  There are several points to be clarified in this matter.  The first to clarify is the three different temperatures in relation to the batteries.

The ambient temperature

The ambient temperature is usually given as the air temperature of any environment where the batteries and related equipment are kept.  The ambient temperature is given at the specification of the cells.  It is also called the operation temperature.

The cells can be stored and operated within these temperature limits. However the performance of the cells is dependent on the temperature so the performance of the battery differs in various temperatures.  In simple words, when the cell is cold (bellow zero) the performance is limited, when the cell is hot (above 40 °C) the drain of the cell must be limited as well in order to protect against overheating.

   ...more >>

05.08.2017
 
How to choose the jumpers and screws to the battery?

 

Question:
What terminal connectors and screws to choose for your battery and cells? 
 
Answer:
Complete list and recommendations you can find here.
   ...more >>

28.07.2017
 
Multiple terminals of the high power cells

Multiple terminals of the high power cells

The large capacity Winston cells 700AH, 1000AH are equipped with multiple terminals. All terminals are mutually connected and there is no difference between them.

The terminals of the small cells like 40AH, 60AH, 100AH, 160AH can be used for continuous loads with rating up to 100 Amp currents.  The larger terminals of the 200AH cells to 400AH cells can withstand some 300 to 400 Amp currents. 

Please note that for high power applications with currents above 100Amp (continuous) the cabling and connector mounting must be realized in a very precise way with corresponding load rating.  

For high power applications, with continuous load demands, it is recommended to use multiple terminals. This is the purpose of the multiple terminals on the large 700AH and 1000AH cells. 

   ...more >>

12.07.2017
 
Sinopoly 300 AH Cells Quality

Long-term testing has confirmed the quality of the Sinopoly cells. We tested more than 300 pieces of battery cells with the results we can share with our customers. They were came very similar. You can judge on the attached graph yourself. The cells was measured at 3.65V - 2.5V discharging current 100A (0.3C)

11.06.2017
 
The GridFree inverters for the energy solutions

 

The GridFree inverters for the energy solutions

The 1000W and 2000W GridFree Smart inverters for energy self-generation. 

11.06.2017
 
GWL/GreenEye at Intersolar/ESS 2017

GWL/GreenEye at Intersolar/ESS 2017

GWL/Power was showing the 12V batteries with the GWL/GreenEye smart technology for monitoring using the mobile phone application. 

06.06.2017
 
Winston Battery application

 

Winston Battery application

Example of the Winston Battery application. A 24V battery pack for telecom offgrid applications….  as visible at InterSolar (at a partner booth)

31.03.2017
 
Serial connection of 12V batteries with PCM and bluetooth

Question:

I need 48V LiFePO4 battery and I want to use 4 pcs of 12V batteries https://www.ev-power.eu/LiFeYPO4-batteries-12V-1-1/LiFePO4-Battery-12V-22Ah-with-PCM-and-Bluetooth.html in serie connection.

Is it possible to do it?

 

Answer:

This connection is not possible. This battery integrates protective PCM module with Bluetooth monitoring which can not work in 48V system. The integrated PCM module and bluetooth monitoring will be demaged so you will not be able to monitor and the battery will not be protected against overcharging and undercharging anymore if these batteries or their 11Ah version will be connected in serial.

Parallel connection to increase capacity is possible. Applications for monitoring can monitor max. 10 pieces of the batteries.

If you need to create a 48V battery, you can use a single 3.2V LiFePO4 cells ie. https://www.ev-power.eu/LiFePO4-special-cells/ + protective board https://www.ev-power.eu/SBM-CBM-1-1/ 

29.03.2017
 
What is the capacity of LiFePO4 cell which is storaged for 4 years?

We have the Winston 1000Ah cell LFP1000AHC in our showroom for presentation.  This high capacity cell was purchased in 3/2013. We checked the health of this cell now and what is the result?

 

Absolutely great! The capacity is 1240Ah at 100A charging/discharging current and temperature 20°C . It means the cell has 124% of the nominal capacity after 4 years.

test-1000ah

Check the all high quality Winston cells.

22.07.2015
 
Defective Cell

What should I do in case of suspicion that the battery in the pack is defective?

----------------------------------------------------------

Before we will start suspect the cell from being defective, please check following:

1) Please verify if this is not just the weakest cell in the pack. It might be possible that this cell is about 40Ah capacity and all others are 45 Ah, which might be misleading. 
2) If you can charge the single cell in suspicion, please do so in first place. Your target is to charge the cell to the same level as the others. 
3) It might be worth trying to switch balancing module from another cell and watch the system carefully for next few cycles. If your BMS does not support such an option, just switch the cell position with another cell.

If you can give us any logs from BMS, graphs or anything, please send it to us. We need data about at least few charging and discharging cycles of each individual cells to evaluate the cells health. Without appropriate monitoring and logging it is impossible to judge if the cell is defective or   ...more >>

01.07.2015
 
Test results of CALB cells

Can I obtain test data of purchased CALB cells?

----------------------------------------------------------

Yes, CALB provide the data from output quality control of each cell.

You can see the Internal resistance, Voltage level (open circuit) and also the measured capacity.

How to do it:

1) You can check the parameters of purchased cells on this battery shipment data query web page.

2) Choose if you want to check single cell or you can upload file of the serial numbers by choosing Multi Barcode Query

Choosing

3) The serial number starts at "P". Use this serial number

serial number

4) Use txt file format with each serial number at new row if you want tu upload a batch of cells.

5) Click on "Search" and the system will show you following table

   ...more >>

24.06.2015
 
Size of the terminal connectors

Question:

What is the size of the terminal connectors used for LiFePO4 cells?

 

Answer:

Here is the link with overview of the cell terminal connectors and the compatilibity guide.

Terminal connectors of all WINA LiFePO4 are made from M6 screws.

19.06.2014
 
Yttrium additive

Question:

What is the difference between battery technology with addition of Yttrium, and batteries without Yttrium?

 

Answer:

Some manufacturers of LiFePO4 batteries complement the chemical structure of the composition of the element Yttrium (Y).

The chemical structure is in stead of LiFePO4 (LFP) changed to LiFeYPO4 (LFYP).

See the chemical composition LiFeYPO4 batteries according to the manufacturer:
http://gwl-power.tumblr.com/post/180659445/the-material-composition-of-the-lifeypo4-battery

The essential difference is in the behavior of chemical elements yttrium and iron. While iron is very susceptible to oxidation and reactions with other chemical compounds, the element yttrium is more chemically stable, not easy to to reach with other compounds.

   ...more >>

09.06.2014
 
Starting gasoline engines with LiFePO4

Can I use LiFePO4 12V Block Battery for starting of the combustion engine?

----------------------------------------------------------

Yes, this way can be used.

In the Principles do not require any special electronics for use LP 12V batteries for starting,
but it is very important to keep min. and max. voltage,
so we recommend using any voltage indication unit, which you will be informed about the current Voltage.
This is important especially for frequent starting.

We recomend use some simple car Voltmeter.

We offer a indication voltmeter PROM-VOLT or CellLog.

If after trying to start, the battery voltage returns above 12V, then you can start again.
If the voltage does not go back to the 12, then already starting with this battery can no longer perform, because could damage the battery.

04.06.2014
 
Replacing KOKAM Li-Pol cells

How to replace Li-Po cells KOKAM by LiFePO4 cells?

----------------------------------------------------------

Generally said LiFePO4 Cells and batteries are very suitable for similar traction application and can meet all requirements that customer need. If connected in parallel, they can also meet capacity requirement.

The most suitable cells are Wina 100Ah cells: http://www.ev-power.eu/_d2900.html

Wina cells offers high power density - they are little bit smaller having same capacity as other LiFePo4 cells. They also provide wonderful discharge capabilities - very high currents with minimum voltage sag. These cells can meet requirements of high charge and discharge currents, versatile temperature operation range, much longer life then Kokam cells (minimum 2 to 3 times more) and other advantages.

However, it is necessary to solve some technical differences:

  • Dimensions  - question: what space is available for battery? Kokam battery cells have a different size than the suggested WINA LiFePO4 cells.
  • Nominal Voltage - LiFePo4 technology dispose of slightly different voltage then Li-Po cells. Nominal voltage is 3.2V instead of 3.7V. Important to check the voltage requirement of the motor controller and other equipment.
  •    ...more >>

04.06.2014
 
Battery pack for motor yacht

Can you help me choose battery pack 12V/700AH for sailing yacht?

----------------------------------------------------------

If the sailing yacht is equiped by 2 alternators with up to 140A charge current, one 230V charger with 120A charging current and a solar system with 40A charge current we suggest following solution:

Ideal solution for this case is to use LiFePO4 cell which are suitable for electric boats, cars and other EV application because the LiFePO4 technology is safety and there is long lifetime and thousands charging cycles.

For achieving 12,8V of battery is suitable serial connection of four 3,2V 700Ah cells. More information about battery banks and LiFePO4 advantages:http://www.ev-power.eu/BatteryPacks/
There is need a LiFePO4 charger for 12 V battery bank and monitoring and protection equipment.

There will be use the professional monitoring system BMS123-OFFGRID. More information and possibilities of the BMS123: http://gwl-power.tumblr.com/tagged/BMS123

   ...more >>

29.05.2014
 
Initial charging

Can I use the battery immediately after unpacking the shipping box?

----------------------------------------------------------

No, first you must fully charge the battery - the first initialization charging.

All goods we supply is new direct from the manufacturer.
The batteries are charged conservation.
To be able to use it must first be charged with a low current.
The first charge should not exceed 0.5 C - that for your cells LFP040Ah is 20A.

   ...more >>

18.05.2013
 
CALB - China Aviation Lithium Battery products

CALB - China Aviation Lithium Battery products

Check our offer for the CALB products at EV-POWER.EU

http://www.ev-power.eu/CALB-40Ah-400Ah/

10.05.2013
 
WINA 10AH LiFePO4 cell - high current peak discharge

WINA 10AH LiFePO4 cell - high current peak discharge

The test results of the high current peak discharge of 5C and 7C for WINA 10AH cells.

 

01.05.2013
 
EVBIKE with WINA LiFePO4 battery

EVBIKE with WINA LiFePO4 battery

The photos show customer references for bicycles concerted to electric bike using the EVBIKE components.

The top design shows battery pack with WINA cells.  The discharging information log data recording is also provided.

28.04.2013
 
Custom battery pack 48V 10AH using WINA cells

Custom battery pack 48V 10AH using WINA cells

A photo from a customer project using 16 cells WN10AH to make a 48V 10AH battery pack for a “super EVBIKE”. The management of the pack will be done by means of the SBM board.

The details about the small capacity LiFePO4 cells
http://www.ev-power.eu/LiFePO4-small-cells/

The SBM boards at this GWL/Blog
http://gwl-power.tumblr.com/tagged/sbm

The SBM boards at EV-POWER.EU
http://www.ev-power.eu/SBM-CBM-1-1/

19.04.2013
 
Solar and Storage

Solar and Storage

The initial charging of a battery pack for the energy storage solution. This battery pack will be using the WINA cells of total capacity 28.8 kWh.

 

14.04.2013
 
Testing the ESS solution - 1.5 MegaWatt of cycled storage reached

Testing the ESS solution - 1.5 MegaWatt of cycled storage reached

We keep running and testing the Energy Storage Station. During each cycle we store and release about 5 kWh of energy. For testing we make 3 cycles a day. In the last 100 days we made 300 cycles already and stored and released the total of 1.5 MegaWatt of energy.

30.03.2013
 
QUESTION: Are the lithium cells charged before shipping to the customer?

QUESTION: Are the lithium cells charged before shipping to the customer?

ANSWER: No. The cells are not charged. They are shipped in the same condition as received from the factory. The cells are shipped with 50% and less energy left in them. The cells must be charged to full and balanced (equilibrated) by the customer before the installation of the battery pack.

For safety reasons it is forbidden to transport the batteries that are fully charged. In case of an accident the fully charged cells would release all energy and could cause serious damage. The less energy is left in the cells during transportation, the safer the transportation is.

During the manufacturing process, the initial charge is made at the factory. Following this initialization charge, the introductory charge and discharge cycles may be performed at the factory to verify the cells specification, capacity and internal resistance. After these test cycles the battery is usually left at 50% capacity, ready for the shipping.

   ...more >>

29.03.2013
 
The brand name Samsung Li-ON cells have very poor life-cycle performance.

The brand name Samsung Li-ON cells have very poor life-cycle performance.

Please see the information from the official Samsung datasheet. This information shows that the life span for the ICR 18650-26A model is only 300 cycles!  After 300 cycles the capacity will drop to 70%.  What a contrast with the LiFePO4 cells that have 2000, 3000, 4000 or even 8000 full cycles.

We suggest avoiding the usage of such Li-ON cells for any serious applications.

Please think about this: if the TOP manufacturer Samsung gives „confidential“ information with such a low cycle life span, how much lower will be the life span of the identical cells produced by some no-name Chinese manufacturers?  Well we even do not wish to try to guess what the reality may be.

29.03.2013
 
QUESTION: I want to make the initial charge of all the LiFePO4 cells to the same maximal voltage level of 4.0V. How can I do that?

QUESTION: I want to make the initial charge of all the LiFePO4 cells to the same maximal voltage level of 4.0V. How can I do that?

EDIT: This article gives the example of 4.00V charge level. The same information is to applied for charging to other voltage levels: e.g. 3.65V, 3.70V, 3.80V, 3.90V. Different voltage levels may be applied for initial charging based on the manufacturer specification.

ANSWER: The best way it to find a power supply or a charger that will charge to the 4.0V directly.  Another solution is to charge using the laboratory power supply or the regulated power supply that allows to set the final (maximal) voltage limit. We suggest to check with the local electronic components suppliers for these products.

Optionally it may be possible to use the single cell charge for 3.6V (for example the 3.6V/20A model). It can be used to make the bulk charging to 3.6V. After making the charging with this charger (to 3.6V), it may be possible to make the final charging from 3.6V to 4.0V using a 4V or 5V power supply. 

   ...more >>

13.02.2013
 
Say NO to Li-ON! Say YES to LiFePO4

Say NO to Li-ON! Say YES to LiFePO4

We keep discouraging our customers from using the Li-ON (3.6V or 3.7V per cell) technology. We strongly recomend using the safe LiFePO4 technology (3.2V per cell).

The diagram shows the discharging characteristics of the Li-ON versus LiFePO4. The LiFEPO4 batteries have much more stable discharge curve, with less performance degradation.

13.02.2013
 
1937 Jaguar Electric Vehicle Conversion Lithium LifePO4 Battery

1937 Jaguar Electric Vehicle Conversion Lithium LifePO4 Battery

Lithium electric Jaguar conversion by North Valley Systems llc. in Montana. It is using the WINSTON BATTERY 260AH LiFePO4 batteries that contain 25 KW hours of power. Over 100 mile (160 km) range. Top speed is rpm limited by the controller to 103 mph (160kmph). 1000 amp Zilla at 110 vdc gives over 100 KW of potential acceleration power.

13.02.2013
 
The Li-POLY are dangerous! Boeing needs to learn this as well

The Li-POLY are dangerous! Boeing needs to learn this as well

The li-polymer batteries (with 3.6V voltage) are quite dangerous. They can burn or even explode.  We strongly DISCOURAGE to use the li-ion (or li-poly) batteries in any kind of aviation applications.

   ...more >>

12.02.2013
 
WINA 10AH LiFePO4 cells

WINA 10AH LiFePO4 cells

LiFePO4 cells with excellent parameters.

Check here:
http://www.ev-power.eu/WINA-30Ah-100Ah/

12.02.2013
 
Is there a difference between 100AH and 100AH?

Is there a difference between 100AH and 100AH?

The test data prove quite some difference in the performance of LiFePO4 cells from various manufactures. This test shows the difference between discharge results of GBS 100AH and WINA 100AH.

The discharge times at 1C (105Amp) from full charge to 12V are: 3000 seconds for GBS100AH, 3790 seconds for WINA100AH. The difference is 26%.  When calculating the total energy, it is obvious the performance of the WINA100AH cell is 20% to 30% higher.

Which cell will you choose?

08.02.2013
 
The TUE.nl project: LUPO EL

The TUE.nl project: LUPO EL

The Lupo EL (“Electric Lightweight”) vehicle combines a very low weight (1,060 kg, 2,337 lbs) with a large battery pack (27 kWh). This results in a range increase of 30% to 50% in comparison to existing electric vehicles with four seats on the market today— 215 km (134 miles) urban and 135 km (84 miles) highway on the Artemis cycle. Despite the presence of a large battery, the interior and cargo space dimensions remain unchanged.

Batteries: Winston Battery/Thunder Sky TS-LFP90AHA, capacity 90 Ah, 3.3V, cycle life > 2000 @ 80% DOD, chemistry: LiFePO4, 91 cells in series, 273 kg, 27 kWh

More details here:
http://www.greencarcongress.com/2011/04/lupoel-20110409.html
http://www.evalbum.com/3842

30.01.2013
 
WINA 100AH cells - terminal modification

WINA 100AH cells - terminal modification

The new shipment of the WINA cell comes with a new design of the terminals. The copper/aluminum terminals are now bigger, allowing for higher currents to flow with lower resistance.

28.01.2013
 
CALB CA Cells Series Test Reports

CALB CA Cells Series Test Reports

Download and check the latest test reports for the CALB CA100 and CA180 series. The tests show the results of full cell abuse, including short-circuit, cell crushing, braking and nailing.  The cells show that no fire or explosion occured.

http://www.ev-power.eu/docs/pdf/Test-Reports/CALB-CA100FI-TestReport.pdf
http://www.ev-power.eu/docs/pdf/Test-Reports/CALB-CA180FI-TestReport.pdf

28.01.2013
 
The CALB SE70AHA Test Report

The CALB SE70AHA Test Report

Download the test report of the SE70AHA LiFePO4 cell.

http://www.ev-power.eu/docs/pdf/Test-Reports/CALB-SE70AHA-TestReport.pdf

20.01.2013
 
The discharge tests for SE180AHA and CA180FI

The discharge tests for SE180AHA and CA180FI

The results of discharge tests for the CALB cells:

The test were made by EVTV and the complete information is here:
HTTP://23.21.184.60/2012/07/CALB-CA180FI-NEW-LIFEPO4-CELL/

20.01.2013
 
Cold temperature tests of SE100AHA and CA100AHA

Cold temperature tests of SE100AHA and CA100AHA

The graphs show the test results of cold temperature discharge tests for the CALB SE100AHA and CA100AHA cells. The performance is compared with tests at 31*C (88F) versus cold temperature -18*C (0F) to -4*C (25F) (the cells keep warming-up as they are discharged).

The tests were made ba EVTV and the details are available here:
http://blog.evtv.me/2012/07/the-cold-weather-of-july-in-cape-girardeau/

19.01.2013
 
How much to have 10,000 Wh?

Q: How much cells are needed to have a 10 kWh (10 000 Wh) energy backup system?

Answer: The number and size of the LFP cells is dependant on the voltage level to be used for the DC system. Usually 12V or 24V systems are used for small off-grid installations. 36V or 48V is used for the hybrid-grid or grid-tied applications.

The calculation may be:

12.01.2013
 
The 5 kWh Universal Energy Storage Setup

The 5 kWh Universal Energy Storage Setup

A practical realization of a mid-sized energy storage solution with 5 kWh of energy capacity. The modular design to work with the 230V AC grid.

The practical demonstration of the basic components to realize the energy storage solution with an easy expansion and many options to increase the size of the storage and the power output.
 
Components description of the universal energy storage

* Lithium Battery Pack 36V
Battery pack 36V 130Ah made of 12 units of finely balanced  SE130AHA LiFePO4 cells. The nominal capacity is 5 KWh of energy (38V x 130Ah).  Bigger sized cells can be easily used to increase the total capacity of the storage.
http://www.ev-power.eu/_d2904.html (USD180 per unit, total USD 2160 for 12 pcs)
 
* BMS system - BMS123 Solution 
The BMS system protects the batteries against deep discharge and against over charge. It also monitors every cell and provides data to the BMS Main Controller. Each cell has the BMS Cell Module installed. The setting is set for 44V as max charge voltage (3.70V per cell) and 35V as deep discharge voltage (2.95V per cell). The BMS is powered from a 12V battery independently of the main power battery.
http://www.ev-power.eu/BMS123-System/ (USD430 Main Unit, USD200 Cell Modules, USD150 additional components)
 
* DC contactor relay
The relay is designed to disconnect the DC/AC inverters from the batteries in case of deep voltage discharge.  The DC contactor is managed by the BMS Main Controller. http://www.ev-power.eu/_d2649.html (USD20)
 
* DC/AC Grid-tied   ...more >>

06.01.2013
 
Micro Energy Storage Setup

Micro Energy Storage Setup

NOTE: this is a grid-tied system setup with a energy backup to the batteries. This system is grid-tied only. The micro-inverter works only when the grid is present. If the grid is down, the system does not work. It is NOT an off-grid system.

——————————————————————————————

A practical realization of a small size energy storage solution with 3.2 kWh of energy capacity with 230V/230W AC grid-tied power output. The basic concept of the energy storage with easy expansion.

Components description of the complete setup

* Lithium Battery Pack 36V
Battery pack 36V 90Ah made of 3 finely balanced 12V/90AH LP batteries. The nominal capacity is 3.2 KWh of energy.  There can be more batteries easily added to increase the capacity of the storage.
http://www.ev-power.eu/_d1873.html  (USD430 per unit, total USD 1290 for 3 pcs)

   ...more >>

01.01.2013
 
Welcome in 2013! The year of the solar and energy-storage revolution.

Welcome in 2013! The year of the solar and energy-storage revolution.

In 2013 we continue to help the worldwide community by means of the Solar Energy solutions: affordable solar panels 20Wp to 280Wp, direct solar invertors, sine inverters and micro-invertors. Energy Storage: DC power solar chargers, hybrid and grid-tie invertors, off-grid power solutions. Lithium Cells: high capacity lithium cells from 10AH to 1000AH. Chargers: complete battery charging and BMS management solution. Check for details about the GridFree solutions at the GWL/Blog pages.

28.12.2012
 
A battery quiz

A battery quiz

1) How much is the total capacity in Watthours of all of these batteries on the picture? (Calculated at the nominal 3.2V level)

2) How much is the total weight (in kilograms) for these batteries?

Let us know by means of the form on the right. 

(send replies before January 15th, 2013)

===============================================

Quiz Answer

22.12.2012
 
A Battery Care Function - Charging Level

A Battery Care Function - Charging Level

Some notebooks have now the battery care function. This function saves the battery life and increases the life-span by not charging the battery to the full.

In a normal notebook use, if you stay on AC-power for long time, you may save the battery by low level charging. If you stay outside a lot, you may decide to change the charge to full 100% again.

The same idea may be used for the lithium battery applications as well. The same logic is applied for LiFePO4: the lower the charge/discharge cycle, the longer the life-span.

19.12.2012
 
Customer Reference: The Calamar Project

Customer Reference: The Calamar Project

A light-weight electric vehicle project with LiFePO4 batteries.

17.12.2012
 
WINA Lithium Battery - more products - more photos

WINA Lithium Battery - more products - more photos

Check the update of the photos + the information at our web pages

http://www.ev-power.eu/WINA-30Ah-100Ah/

17.12.2012
 
A simple solution to protect against short-circuit

A simple solution to protect against short-circuit

We strongly recommend to have all instruments and tools fully insulated against accidental short-circuit.

16.12.2012
 
Making your own LFP battery

Making your own LFP battery

The photo shows a 12V LFP battery made of 4 cells stapped together. It is designed to serve as a backup battery for starting car in cold winter weather.

13.12.2012
 
The CALB Cells tested by TUV

The CALB Cells tested by TUV

The TUV has confirmed the compliance of the CALB cells to meet the EN62133 standards.  Download the TUV test results here.

Buy the CALB (China Aviation Lithium Battery) cells on-line at EV-POWER.EU.

12.12.2012
 
The original Winston LP12V80AH battery - after 3 years at 98AH!

The original Winston LP12V80AH battery - after 3 years at 98AH!

The photo shows the LP12V 80AH battery produced by Winston (ThunderSky) in 2010. After 3 years of continueous use it gives 98 AH (!) of real capacity. After the warranty period, the battery was modified by the user to get access to each cell and to monitor the voltage of the cells, using the CellLog8. 

What can be said?  It seems better than “ideal dream”. But it is not a dream, it is the reality of the LFP technology.  With LFP cells energy storage is possible!

12.12.2012
 
Home Electric Energy Storage Project

Home Electric Energy Storage Project

We are now working on a testing installation of a Home Electric Energy Storage (HEES) Project with 5kWh battery bank and 1kW power to grid.  We will keep you informed about the project at the blog pages.

12.12.2012
 
Proper Fusing is Vital for LFP Safety

Proper Fusing is Vital for LFP Safety

We remind all customers to apply proper fusing for any DC power installations.  The fusing and/or DC circuit brakers will limit the risks of serious accidents in case of battery DC short-circuit.

09.12.2012
 
LFP 1000AHC - 3.2 kWh of energy in one cell

LFP 1000AHC - 3.2 kWh of energy in one cell

The LFP1000AHC is the largest capacity cell in our offer at www.ev-power.eu.  This cell is designed for the energy storage solutions.

http://www.ev-power.eu/Winston-400Ah-1000Ah/WB-LYP1000AHC-LiFeYPO4-3-2V-1000Ah.html

09.12.2012
 
The large capacity cell by Winston

The large capacity cell by Winston

The large capacity cells produced by Winston Battery remain the most favorite products for energy storage solutions and for large battery packs.

http://www.ev-power.eu/Winston-160Ah-300Ah/

http://www.ev-power.eu/Winston-400Ah-1000Ah/

03.12.2012
 
BMS123 - Current and Fuel Meters

BMS123 - Current and Fuel Meters

With these analog meters you can get an easy indication of the batery capacity and the output current.

http://www.ev-power.eu/BMS123-System/

03.12.2012
 
Check the BMS123 manual

BMS123 - Components of the system

The BMS123 system contains these components: the Main Controller, the Current Sensor, the Cell Modules.

Check the BMS123 manual
http://www.ev-power.eu/docs/pdf/BMS123_Manual_v1_0.pdf

Download the BMS123 software
http://www.ev-power.eu/docs/bin/Setup123BMS_v1.2.0.zip

03.12.2012
 
BMS123 - BMS Main Controller

BMS123 - BMS Main Controller

The photos of the BMS123 Main Controller and the Current Sensor.

http://www.ev-power.eu/BMS123-System/

02.12.2012
 
Improper installation causing terminal overheating and cell damage

Improper installation causing terminal overheating and cell damage

The photo shows a cell with a damaged terminal. The improper installation left some dirt and high resistance on the terminal connector flat area. The high currents cause over-warming and further increase of the resistance. The result is complete damage of the cell by terminal overheating.

02.12.2012
 
deSpyder - an EV Porsche Replika with Lithium Power

deSpyder - an EV Porsche Replika with Lithium Power

Check a reference project for a high-power EV using the LiFeYPO4 cells from Winston Battery.

 

29.11.2012
 
Variety of LFP cells

Variety of LFP cells

Various cells from various producers. The same or different?  Of cause there are some differences but because all the cells are produced according to the international standards, the actual differences are very small and all the cells meet the standards and the requirements.

29.11.2012
 
BMS123 - Installation progress

BMS123 - Installation progress

Rough wiring of the BMS for testing purposes

25.11.2012
 
Connecting LP12V batteries - serial and parallel

Connecting LP12V batteries - serial and parallel

We always recomend to make paralel connection first before making the serial connection. With parallel connection the two (or more) batteries are managed (monitored) as one block.

25.11.2012
 
Installation of the BMS123 modules

Installation of the BMS123 modules

See detailed photo of the installation of the BMS123 cell balancing modules.

23.11.2012
 
The LP12V20AH battery with improved terminal connectors

The LP12V20AH battery with improved terminal connectors

For starting applications you can improve the performance of the LP12V20AH battery by using more robust copper terminals.

19.11.2012
 
New small size WINA cells

New small size WINA cells

We have added the 8AH and 15AH models. Why to choose WINA? High power density, high performance, robust aluminum case, long life span. Test these cells and see for yourself.  

05.11.2012
 
Overview of the Cell Terminal Connectors and the Compatilibity Guide

Overview of the Cell Terminal Connectors and the Compatilibity Guide

Check the PDF with the dimensions of the terminals connectors for the battery cell models. Download here.

03.11.2012
 
Overview of the Connection Possibilities for SMA Island 5048

Overview of the Connection Possibilities for SMA Island 5048

Examine the details of the management inputs for controlling the SMA 5048 by external equipment. Check the PDF file here.  (See also the complete SMA Island 5048 manual.)

03.11.2012
 
LiFePO4 Cell Test Data - abuse and extreme conditions

LiFePO4 Cell Test Data - abuse and extreme conditions

The abuse test data show the results of hazardous situations and lithium cell extreme conditions: Overcharge by 1C and 2C current, overdischarge test by 0.5C current, cell damage – short Circuit, cell crush Test (50% of the cell), nail penetration test (3 mm), high temperature (150*C and 175*C), temperature performance, cycle life (0.5C).

Check the data at the PDF file.

These tests show that the LiFePO4 technology is really safe and can be used without worries about the danagers.

01.11.2012
 
The BMS 123 CBU modules mounted

The BMS 123 CBU modules mounted

We are installing the demo instalation for the BMS 123 system to demonstrate the function for the GridFree energy storage solutions. Keep checking our blog for more details coming.

27.10.2012
 
Customer project reference: Solar offgrid installation with WB cells

Customer project reference: Solar offgrid installation with WB cells

Harvesting the solar power from the photovoltaic modules 240Wp -12 pcs, 2880Wp. Storing energy into Winston battery LYP200AHA, 32pcs, connected in 48V/400Ah battery system. Making the 230V AC network using SLI inverters 1500VA, 4pcs, 6kVA max power.

19.10.2012
 
Replacing OPTIMA Yellow 65AH with 60Ah Winston LP12V60AH

Replacing OPTIMA Yellow 65AH with 60Ah Winston LP12V60AH

The Chrysler Voyager (now Lancia Voyager) has the Optima Yellow 65AH starting battery. We have made replacement with Winston LP12V 60AH model.  The Optimal lead-acid has 28 kg. The Winston lithium battery has 12 kg. In cold weather, you can see the difference in starting the car immediatelly.

15.10.2012
 
Certified Container for Energy Storage

Certified Container for Energy Storage

This is a small size container with fire-proof certification to store lithium batteries. The outisde dimensions: 2200x1600, height 2445. The inside dimensions: 2040x1500, height 2200. Total weight 510 kg.  The approximate cost is EUR1200.

Contact us of you have the need for this solution.

07.10.2012
 
1MWh energy storage solution (ESS) - more photos

1MWh energy storage solution (ESS) - more photos

See the design of the ESS are outlined by the 3D planning software. Check the photo of the newly developed two-way inverter for the DC/AC intergration.

Check also the specification of the solution.

07.10.2012
 
1MWh energy storage solution (ESS)

1MWh energy storage solution (ESS)

In co-operation with our partners, we have supplied lithium cells for a project of 1MWh mobile energy storage solution. This project is scheduled to be completed in November 2012 in Budapest, Hungary. It is grid-tied solution to allow energy storage release and buffering to the 3x400VAC network at switching times of >0.001 second.

   ...more >>

07.10.2012
 
FAQ: RT-BMS power-on and settings after STAND-BY

FAQ: RT-BMS power-on and settings after STAND-BY

Question: At the general power on (+12V) all the contactors are connected for short time. Is it a normal operation?

Answer: Yes, this is a safety checkup of all contactors and signal lights. This is to confirm that all of these outputs are working properly.

This logic is the same in your car:  when you turn on the starting key in your car,  all important signal lights on the dash board will light briefly to confirm that the signalization is OK (like airbags, EPS, motor oil and other lights)

Question: After the power-on, the unit performs a sort of scan of the system. The numbers of 01.00 to 01.63 (02.00 to 02.63, and 03.00 to 03.63) was displayed. This behavior is also present if we set a number of 4 cells on the system. Is it a normal behavior?

Answer: Yes, this is normal. After power-on the Master unit scans all possible combination (3x 64) to locate any CBU on the data line bus. This is for safety reason to confirm that the communication with all CBU is regular. Also it can help to locate any CBU that would be miss-addressed.

   ...more >>

30.09.2012
 
High Current Charging and Discharging Report for WINA Cells

High Current Charging and Discharging Report for WINA Cells

The purpose of the test is to verify the performance of the LiFePO4 cells in high
current discharge and charge conditions:

1) What are the discharge characteristics for 1C to 3C currents?
2) How will the individual cells perform under these tests?

Download the test report here.

30.09.2012
 
The summary of the technical specification for WN-models of LiFePO4 cells 

The summary of the technical specification for WN-models of LiFePO4 cells 

Check the specifications of the individual models:

The summary of the technical specification for WN-models of LiFePO4 cells, information in the PDF file WN36AH, WN50AH, WN72AH, WN100AH.

29.09.2012
 
The Test Report:  Comparison of the 36AH LiFePO4 pack with 12V/40AH SLA battery

The Test Report:  Comparison of the 36AH LiFePO4 pack with 12V/40AH SLA battery

The purpose of the test report is to show the specification of the LiFePO4 battery made of WN-36AH cells.

The advantages of the WN-36AH cells

  • professionally produced LiFePO4 cells
  • stability during high current discharge
  • the discharge with long flat discharge area (3.30V to 3.10V)
  • aluminum case for protecting the cell
  • no overheating or heat release during operation

Download the full test-report here

29.09.2012
 
Testing the WN LiFePO4 cells

Testing the WN LiFePO4 cells

Before insroducing new products we always make deep tests and examine the specifications of the products. This way our customers can be sure that the products will really meet the expectations and it will be a 100% and more quality solution.

Check our offer of the WN cells here!

28.09.2012
 
The EVKart project reference

The EVKart project reference

The technical university in Pilsen has been working on a EVKart project of a fully electric racing go-kart. It can reach up to 160 km/h without any noise, smell and dirty emissions.

28.09.2012
 
BOmobil - an EV project by Hochschule Bochum

BOmobil - an EV project by Hochschule Bochum

Check some details of a reference project using the LiFePO4 technology. See more photos on this page.

17.09.2012
 
Visit us at eCarTec 2012!

Visit us at eCarTec 2012!

Come to meet us at Munich – October 23rd to 25th. HALL 2D, booth 520. Right in the middle of the biggest automotive players. We will be showing the latest products and solutions for the DC power. Register at our web page to get the free ticket for the exhibition. We welcome all customers, fans and friend to see us and talk to us.

16.09.2012
 
The initial testing of the mFi technology by UBNT

The initial testing of the mFi technology by UBNT

The mFi is an easy machine to machine communication solution combining the proprietary mFi protocol with the LAN (IP network) access to the devices.

15.09.2012
 
The 134 kWh energy storage island system with integration to SMA invertors

The 134 kWh energy storage island system with integration to SMA invertors

Large capacity bank of the LiFeYPO4 cells is providing 134kWh storage system that works with a string of SMA invertors to give 80kW peak power.

Please contact us for details about this project.

15.09.2012
 
Mr. Winston Chung celebrating 14 years of hard work at Winston

Mr. Winston Chung celebrating 14 years of hard work at Winston

The Winston company (formerly Thunder Sky) management and workers gathered to celebrate the 14 year aniversary of the Winston company operation.  Mr. Winston Chung, the founder of the Thunder Sky group addressed the meeting personally. Fourteen years ago the Thunder Sky was the first company to start with large capacity lithium cells.  After 14 years it is still the No.1 in large prismatic lithium cells. 

12.09.2012
 
Plug-in Hybrid Refuse Collection Vehicle

Plug-in Hybrid Refuse Collection Vehicle

GWL/Power has supplied LiFePO4 Cells and the complete RT-BMS system to be used in France by SEMAT Company - ZOELLER Group, for their Plug-in Hybrid RCV (Refuse Collection Vehicle) with the Electrical Zoeller Lifter “E-Rotary”, on the PREMIUM “HYBRIS TECH” Chassis made by RENAULT TRUCKS. This hybrid RCV was presented at the “IAA” HANOVER 2012.

12.09.2012
 
Tons of LiFePO4 cells and batteries received

Tons of LiFePO4 cells and batteries received

After a period of delays, we have received a huge shipment of the LiFeYPO4 cells and batteries. Your orders will be processed soon. If you wish to place new orders, it is the right time now.

10.09.2012
 
The Drawings and the Diagrams for the RL709 Latching relays

The Drawings and the Diagrams for the RL709 Latching relays

(see pricing here)

10.09.2012
 
DC Power Latching Relay 100A, Coil 12V and 48V

DC Power Latching Relay 100A, Coil 12V and 48V

High current latching relay designed for AC and DC voltage with a maximum current 100A DC (at 48VDC) or 120A AC (at 250VAC). The advantage of the lachting relay is that there is no need for continueous powering of the operating coil.

The voltage of the operating coil is 12V or 48V DC. See our offer at EV-POWER.EU

   ...more >>

03.09.2012
 
More photos of the DC contactors

More photos of the DC contactors

The DC contactors have the auxiliary switching contacts on the top of the main DC contactor. Order on-line here: http://www.ev-power.eu/DC-Contactors/

02.09.2012
 
DC Contactor Specifications and Dimensions

DC Contactor Specifications and Dimensions

Check the dimensions and the parameters of the DC power contactors. These DC Contactors are designed for 6V to 80V DC.

See our offer here: http://www.ev-power.eu/DC-Contactors/

09.08.2012
 
FAQ:  Balancing, overcharging and over heating of the CBU modules

FAQ:  Balancing, overcharging and over heating of the CBU modules

Question: I have the RT-BMS installed on 16 cells. It seems to work OK. Only the balancing does not seem to be working properly. The voltage on some of the cells goes up to 4.00V and the CBU does not seem to control this.  The BMS will switch off the charger for some time, but the cells are not fully charged.

Answer: Please note that the balancing current of the CBU is maximal 5A for the standard version and maximal 10A for the continues to grow, it will signal the full stop of charging (BMS pin B5 – Charging MAIN).   The charging current needs to be reduced bellow the balancing currents of the CBUs to allow for the balancing of the cells without voltage increase.

   ...more >>

08.08.2012
 
GWL/Power visit to Sinopoly Factory in China

GWL/Power visit to Sinopoly Factory in China

GWL/Power representative made a visit to the new factory of the Sinopoly Group in China. We have recently added the Sinopoly products to offer offer. You can check and order the Sinopoly LiFePO4 models at our web on-line.

07.08.2012
 
High current peak discharge of 40AH LFP cells

High current peak discharge of 40AH LFP cells

The graphs show the discharge of 40AH LFP cells with 100 Amp and 500 Amp currents. These high current tests prove that the performance of the cells is very identical and that there is no defect of these cells.

21.07.2012
 
Lithium battery price to futher increase in 2013 and beyond

Lithium battery price to futher increase in 2013 and beyond

With the pricing of the chemical-grade in 2012, the price of the lithium cells and batteries continues to increase. The battery producers will starting adjusting the lithium battery pricing in the 2013 and for 2014 orders.

It is high time to get “some cheap” batteries now! 

18.07.2012
 
The information about the 48V DC power energy storage systems

The 48V DC systems are usually assembled using 16 LiFePO4 cells with nominal voltage of 3.2V. You can check the example of the voltage levels for such a system at these examples (2).

The 16 cells system has following voltage levels

  • Nominal voltage - 16x 3.2V = 51.2V
  • Maximal charge voltage - 16x 3.65V  < 58.4V
  • Minimal voltage under load - 16x 2.8V   > 45V

In order to maintain compatibility with the lead-acid systems, some customers prefer using only 15 cells of the LiFePO4.  The 15 cells system has these voltage levels.

  • Nominal voltage - 15x 3.2V = 48V
  • Maximal charge voltage  - 15x 3.65V  < 54.7V
  • Minimal voltage under load - 15x 2.8V   > 42V

For compatibility reasons with other products (chargers, solar chargers, etc)  it is preferred to use the 16 cell solutions.

An example of 10kWh system at 48V can be assembled using 200Ah cells.
16 cells x 3.2V x 200Ah = 10.24 kWh for energy storage

   ...more >>

14.07.2012
 
Specification of the LFC small size cells

Specification of the LFC small size cells

Please check the specification PDF with details about the 3AH, 5AH, 8AH, 10AH small size LiFePO4 cells.

Check EV-POWER.EU section: http://www.ev-power.eu/LiFePO4-small-cells/

12.07.2012
 
FAQ: Upgrading older BMS systems

Question: I purchased the RT-BMS from your company in 2009. I have a friend who purchased the BMS system from you in 2012. It is obvious that there are some key differences in the BMS system. It seems that my system has some bugs and problems.  How to solve these problems?

Answer: First thank you for using the RT-BMS system in your application. However, please understand this point: The BMS you purchased in 2009 was produced more than 3 years ago.  From that time till now, some major hardware (HW) improvements were made in the later HW revisions. Also the software (firmware) inside the units was upgraded significantly.  Even the managing software (for PC) was changed completely.

All this information about these updates was regularly published at our support pages. Special limited offers were provide back then:

We tell you honestly, that your version of the BMS is already outdated, no longer supported and can no longer reflect the improvements that were already done.

   ...more >>

07.07.2012
 
Depth of discharge (DOD)

Depth of discharge (DOD)

All battery manufacturers recommend to keep the Depth of Discharge (DOD) bellow the maximal limit of 100%. Ideally 80% DOD or less is recommended. The rule is quite simple: the smaller DOD the larger number of cycles. With 50% DOD the LiFePO4 cells may have well above 5000 cycles. However it is imporatnt to keep the DOD at the cetral part of the capacity range. If the DOD is not in the center of the capacity range, the cell performace may degrade faster.

As a matter of fact, since it is better to avoid deep cycle discharging, it seems to be better to charge as frequently as possible. It is better to “charge (to full) and drive” rather than “drive and charge (from null)”.  

30.06.2012
 
Example of discharge of 20Ah cells at 360A (18C)

Example of discharge of 20Ah cells at 360A (18C)

The graph shows discharge characteristics of 12V batteries using 20Ah cells at 360A. This high current is used to start the gasoline engine.

29.06.2012
 
Building a LiFePO4 battery - charging and initiation

Building a LiFePO4 battery - charging and initiation

Check a useful article published by one of our customers.

20.06.2012
 
An electric car using the LFP batteries for the traction.

An electric car using the LFP batteries for the traction.

09.06.2012
 
SOC vs Temp

SOC vs Temp

The State of Charge (SOC) versus Temperature (*C) for CALB 180AH cell. Check the test report data.

06.06.2012
 
EVBIKE generator tests

EVBIKE “generator” tests

We are testing the EVBIKE motor to work as an electricity generator.

06.06.2012
 
Overview of the technical specifications for the CALB cells

Overview of the technical specifications for the CALB cells

   ...more >>

06.06.2012
 
The new CALB CA180 model

The new CALB CA180 model

Check our offer of the new CALB CA180AH model.

06.06.2012
 
Detailed photo of the LFP20AH cells

Detailed photo of the LFP20AH cells

Check our offer of the prismatic cells and also other models of small capacity cells.

30.05.2012
 
FAQ: What is the chemical composition of the LFP cells from various producers?

Answer: The basic chemistry of all the cells is primarily the same. All LFP cells are using the same fundamental chemical process described as the LiFePO4 technology.  Though there may be some minor variations in the purity of the chemical materials, the functional performance of these cells is identical.

Some producers improve the performance of the LiFePO4 process by doping additional chemical elements. For example Winston Battery is using the rear earth mineral Yttrium. Check details about the „Enhanced-lithium-iron-technology“.

22.04.2012
 
Internal Resistance of the Winston Battery Cells

Internal Resistance of the Winston Battery Cells

Study the official document with the information about the internal resistance of the LiFeYPO4 cells produced by the Winston Battery.

Download PDF here

Check the explanation of what the internal resistance is together with a demonstration test.

22.04.2012
 
Winston Battery Operator Manual

Winston Battery Operator Manual

The official handbook for the operation of the LiFeYPO4 cells and batteries made by Winston (formerly Thunder Sky)

download here

22.04.2012
 
LiFePO4 block 12V batteries with PCM

LiFePO4 block 12V batteries with PCM can directly replace SLA 12V batteries in many applications.

The LiFePO4 with PCM have these key advantages:

  • Longer service life: 1000 cycles and beyond
  • Full capacity even at high speed discharge rates
  • Fast charging without overheating and gassing
  • Lower self discharge: just few percent in a month
  • Excellent life-span: service life of 5 years and more
  • Protection against over charge and deep discharge
  • Lighter in weight: 1/3 of the weight of the lead acid batteries
  • Green ecology: no acids, no lead, not toxic substances

You can now replace the lead acid (SLA , AGM or GEL) batteries with these modern LiFePO4 batteries and see the difference in the performance immediately!

The size is the same, the performance and service-life is much better!

   ...more >>

17.04.2012
 
New models of the PCM batteries

New models of the PCM batteries

Check the new models of the PCM batteries: LP12V25AHP, LP12V34AHP, LP12V42AHP in addition to the existing models: LP6V4AHP, LP12V7AHP, LP12V12AHP and LP12V17AHP. Check the PDF file with more details.

11.04.2012
 
RT-BMS Monitor Screen Demonstration

RT-BMS Monitor Screen Demonstration

   ...more >>

11.04.2012
 
Question: My mistake I discharged my battery pack very low voltage and the cells are misbalanced. I think the RT-BMS system does not work properly. What shall I do?

Question: My mistake I discharged my battery pack very low voltage and the cells are misbalanced. I think the RT-BMS system does not work properly. What shall I do?

Deep discharge:  please avoid the deep discharge of the battery pack at any case. You need to monitor the battery pack continually to protect against such deep discharge. You should stop using the pack when the voltage gets too low.  You should disconnect the pack from the load in case the pack will be left unattended for a longer period of time. You should never operate the equipment with no supervision.

RT-BMS operation:  the RT-BMS system CBU modules measuring input is powered from the cell voltage. If the voltage of the cell drops too low, the CBU unit does not work properly. See the BMS instruction document, page 2: „Operating voltage of the measured cell min 1.8V. max 5.0 V“.  In fact the BMS units (CBU modules) may not work reliably under 2.0V! The CBU will stop working with 1.8V and less.  The BMS cannot report correct values for these under-voltage cells.

   ...more >>

11.04.2012
 
The 12V batteries with PCM not to be used for traction applications!

The 12V batteries with PCM not to be used for traction applications!

IMPORTANT: Note that the 6V/12V batteries (with PCM inside the housing case) are not designed for high current drains, such as in traction apllications, scooters, motocycles, high power backup devices (UPS) or for starting batteries.

Due to the limitations of the PCM boards, the optimal discharge current is 0.5C (e.g. 6A for 12Ah model), the maximal discharge current is 1C (e.g. 12A for 12Ah model). The 6V/12V batteries with PCM will become damaged if used with too high currents. The warranty claims cannot be applied to such types of damages.

11.04.2012
 
RT-BMS Monitor unit released - product and manual information

RT-BMS Monitor unit released - product and manual information

RT-BMS data monitor unit with a touch display (for RT-BMS Master unit).  Designed to read and display data from all software versions of RT-BMS Master unit starting from HW version 2.0. The BMS Master Unit is connected to the board using a special I2C to RS232 cable.

In addition to the display of the data, the monitor can be configured to save gathered data from the BMS to a CSV file to be downloaded to your PC.

Check the RT-BMS Monitor documentation on-line.

 

02.04.2012
 
Check these FAQ published on our blog to understand the initial battery charging

Check these FAQ published on our blog to understand the initial battery charging

We remind all users of the LFP cells and LP batteries that the cells and batteries MUST be charged to full voltage level BEFORE assembling into a pack and before starting to be used.  source

The new 3.2V LFP cells delivered from the warehouse are partially charged. However before the first use, it is essential to charge each cell to full capacity. source

The cells must be charged individually to full voltage level (typically 4.0V) before assembling the battery pack. This way the cells will be fully charged and balanced before the first use of the battery pack and there will be no need to balance the cells using the BMS with balancing. source

   ...more >>

01.04.2012
 
Battery Charging Guidelines as published by Sinopoly

Battery Charging Guidelines as published by Sinopoly

The charging diagrams (in PDF file) show the steps of the charging process for the best state-of-art charging process.

25.03.2012
 
Using LiFePo4 for off-grid solar application with CellLog8 monitoring

Using LiFePo4 for off-grid solar application with CellLog8 monitoring

Check the “Solar Power - A Bodger’s Guide” blog to see the application of the LFP cells for solar applications. 

15.03.2012
 
GWL and CALB to increase the market share in European lithium sales

GWL and CALB to increase the market share in European lithium sales

Prague, March 12th, 2012: China Aviation Lithium Battery (CALB) announced the plans to increase the distribution share for the lithium battery products in the European Market. 

Following the visit of the leading European distributor GWL/Power, the CALB deputy manager Mr. Rong Fang summarized the plans for CALB to expand on the international sales in Europe: „We are looking for partners, we are looking for strong partners, we are looking for advanced partners who will increase the value of the CALB business.“

GWL/Power has become CALB’s key distribution partner with stocking area of 3800 m2.  At present GWL offers the well-reputed SE series of the CALB models. Starting from April, the new models of the CA series will also become available to the European customers.

   ...more >>

14.03.2012
 
The new on-line shop of GWL/Power Europe!

The new on-line shop of GWL/Power Europe! 

Starting from March 13th, 2012 we are improving our on-line web business system to a new web shop with many new user functions.  More goods and more products from growing number of suppliers were added to the on-line ordering system. We have checked-up to the pricing and updated the products range.

Be sure to order on-line:  During the month of March you can get an additional discount of up to 3% for your new on-line orders.

04.03.2012
 
FAQ:  What is the charging voltage of the 12V battery?  16V or 14.4V?

FAQ:  What is the charging voltage of the 12V battery?  16V or 14.4V?

Question: Some web pages and the GWL blog says that the final voltage of the charge for 12 LP battery is 16V. But some other pages and some charger specifications give information about charging to 14.4 ~ 14.6V. What is the difference?

Answer: The maximal charge voltage for the LiFePO4 technology is 4.00 per cells (16.00V per battery). This is the recommended charge voltage for the initial charging to balance all the cells to the same full level.  Check additional information at this post.

04.03.2012
 
Making orders from GWL/Europe or from China. Which to choose?

 

Making orders from GWL/Europe or from China. Which to choose?

Get details about the difference when ordering from GWL and from China.

18.02.2012
 
FAQ: How should the PCM battery be protected against improper use?

FAQ: How should the PCM battery be protected against improper use?

Even though the PCM battery does contain the PCM board (Protective Circuit Module), the purpose of the PCM board is not to be used instead of the proper battery protection. The battery with the PCM  needs to be protected as any other lithium battery.

Proper fusing – it is necessary to protect the battery against accidental over discharge by a proper fusing.  Using a proper fuse protects not only the battery but also it protects the equipment, as the fusing does not allow too high currents to pass through the device in case of a failure. You should always install a proper fuse to protect the battery. (For example for a 12V/100W equipment you should install a 10AMP fuse. For the 12V batteries it is easy to use the 12V fuses manufactured by the automotive suppliers.)

   ...more >>

14.02.2012
 
A BMS-Master with heavily burnt components

A BMS-Master with heavily burnt components

… well, we all learn by mistakes. Such mistakes however are not covered under the manufacturer’s warranty for the product’s performance and specifications.

14.02.2012
 
PV panels for every roof! Become GridFree!

PV panels for every roof! Become GridFree!

The small PV installations and off-grid solutions and hybrid-grid solutions are getting more and more popular. The LFP batteries are proving as long-term energy power backup solutions. We are getting ready to launch some new and exciting products. Wait for more to come!

   ...more >>

12.02.2012
 
LiFePO4 cells with aluminium case

LiFePO4 cells with aluminium case

We are testing new models of LiFePO4 cells with iluminium cases. A new generation of LiFePO4 cells with improved high current performance and excellent thermal performance. Check our discharge and charge tests.

07.02.2012
 
High Current Charging and Discharging Report for Lithium (LiFeYPO4) Cells

High Current Charging and Discharging Report for Lithium (LiFeYPO4) Cells

How will a LiFeYPO4 cell behave after 13000 cycles of high speed charge and discharge?  Will the battery overheat or have any other malfunction? Will the battery age and lose its capacity?

Study the results in the The LiFeYPO4 cell test data after 13,000 cycles

31.01.2012
 
Can a battery be charged when being discharged?

Can a battery be charged when being discharged?

Answer:  If the charging current is higher than the discharge current, it is possible to charge the battery when being under load. When charging the charging current will be first consumed by the load and only the current in extra will be used to charge the battery: Example:  the discharge current is 4 Amps, the charging current is 5 Amps. The effective charging for the battery will be the difference: 1 Amp.

27.01.2012
 
LP 12V/20A – customer reference – 530 cycles

LP 12V/20A – customer reference – 530 cycles

I am using LiFePO4 batteries for 1.5 year in a cyclic use. The energy drop after 530 cycles is in average about 2 percent. The batteries have always had higher capacity than given by the manufacturer. At this time they still have higher capacity than the nominal value - in average 110%. I am using 12V/20Ah batteries. I have altogether 50 batteries. The weakest of them still has 21 Ah of useable energy. To get ideal performance, it is best to keep the voltage of each cell in between 3.0 to 3.5V. When voltage is dropping bellow 2.8V the battery may become misbalanced and the cells may be damaged.

21.01.2012
 
Another cell strapping photo! Enjoy.

Another cell strapping photo! Enjoy.

21.01.2012
 
FAQ: Replacing a defective cell with a new cell

FAQ: Replacing a defective cell with a new cell

Question: I have bought 50 lithium cells. After 3 years, I have found out that one or two cells are defective. How can I replace the defective cell?

Answer: Generally said you can replace a defective cell in a string of LFP cells with a new cell of the same capacity (or higher capacity).  As the new call has full capacity performance, the new cell will not influence the performance of the whole pack. Some customers decide to buy some extra cells to have them on hand in case of a cell failure. However in order to keep these extra cells fresh over a period of many years, it is necessary to charge and discharge the extra cells from time to time.

Note: most cell failures are direct results of deep discharge, over charge or improper balancing. We strictly recommend avoiding such situations to keep the long lifetime of the cells.

14.01.2012
 
The difference between Li-ion and LiFePO4 - marking of the products and documents

The difference between Li-ion and LiFePO4 - marking of the products and documents

Question: I have ordered the battery and charger from your company. Your specification says it is the „LiFePO4“ battery and charger. Now, I have received the shipment and I feel puzzled. The invoice form the Customs office says: Tarric Code: 8507 80 30 Lithium-ion cells.  The packing list from TNT cargo mentions: Material Safety Sheet for Li-on cells and batteries. The box of the cells has the labeling „Li-on battery“.  Even the charger has the text: “Charger for Li-ion battery”. I am afraid you sold me some other cells not the LiFePO4. Is it Li-ion or LiFePO4? Why is LiFePO4 not mentioned in these official documents and on the products?

Answer: Please be sure that we really sell the LiFePO4 technology as mentioned at each of the product or at the cell, at the battery and the equipment specification. We are testing all products that we sell to be sure that the real performance meets the specifications. The products you received are li-on cells with LiFePO4 chemistry.

   ...more >>

09.01.2012
 
GWL Battery Lab Photos

GWL Battery Lab Photos

See some photos behind the scenes from our work in the GWL battery lab.

09.01.2012
 
Size of the terminal connectors for 100AH cells

Size of the terminal connectors for 100AH cells

Product code LFP100-CON

05.01.2012
 
Welcome in 2012!

Welcome in 2012!

We hope to increase our technical support and services. We plan to add new products, battery brands and models. We are looking forward to co-operation with our customers!

27.12.2011
 
Assembling a 48V/20Ah battery pack for an electric bike with a SBM module to manage and protect the cells.

 

Assembling a 48V/20Ah battery pack for an electric bike with a SBM module to manage and protect the cells.

26.12.2011
 
FAQ: balancing of the cells at the inital charge

FAQ: I have assembled a new battery pack. I have a BMS that balances with 2A of heat discharge on each cell. I keep charging my cells for many hours already and some cells are already full and some cells are not charged yet. What is the problem?

Answer: Please follow the lithium battery operation instructions closely:  the cells must be charged individually to full voltage level (typically 4.0V) before assembling the battery pack. This way the cells will be fully charged and balanced before the first use of the battery pack and there will be no need to balance the cells using the BMS with balancing. (Additionally to the first installation, we recommend to checking the cells of the battery pack from time to time and making the full balancing of all the cells, by means of the individual charging.)

Note: Concerning the balancing using the heat dissipation (over the BMS modules): keep in mind that it takes a lot of time to balance the cells this way. If you have 300Ah cells with +/- 20% misbalance, you need to balance up to 40 Ah of capacity. With 2 A balancing current, you may need 20 hours to finish the balancing. Even more, you waste a lot of energy that will be discharged at the cells that are already fully balanced. That is why we do not recommend to balance the cells this way.

11.12.2011
 
Never apply excessive force to the terminal connectors!

Never apply excessive force to the terminal connectors!

Applying excessive force to tighten or release the bolts of the terminal connectors can cause whole terminal to move (rotate). The result is a damage of the internal structure of the cell that cannot be repaired. No warranty can be applied for such kind of the cell abuse.

08.12.2011
 
Energy storage solution using LFP with 3 phase invertors

 

Energy storage solution using LFP with 3 phase invertors

A customer solution using the 3 phase invertors to power a system from an enery storage pack using the LFP cells. 

03.12.2011
 
The Winston Battery Safety Information

The Winston Battery Safety Information

Download the Winston Battery Safety Information PDF.

26.11.2011
 
Discharge of 90AH and 100AH batteries - Test Report at 220A (2.2C)

Discharge of 90AH and 100AH batteries - Test Report at 220A (2.2C)

The test report shows the discharge characteristics of Winston 90AH, Winston 100AH, CALB 100AH at 220A discharge currents (2.2C). Download the test data here (XLS 1.3 MB)

26.11.2011
 
LFP 200AH and RT-BMS installation in Opel Corsa EV convertion

LFP 200AH and RT-BMS installation in Opel Corsa EV convertion

Check the reference photo supplied by our customer. You can see the installation of 200AH LFP cells and the RT-BMS system.  Note the size of the cooler for the CBU modules (10A High Power variant is used)

26.11.2011
 
The PCM circuit of the LFP batteries cannot replace proper fusing

The PCM circuit of the LFP batteries cannot replace proper fusing

Recently there were several cases of customers who damaged the LFP batteries with the PCM by over current or short-circuit.  As any batteries, the batteries with the PCM protective board need to be fused by a proper size fuse. In case of an accidental short-circuit connection, the fuse will protect the battery against high current that can cause the damage the PCM board and the whole battery.

The photo shows one instance of improper use of the LFP battery with the PCM. The two places on the battery connector plus pole prove the repeated over-current that even melted the connector.

The damage by over-current is not covered by manufacture warranty and there is no way to repair a battery that was damaged this way.

11.11.2011
 
Discharge of 90AH and 100AH batteries - Test Report at 102A (1C)

Discharge of 90AH and 100AH batteries - Test Report at 102A (1C)

The test report shows the discharge characteristics of Winston 90AH, Winston 100AH, CALB 100AH at 102A discharge currents (1C). Download the test data here (XLS 1.6 MB)

06.11.2011
 
Discharge of LFP based on temperature

The winter is coming: The discharge voltage for LFP cells in relation to the cell temperature.

05.11.2011
 
FAQ: Charging individual cells using the regulated (laboratory) power supply

 

FAQ: Charging individual cells using the regulated (laboratory) power supply

Many of the laboratory power supplies allow charging of the individual cells. Using such a regulated power supply is a suitable method for performing the initial charging or for the balancing of a single cell in a battery pack (by means of charging to a fixed voltage level).

There are usually 3 steps to follow:  1) set the target voltage (open voltage) – without the connection of the battery (3.65 at the picture), 2) start charging and set the current to be used (3.0 A at the picture), 3) when the charger reaches the target voltage – it usually starts to reduce the charging current until a low value. (3.66 V reached at 0.04A). It is a time to stop charging and disconnecting the charger.

05.11.2011
 
Training: Lithium Battery Technology Expert – October 2011

 

Training: Lithium Battery Technology Expert – October 2011

Photos from the one-day training that helps you to become the lithium battery expert and to understand the advantages of the lithium battery technology. The training consists of a block of lectures together with seminars, question and answers sessions and practical labs. These labs will help you to assemble your own battery pack and practice proper charging and discharging.

   ...more >>

05.11.2011
 
GWL Power Promotion Leaflet at eCarTec 2011

 

GWL Power Promotion Leaflet at eCarTec 2011

05.10.2011
 
Visit us at eCarTec Munich - October 18 - 20

 

You are warmly invited to visit the GWL/Power stand at eCarTec 2011!

Hall A6 - STAND 603   - see our details at the Exhibitor database

Please register ON-LINE (using the form bellow) to get a FREE Ticket from GWL to come to meet us.

(The dead-line for processing the requests is October 14th, 2011)      


The offer of free registration was closed on October 14th at 12:00.

If you wish to come to eCarTec, please purchase the regular ticket on-line at http://www.ecartec.de/index.php?id=4

Thank you!

02.10.2011
 
Harvesting the power of the sun

The charge graph
Two 217Wp panels
The battery pack

Harvesting the power of the sun

We have set up a new configuration to test the solar charging of LFP batteries. Two solar panels (217Wp each) are in a serial string to charge a 48V/90Ah battery pack made of 4 pcs of LP12V 90AH batteries.

During a sunny day in October, we are able to gain more than 2 kWh of energy from the 2 panels. (38Ah at 53V = 2kWh)

Our tests have a multiple purpose: to test the solar charging, to examine different solar controllers, to study the charging of the LFP batteries and finally to make a working solution to disconnect from the grid for ever.

   ...more >>

02.10.2011
 
Mounting cells using the strapping belts

Mounting cells using the strapping belts

Check more details here….

19.09.2011
 
Replacing the SLA batteries

I want to replace the lead acid 12V 100Ah stating battery. Which LFP model can I use?

Answer: The performance of the LFP batteries concerning the starting current is excelling the performance of the SLA (lead-acid) batteries. Our tests and the tests of our customers show that the LP12V 40Ah battery can replace any SLA starting battery (even the 100AH, or 150 Ah models). Even big diesel machines can be started from the LFP battery at very cold weather.

For long term use and massive deployment, we suggest to make testing for each application to make sure that the replacement LFP battery will work properly for long time.

18.09.2011
 
battery quality, the new 12V LP models

What is the real experience with LiFePO4 batteries?

Answer: The Winston Battery (formerly Thunder Sky) has been producing the LiFePO4 batteries since 2004. The first large volume customers were from the USA. These American customers have been using the LFP batteries from some 5 ~ 6 years with full satisfaction. (Even though there were some problems with the quality of the cells from some of the early production batches.)  It is important to note that over the years the technology has been developing. The new LiFeYPO4 technology is much more stable and production quality also continues to grow.

FAQ: I purchased a new LP 12V battery. Why is the battery different from the model I purchased several years ago?

Answer: The original Thunder Sky 12V LP batteries used to have electrochemical balancing (with a floating electrolyte). There were produced from 2007 till spring of 2009. Later versions contained individual cells with mechanical separation. The production of the original LP batteries was stopped in 2009. The news models (40Ah, 60Ah, 90Ah) are produced using individual single cells that are selected in the factory to match the performance and capacity.

13.09.2011
 
Training: Lithium Battery Technology Expert – October 2011

Training: Lithium Battery Technology Expert – October 2011

The training takes place on October 7th, in Prague, Czech Republic. The training is limited to 20 persons per one-day. Please place your request first to get a confirmation.

Become the expert in battery technology! Get the know-how in the most progressive field of energy storage. The one-day training will help you to understand the advantages of the lithium battery technology. You will learn the details about the battery pack configuration and management. You will learn how to operate a BMS system. The training consists of a block of lectures together with seminars, question and answers sessions and practical labs. These labs will help you to assemble your own battery pack and practice proper charging and discharging.

See more details here at EV-POWER.EU.

08.08.2011
 
Charger max voltage adjustment

I have a charger for 16 cells (POW48V30A/BMS). However I am using only 14 cells. Is it possible to adjust the output voltage of the charger?

Answer: Please note that the charger has two operating modes: the automatic mode and the BMS mode. In the automatic mode the charger will charge automatically till the full voltage (Vmax) is reached. There is no way for the user to change the Vmax voltage.  In the automatic mode you need to charge the exact number of cells as given by the type of the charger.

However in the BMS mode, the charging can be stopped or the charging current reduced using the BMS connector for managing the operation of the charger. This means if you have a BMS system that can control the charger, you can use the BMS decide when to stop charging. This way you can charge only 14 cells using the charger originally designed for 16 cells.

HOWEVER: We strongly recommend only to use the charger that has the voltage setting corresponding to the total voltage of the battery pack! In case of a failure of the BMS or in case of a problem with the communication, the charger will be in the automatic mode and it will charge the cells to the full voltage, despite the fact that the number of cells is lower. This will result in over-charge, possibly even burning the cells and a complete distruction of the cells. This is a serious WARNING!

   ...more >>

08.08.2011
 
FAQ: charging multiple 12V batteries

FAQ:  Can I charge multiple 12V batteries in series at the same time with one charger?  (i.e. 2 batteries for 24V, 3 batteries for 36V, etc…)

Answer:  Yes, it is possible to charge a battery pack consisting of multiple 12V batteries in series at the same time using one charger. However following needs to be observed:

1) The initial charge – you need to charge all the 12V batteries individually to full voltage level BEFORE you start using them together as a pack.

2) We strongly recommend to use some kind of management to make sure all the batteries are working within the proper operating voltage levels.  For example the Akumon may be used to monitor the status of the batteries.

Additionally we remind the need to observe the general instructions concerning the use of the 12V batteries.

27.07.2011
 
What is the recent price development for the lithium batteries?

What is the recent price development for the lithium batteries?

Answer: The demand for quality lithium batteries is growing. However only few producers can manufacture high capacity cells with guaranteed quality at good price. This means that the demand is increasing. When demand is increasing the price is increasing as well.

Additionally the costs of the raw materials (the chemical products and metals) are growing rapidly. This is another key reason the price of the batteries is growing high. The lithium batteries are mainly manufactured in China. The production costs in China are as well increasing: labor costs increase, the energy and transportation fee increase, the local government fees and taxes increase.

The conclusion is simple: the price of the lithium batteries will be growing.

20.07.2011
 
FAQ:  Battery deeply discharged – what to do?

FAQ:  Battery deeply discharged – what to do?

By mistake I have deeply discharged the 12V LP battery.  When I discover this situation, the voltage of the battery is < 1.5 Volts. How can I restore the battery?

Honestly, there is no way to restore the LP/LFP cells and batteries if there were deeply discharged. (Bellow 2.5V per cell or 10V per 12V battery.) If the battery is deeply discharged the internal structure of the cells is damaged. There is no way to get the battery back. The battery must be replaced with another battery.

Trying to charge this kind of empty battery will only result in even bigger damage and the battery will swell and release the gases!  Never try to “correct” the problem by swift charging!

The only option is to disconnect the battery and wait for some time (hours/days) to see if the voltage returns back to the minimal level.  If the voltage returns by itself, there is still hope that such battery may be charged. However this charging must be done with very small currents (0.1C or less) and the charging must be monitored.  If the voltage does not return and stays low, the battery is dead.

19.07.2011
 
FAQ: “Sudden” battery discharge

FAQ: “Sudden” battery discharge

I have bought a several of LFP cells and made the pack with them to replace the lead-acid battery in my houseboat. The LFP battery was working great and it gives much more capacity than the lead acid. However after several weeks of usage, I came back after the weekend and I found out that the battery is completely discharged. Why this happen?

Please note that unlike the lead acid batteries, the LFP batteries will be completely damaged if you discharge them bellow the minimal voltage (usually >2.5V per cell, or bellow 10V for 12V battery). This may happen if you have some equipment that takes the power from the battery continually. Maybe you simply forget some light or some equipment „on“, and after few days the battery is deeply discharged and damaged forever.

The example:  12V 90AH battery is connected to houseboat with alarm. This alarm takes only 5W of power (12V 0.4A). If the battery has 70% charge, the alarm will discharge the battery in about 150 hours, that is 6 days. If you have some equipment with higher power consumption, the discharge will be much faster, even perhaps less than one day.

   ...more >>

19.07.2011
 
Short cutted cell, no fire, no explosion

Improper packing of additional mounting hardware can cause a severe energy/heat discharge. The metalic parts can make the short-circuit of the cell terminals.  Never allow the terminals to be in short-circuit.

10.07.2011
 
GWL/Power team is using EV cars

GWL/Power team is using EV cars

Two of our CityStromers that are used on daily bases - both for the ordinary driving and for testing of the EV power solutions.

10.07.2011
 
CE declaration of conformity for the Winston Battery products

CE declaration of conformity for the Winston Battery products

10.07.2011
 
EVKart - Electric Racing Cart - another photo

EVKart - Electric Racing Cart - another photo

10.07.2011
 
EVKart - Electric Racing Cart

EVKart - Electric Racing Cart

10.07.2011
 
GO-Electro VW Squareback (1969 VW Type3)

GO-Electro VW Squareback (1969 VW Type3)

Another reference project of one of our customers. (Courtesy of http://www.go-electro.nl/ )

26.06.2011
 
You must charge before the first use!

You must charge before the first use!

We remind all users of the LFP cells and LP batteries that the cells and batteries MUST be charged to full voltage level BEFORE assembling into a pack and before starting to be used.

For the 3.2V cells, the full charge voltage level is 4.00V and the charging is the 12V LP batteries)

Even in simple installations, it is important to make the first charging. Example: when assembling a 48V pack using 4 pieces of 12V batteries, it is very important to charge all batteries to the same voltage (16V) before assembling the whole pack.  Only after the batteries have been balanced to the same voltage level, it is possible use them as a pack and to charge the whole pack together using the 48V charger.

Please remember:  FIRST CHARGE, THEN USE!

04.06.2011
 
New shipment of the batteries now on stock!

New shipment of the batteries now on stock!

We have received another container shipment of the batteries. Be sure to book your order fast.

04.06.2011
 
Charging 208 pcs of LYP40AH cells for EV scooters

Charging 208 pcs of LYP40AH cells for EV scooters

We arrange the batteries to make a 48V 520AH battery pack and we charge with 48V 150A charger.

01.06.2011
 
The photo of a damaged 12V battery

The photo of a damaged 12V battery

This photo shows the results of a severe battery abuse and following dissambly. You can see that the LiFePO4 is a 100% safe batery technology: no fire, no explosion, no dangerous acids, gases and chemicals.  (source)

30.05.2011
 
Simple solar solution for off-grid applications

Simple solar solution for off-grid applications

This is our demonstration panel for simple solar solutions based on the 12V LP batteries. Check with us if you need such solutions.

22.05.2011
 
Testing Solar-charge controllers with LP batteries

Testing Solar-charge controllers with LP batteries

Sample 1:  STECA SOLARIX MPPT 2010

This is a Maximum Power Point Tracking (MPPT) solar charge controller. It works perfectly. It gets the maximal power from the solar panel. The ideal peak reached was 200W of power input from 217Wp solar panel. The average solar input was 130W to 150W (from 217Wp panel during a sunny day in Prague, Czech).

Sample 2: PHOCOS CIS20

This is a Pulse-width modulation (PWM) solar charge controller. This controller will limit solar panel output voltage according to the battery voltage.  It is not suitable to be used with the high voltage FV panels (e.g. our 217Wp panel with max 36V). It is designed to be used with the so called “12V” solar panels.

The ideal peak reached was 140W of power input from 217Wp solar panel. The average solar input was 80W to 90W (from 217Wp panel during a sunny day in Prague, Czech).

   ...more >>

15.05.2011
 
The demonstration of battery overcharge

The demonstration of battery overcharge

The analysis of the RT-BMS data log supplied by customer:  Cells #3 and #6 were overcharged, as the voltage reached above 4.0V. These cells are already fully charged. It is necesarry to balance these cells untill the voltage level of all the cells in the battery pack reaches the same level.

Suggestion:  it is extremely important to balance all the cells to the same voltage level (4.0V) at the beginning of the usage of the battery pack.

14.05.2011
 
Winston Battery - cell dimensions

Winston Battery - cell dimensions

There are some changes in the dimensions of the LFP (LYP) cells as offered by Winston Battery. There is a difference in the sizes of several models against the previous models offered under the ThunderSky name.

Check the PDF file to see the differences in the dimensions. Download here.

04.05.2011
 
Testing the CBM performace

Testing the CBM performace

We tested the CBM boards before releasing them to our customers. You can see the voltage level of the 3 cells (on the left side) kept bellow 3.6V, while the right cell is not ballanced and the voltage increases above 3.9V.

04.05.2011
 
CBM - Cell Balancing Module - detailed photo

CBM - Cell Balancing Module - detailed photo

04.05.2011
 
Cell Balancing Module (CBM) - easy installation

Cell Balancing Module (CBM) - easy installation

The photo shows a four-cell testing pack with CBM installed. On the right there is a single CBM - balancing up to 1.7A. On the left, there is a cascade of 3 CBMs that increase the balacing current to up to 5A (3x ~1.7A).

02.05.2011
 
The need for simple mobility - EV Tricycle

The need for simple mobility - EV Tricycle

While the official vehicle manufacturers are ever delaying the coming of the EV vehicles, there are many simple mobility projects that go ahead with the EV solutions. (Link)

29.04.2011
 
Beware of the danger of electric shock, burns and sparks!

Beware of the danger of electric shock, burns and sparks!

The photo shows that even skilled profesionals can make a mistake and burn the battery terminal in a fraction of a second……..

The lesson learned is: Pay more than a usual attention to your work when assembling the battery packs and sets.

22.04.2011
 
FAQ: LiFePO4 - LiFeYPO4 cell cycle voltage levels

FAQ: LiFePO4 - LiFeYPO4 cell cycle voltage levels

The LFP (LiFePO4 or LiFeYPO4) cells operate within the 2.5 V to 4.0V voltage levels. In order to extend the life-span, many users prefer to operate within narrower voltage levels - as seen from the table above. 

Check also the settings for the RT-BMS as explained here.

14.04.2011
 
Size of the terminal connectors for 90AH cells

Size of the terminal connectors for 90AH cells

Product code LFP090-CON

07.04.2011
 
Solar charging of the LFP(LYP) batteries

Solar charging of the LFP(LYP) batteries

The high powel solar panels are used to harvest the solar evergy into the LFP batteries. A specialized solar charger manages the charging of the battery pack. The solar charging allows to be full independant (off the grid).

07.04.2011
 
Size of the terminal connectors for 40AH cells

Size of the terminal connectors for 40AH cells

Product code LFP040-CON

04.04.2011
 
EVKart ready for new testing rides

EVKart ready for new testing rides

The installation of the EVKart for 72V 60Ah was finished and we are going to make the first test rides. 

03.04.2011
 
EVKart installation continues

EVKart installation continues

We plan to have the EVKart V2 running in the beginning of April. More details to follow.

16.03.2011
 
The electric power boat in Croatia

The electric boat at sea...
The battery pack using 200Ah cells

The electric power boat in Croatia

… using the Agni motors and the LFP 200AH cells equipped with RT-BMS.

Photo courtesy of ABA VELA d.o.o., Split, CROATIA

14.03.2011
 
Cooling Akumons using computer fans

Cooling Akumons using computer fans

(source Fiat Seicento project)

14.03.2011
 
High speed balancing with high currents using Akumons

High speed balancing with high currents using Akumons

A simple solution using the automotive 12V relay and the 12V halogen bulbs. 

14.03.2011
 
EVKart project - installing 72V/60Ah pack

EVKart project - installing 72V/60Ah pack

The 3 pcs of 24V 60AH packs ready for the installation.

07.03.2011
 
EVKart project - installing 72V/60Ah pack

EVKart project - installing 72V/60Ah pack

The new improved EVKart project will be using 6 pcs of 12V 60Ah batteries to take the total of 72V/60Ah battery pack. The pack consists of 3 identical 24V/60Ah pack that can be easily changed.

07.03.2011
 
Simple solution to make a 24V battery pack

Two 12V 60Ah batteries
Handle to carry the pack
Fuse and Akumons inside

Simple solution to make a 24V battery pack

Two 12V batteries (here 12V 60A) are packed together. A plastic handle is mounted too, to allow easy carrying of the pack.

A high power fuse (400A) and two Akumons are mounted inside a plastic box.

05.03.2011
 
Using the LiFePO4 batteries for off-grid solutions

Using the LiFePO4 batteries for off-grid solutions

Combining the "easy to get components" to build off-grid solutions: solar chargers (charge controllers), wind-turbine invertors, UPS…..

To get a reliable and highly efficient energy storage the LFP batteries are used.

04.03.2011
 
Installing the LFP batteries for UPS

Two 12V 20AH LP batteries - 7.24 kg

Installing the LFP batteries for UPS

The two LP 12V 20AH batteries provide up to 500Wh of energy, a double value of the SLA batteries. Using bigger batteries (40AH, 60AH…) can even multiply the performace.

04.03.2011
 
Replacing SLA in the UPS with LFP

UPS battery pack 4x SLA
10.90 kg of lead acid "trash"
Chinese OEM under the APC sticker

Replacing SLA in the UPS with LFP

Multiply the performance of any UPS (Uninterruptable Power Source) by replacing the SLA (Sealed Lead Acid) batteries with the LFP (Lithium Phosphate) technology.

The old battery pack on the photos is from APC 1000VA rack UPS model. The nominal capacity of the pack is 24V 14Ah (2S2P configuration). The real energy available from the pack is max 250Wh. This means that a 250W computer may run up to 60 minutes from the UPS with the original SLA battery.

03.03.2011
 
LP12V17AHP - 12V/17Ah - Test results

LP12V17AHP - 12V/17Ah - Test results

The deep cycles for the LiFePO4 cells used in these PCM batteries is as low as 2.00V. This means the minimal cut-off voltage is approx 8.00V.

Note that the PCM inside this type of battery is designed only for last moment safety power-disconnect. In normal operation, the user must stop discharging the battery when the voltage gets bellow 10V (for 12V batteries). This means the battery voltage MUST be monitored outside the battery and the load must be stopped when the voltage is getting to 10V level.  For the proper operation the PCM board inside is not designed to replace a battery management!

12V batteries on our e-shop

02.03.2011
 
We have the high power capacity Lithium Iron batteries

We have the high power capacity Lithium Iron batteries

01.03.2011
 
Testing of the 36V 20AH battery pack with SBM

Testing of the 36V 20AH battery pack with SBM

(SBM - Simple Battery Management)

28.02.2011
 
FIAT Seicento Elettra - conversion to lithium - more photos

28.02.2011
 
DFM Mini Electric - Conversion to Lithium

DFM Mini Electric - Conversion to Lithium

The Dong Feng Mini Car (electric version) is being improved with lithium batteries. The original 6 pcs of 12V 150AH lead acid batteries have been replaced with LP 12V 90AH. More information to follow.

21.02.2011
 
LFP20AH - deep frozen test (-18 deg C)

LFP20AH - deep frozen test (-18 deg C)

The test data of a fast discharge at 60A (3C). Download here.

21.02.2011
 
LFP20AH cells test data

LFP20AH cells test data

Discharge of the 20AH cells at 1C (20A current). Download here.

20.02.2011
 
FAQ: Winston (ThunderSky) single cell dimensions

FAQ: Winston (ThunderSky) single cell dimensions

Thunder Ningbo TS-LFP20AHA - 20AH - 71x42x152 mm
WB-LYP40AHA, TS-LFP40AHA - 40Ah - 116x46x188 mm
WB-LYP60AHA, TS-LFP60AHA -60Ah - 115x61x212 mm
WB-LYP90AHA, TS-LFP90AHA -90Ah - 145x61x217 mm
WB-LYP100AHA, TS-LFP100AHA -100Ah - 145x68x217 mm
WB-LYP160AHA, TS-LFP160AHA -160Ah - 182x71x277 mm
WB-LYP200AHA, TS-LFP200AHA -200Ah WIDE - 362x56x256 mm
WB-LYP200AHA, TS-LFP200AHA -200Ah TALL - 183x100x276 mm
WB-LYP260AHA, TS-LFP260AHA -260Ah - 362x56x283 mm
WB-LYP300AHA, TS-LFP300AHA -300Ah - 362x56x306 mm
WB-LYP400AHA, TS-LFP400AHA -400Ah - 461x65x285 mm
WB-LYP700AHA, TS-LFP700AHA -700Ah - 627x67x306 mm
WB-LYP1000AHA, TS-LFP1000AHA -1000Ah - 850×71×375 mm
WB-LYP1000AHA, TS-LFP1000AHA -1000Ah - 560×130×356 mm (AHC model)
WB-LYP7000AHA, TS-LFP7000AHA -7000Ah - 1057×166×786 mm (AHC model)

   ...more >>

19.02.2011
 
Safety reminder, discharge currents

Keep in mind that the energy stored in the lithium cells may cause severe burns or fires if discharged improperly.  source

19.02.2011
 
100AH cell needs 0.66Ah to charge from 3.4V to 3.5V

100AH cell needs 0.66Ah to charge from 3.4V to 3.5V

Cell was held at 3.397V until the current was below 50mA before start of test. Initial current was 3.486A and ending current is 38mA. Amp-hours put into cell: 0.6588Ah. Source

16.02.2011
 
Assembling 12 pcs of 3.2V cells into a 36V 20Ah pack

Assembling 12 pcs of 3.2V cells into a 36V 20Ah pack

16.02.2011
 
New model of charger - 12V 5A

New model of charger - 12V 5A

Ideal pro the PCM packs or for the 12V LP batteries (slow charging). Check here Charger 12V/5A for LiFePO4 cells.

16.02.2011
 
FIAT Seicento Elettra - conversion to lithium

FIAT Seicento Elettra - conversion to lithium

 

Another lithium conversion project using the 12V LP batteries. Fiat 600 Elettra will be converted to full LiFeYPO4 battery traction. 

Check the original forum in Italian.

14.02.2011
 
The Charging 12 pcs of 20Ah cells

 

The Charging 12 pcs of 20Ah cells

The initial charging of the number of cells. For charging we are using a laboratory power supply capable of 5V 100A. We set the nominal voltage for 3.8V and connect the cells.

These 12 cells in parallel make a big 3V 240AH cell together.

Warning: when charging in parallel, it is a MUST (!) to double check the correct polarity of the cells. Connecting a cell in reverse polarity will cause a dangerous short circuit that may result in a strong sparking. BE EXTREMELY CAREFULL (!).

Warning: we suggest to wear protective eye-glasses to avoid a possible damage to the eyes by sparks or melted metals in case an accident happens.

14.02.2011
 
Charging 12V batteries in a parallel pack

 

Charging 12V batteries in a parallel pack

Six 12V 60AH batteries chargered with 12V 100A charger. The batteries are in parallel and make 12V 360AH pack. 

Hint 1: Note that the terminals of the charger are connected on the oposite sides of the pack. This is a small hint to make sure that all the batteries will be chargered equally during the high speed charging.

Hint 2: Additionally after the charge cycle is finished, it seems good to let the batteries rest and equalize over 1 or 2 hours and then make another charge to full. This may be repeated 2 to 3 times to make the batteries in the pack equally charged.

14.02.2011
 
Installation diagram for a battery pack based on the 12V monolithic LP batteries

 

Installation diagram for a battery pack based on the 12V monolithic LP batteries

This diagram give details on how to install the battery pack using the 12V monolithic LP batteries. This solution is especially suitable for small systems like EV boats operating at 24V (2 batteries), 48V (4 batteries) or EV cars (with 6 and more batteries).  Download  the PDF file with the installation.

The management of the battery pack is done by means of the AKUMON AKM-A1.  The low discharge warning can be optionally given by the BM1 - battery monitor connected to each 12V battery.  The voltage of each battery is provided by means of the APM1 - Battery Indicator.

   ...more >>

07.02.2011
 
Testing the 20AH cells 

 

Testing the 20AH cells  (from our customer)

Please notice the circuit-braker attached to the pack. 

01.02.2011
 
The Float voltage for the LiFeYPO4 batteries

 

The Float voltage for the LiFeYPO4 batteries

Unlike the lead acid batteries, there is no need for lithium batteries to apply the constant voltage to maintain the cells in a fully charged condition. (Typical for lead acid batteries 12V -  Gel 13.05V, Flooded 13.4V and AGM 13.6V values @ 25°C). 

In case you replace the lead acid battery with the LiFeYPO4 battery, it is good to check how the device behaves when charging the battery.  When applying the unmanaged float voltage (all called trickle charge), the voltage for LP 12V battery should be always bellow 14.4V  (3.60V x 4 cells).  Simply said the AGM value of 13.6V should be always OK with the LP batteries / LFP cells.

30.01.2011
 
Battery Delivery Information (Jan 30, 2011)

 

Battery Delivery Information (Jan 30, 2011)

Unfortunatelly, we learned that the sea cargo with batteries is delayed for at least 4 or 5 weeks. This means that the battery delivery originally scheduled for February 15th will be delayed up to March 15th ~ 20th.

Also, due to the busy production and the Chinese New Year holidays, the upcoming cargo will also be delayed. The estimated delivery is now June 1st.

27.01.2011
 
12V DC to 230V AC invertors - 300 W model

12V DC to 230V AC invertors - 300 W model

Get the 230V AC output from a 12V battery

This 300W model is suitable from small equipment like computers, radios, TV-sets, lights, ventilators, chargers and other devices with less than 300W power.

The DC-AC Invertor - technical specification:

Input voltage: (DC) 10-15V (traction battery, car battery, LP battery)
Output voltage (AC): 230 V +-10%
Maximal output power: 300 W
Max peak output power: 600 W (10 seconds)
Input current rating: 30A (@12V)
Stand-by consumption: bellow 0,4A

Output AC form: linear modified (non-sinus)
Output frequency: 50Hz +-5%
Efficiency: better than 80 %
Low voltage protection sound warning: 10 V
Cut-off voltage (deep discharge): 9.5 V
Overheat protection: 60 deg C
Over voltage protection: 15 V
Overpower protection: 340 W
Short circuit protection: electronic
Polarity protection: Yes (fused)
Fuse: 12V 40A – 1 piece
Dimensions: 210 / 116 / 60 mm
Weight without packing (netto): 740 g
EU socket + plug supplied
EU market CE test approval

   ...more >>

28.02.2010
 
The TS-LP12V100AH promo

The TS-LP12V100AH promo

Check the LP12V100A promo leaf-let in Chinese and Chinese-English.

27.02.2010
 
Do the lithium iron (LiFePO4) and/or lithium yttrium iron (LiFeYPO4) batteries leak the electrolyte?

Do the lithium iron (LiFePO4) and/or lithium yttrium iron (LiFeYPO4) batteries leak the electrolyte?

The LFP/LFYP batteries do not leak. The vent on the batteries is designed to release the presure of the possible gasses in case some kind of a battery accident would occur.  Such an accient may include: serious overcharge, short circuit connetion, mechanical damage to the battery.

21.02.2010
 
Golf conversion photos

The detail of the back pack installation
The back battery pack installed

 

The VW CityStromer convertion to lithium (cont).

The whole conversion is nearly done. The battery packs installed, we are getting ready for the first LiFePO4 drive! 

20.02.2010
 
The Conversion to Lithium …. (cont)

The front pack over-all photo.
The front pack with cabling installed.
The initial charging of the cells.

 

The Conversion to Lithium …. (cont)

The front battery-pack tray with the new batteries. The balancing modules already installed and the cabling done.

20.02.2010
 
The Conversion to Lithium

The Conversion to Lithium …. (cont)

The back-pack tray with new batteries. The balancing modules already installed and the Master BMS placed to the middle of the last 8 batteries.

13.02.2010
 
Lead Acid vs Lithium Iron! Guess Who Wins!

Lead Acid vs Lithium Iron! Guess Who Wins!

Please check the comparison datasheet with useful information on lead-acid batteries versus the LiFePO4.

13.02.2010
 
High-speed charging test 30A with 4 pcs of LP12V 20Ah batteries including temperature

High-speed charging test 30A with 4 pcs of LP12V 20Ah batteries including temperature

Download the XLS data file including graphs. If you have any questions and/or comments, please let us know.

12.02.2010
 
high-power charger for LiFePO4/LiFeYPO4

Do you need a high-power charger for LiFePO4/LiFeYPO4? Please check our Lithium Charger products. Be sure to contact us for the quote.

12.02.2010
 
Thundersky LiFePo4 Battery Cell Chemistry and Disassembly

Inside TS battery (1)
Inside TS battery (2)
Inside TS battery (3)
Inside TS battery (4)
Inside TS battery (5)
   ...more >>

12.02.2010
 
The data of the 30A load test on 4 pcs of LP12V 20Ah batteries incl. temperature

The data of the 30A load test on 4 pcs of LP12V 20Ah batteries incl. temperature

Download the XLS data file. If you have any questions and/or comments, please let us know.

10.02.2010
 
Winston battery pack 32x 200Ah

The 32x 200Ah battery pack with balancers installed on the aluminum cooling belts.

10.02.2010
 
TS-LP12V80AH on scales…… 12.32 kg

TS-LP12V80AH on scales…… 12.32 kg

09.02.2010
 
The ballancing modules of the RT-BMS system

The ballancing modules of the RT-BMS system

Each cell one module. That’s it.

09.02.2010
 
32x 200Ah battery pack for VW Citystromer

32x 200Ah battery pack for VW Citystromer

The first ballancers installed on aluminium cooling belts.

09.02.2010
 
Thundersky LiFePo4 Battery Cell Chemistry and Disassembly

Thundersky LiFePo4 Battery Cell Chemistry and Disassembly

A look at the interior of a LiFePo4 cell and discussion of battery chemistry. (by Jack Rickard, http://www.ev-tv.me)

http://media.ev-tv.me/thunderskybattery-1280.mov (2Gb!)

03.02.2010
 
LiFePO4 is ideal for the Electric Wheelchairs power supply!

LiFePO4 is ideal for the Electric Wheelchairs power supply!

Understand the benefits now:  100% safe - no lead, no dangerous acids. Much lighter (30% weight) - 12V 100Ah LFP battery is only 14 kg. Higher capacity - 145% when compared to lead-acid. The visiblle benefit: the increase of the driving distance. Works even in -35 deg C - no problems in winter. Fast charging possible. LFP batteris can be safely charged just in 1 hour. Extreme life span: 2000 to 3000 charging cycles.  Support for the orginial accessories: Original 12V, 24V chargers can be used.

Do you want to try LiFePO4 in the Electric Wheelchairs? Please contact us for special quote to support people with special medical needs.

01.02.2010
 
32x 200Ah battery pack for VW Citystromer

32x 200Ah battery pack for VW Citystromer

Another installation using the LFP cells. Please keep cheing the progress of our work.

31.01.2010
 
The Enhanced Lithium Iron Technology

FAQ:  The Enhanced Lithium Iron Technology

Q:  What is the enhanced lithium iron technology?

A:  The enhanced lithium iron technology is the latest further development of the high power lithium iron cells and batteries using additional chemical particles for the cathode of the cells.  This means the standard LiFePo4 chemistry is enhanced by using chemical compounds of other materials: yttrium, magnesium, titan, vanadium and others. This makes for the new chemistry names:  LiFeYPO4, LiFeMgPO4, LiFeTiPO4 and others.

Q: Who are the battery manufacturers who use the enhanced lithium iron technology?

A: The long term market leader has been the ThunderSky group in China. The TS batteries are world-wide recognized as the leading brand for the “yttrium technology” – LiFeYPO4.  The magnesium chemistry has been used by Valence Battery Group - LiFeMgPO4.  The Tinanium batteries are still under developments using Li4Ti5O12. The famous global manufacturer Varta is offering new solutions under the CellPac Plus brand.

31.01.2010
 
Using LiFePO4 batteries as starting batteries for the fuel cars

Using LiFePO4 batteries as starting batteries for the fuel cars

Q: Can the 12V LFP/LFYP batteries be used as starting batteries for the regular vehicles?

A:  Yes. We highly recommend using the LFP/LFYP batteries for starting vehicles. Their performance is much better than the lead-acid batteries.

Q: What are the advantages of the LFP/LFYP batteries?

A:  LiFePO4 batteries are able to provide much higher starting current than the lead-acid batteries (SLA). They work even in extreme low temperatures (bellow –35 deg. C).  They cannot “get frozen” like SLA batteries. They contain no acids and require no special care. Their life span is 10 years and more, while SLA batteries may last just 4 to 5 years.   There are no known disadvantages when using LFP/LFYP batteries.

   ...more >>

30.01.2010
 
Toyota Prius Plug-in Conversion using Thundersky cells

 

Toyota Prius Plug-in Conversion using Thundersky cells  (http://www.eaa-phev.org/wiki/Prius_PHEV)

This is a photo of the Do-It-Yourself plug-in conversion kit for Toyota Prius. Tha author is Jim Fell, Peterborough, England.  (Jim was using the older generiation of the ThunderSky cells - white color.)

30.01.2010
 
Toyota Prius Plug-in Conversion using Thundersky cells  (Enginer.us)

Toyota Prius Plug-in Conversion using Thundersky cells  (Enginer.us)

This is a photo of the commercially available plug-in conversion kit for Toyota Prius. The battery pack uses ThunderSky cells.  (-link-)

Yet another commercially available plug-in conversion kit is available from http://www.pluginsolutions.com/

30.01.2010
 
Toyota Prius Plug-in Conversion using Thundersky cells  (Czech)

Toyota Prius Plug-in Conversion using Thundersky cells  (Czech)

This is a photo of the experimental Plug-in conversion made in Czech, EU. The battery pack uses 77 pcs of TS-LFP40Ah.

28.01.2010
 
Real Driving Distances for VW CityStromer

Link: Real Driving Distances for VW CityStromer

The real driving distances of VW CityStromer using the 80Ah LFP batteries and the 240Ah LFP battery pack

27.01.2010
 
The LiFePO4 12V battery serial connection cycle tests

The LiFePO4 12V battery serial connection cycle tests

Please download the XLS with real data of our performance tests of 12V 20AH batteries. This is a demonstrattion of high speed discharge @40A and high speed charge @30A. If you have any questions and/or comments, please let us know.

19.01.2010
 
Photo of battery delivery

It is here again…. another cargo of the LiFeYPO4 batteries just arrived!

16.01.2010
 
FAQ: 12V LP battery balancing and charging

Question:  Can I charge the 12V LFP battery using a conventional auto-moto charger 12V?

Answer:  With most of “cheap” car battery chargers you **cannot** charge the 12V LFP battery. Cheap chargers often end charging at 14V.  As a result the LFP batteries are not charged sufficiently. In order to charge to full you need to reach above 16V.

If you have an “advanced” manageable charger, it can be used provided you can set the charge level to at least 16V.

Simply said: you can charge with any kind of charger if you make sure that the battery voltage reaches at least 16V, but does not exceed the maximum limit of 17V.

Question: What are the experiences of balancing 12V batteries, when, for example, four pieces of 12V/40Ah in the series?

Answer: Unlike 3.2V cells that can hardly be operated without balancing, the 12V LP batteries behave “very sophisticated”, so the need for continuous balancing practically does not exist. It is just enough to check the voltage levels during inspection periods. If you notice a difference in the battery voltage levels, we recommend balancing all batteries manually to the same maximum charging level (ie, max 17 V / per battery).

   ...more >>

16.01.2010
 
Lithium Iron Phosphate (LiFePO4 / LiFeYPO4) in Norway

Lithium Iron Phosphate (LiFePO4 / LiFeYPO4) in Norway

Inspired by our simple 8x 80Ah lithium testing conversion, an EV user of a CityStromer from Norway has send us this photo of the 8x 80Ah installation in the back of the VW Golf Citystromer.  These batteries are running quite well despite the cold Norwegian winter weather with temperatures bellow -15 deg.C.

10.01.2010
 
The performance range for LFP cells (3.2V) and LP batteries (12V) under +25°C and -35°C

The performance range for LFP cells (3.2V) and LP batteries (12V) under +25°C and -35°C

Please see the voltage levels for LiFePO4 / LiFeYPO4 cells and batteries under different temperatures. Comment: In your BMS systems you should be able to set the voltage characteristics based on the temperature monitoring.

08.01.2010
 
Simple Hand Drawing - The Serial Connection

Simple Hand Drawing - The Serial Connection

This is a serial connection, using the 12V LFP battery blocks.

30.12.2009
 
3.2V LiFePO4 / LiFeYPO4 cell pricing

3.2V LiFePO4 / LiFeYPO4 cell pricing

The most competitive pricing for LFP cells in Europe. We offer the volume discounts and low prices for LFP cells. Please contact us to get the latest price-list.

We will be pleased to deliver the LFP cells to you. Fast and reliable!

Technical specifications:

30.12.2009
 
12V LiFePO4 / LiFeYPO4 battery pricing

12V LiFePO4 / LiFeYPO4 battery pricing

The most competitive pricing for 12V LFP batteries in Europe. We offer the volume discounts and low prices for 12V LFP batteries. Please contact us to get the latest price-list.

We will be pleased to deliver the LFP batteries to you. Fast and reliable!

Technical specifications:

1) Battery dimensions for the 12V series - please see here complete overview

2) Complete overview of the technical specifications

3) Photos:  12V 100AH

Please check our main blog page for news and other details!

26.12.2009
 
New record:  129% of capacity

New record:  129% of capacity

The LFP (LiFEPO4 / LiFeYPO4) batteries capacity demonstration: 20Ah battery gives 25.85Ah of real energy this makes 129% of the nominal capacity.

25.12.2009
 
Copper Terminal Belts

Copper Terminal Belts

High power drains require quality copper terminal belts to connect the batteries. We provide these terminal belts and additional mounting accessories. Please contact us for the quote.

20.12.2009
 
12V 100A high speed charger for lithium cells

12V 100A high speed charger for lithium cells

The full photo of the charger.

20.12.2009
 
12V 100A high speed charger for lithium cells

12V 100A high speed charger for lithium cells

The high speed charger for LFP / LiFePO4 / LiFeYPO4 batteries and cells. Using this charger you can charge lithium batteries just in few minutes.  Operating range 10V to 17V. Max current DC 100A. Input 230V 10A max.

20.12.2009
 
12V 100Ah monolitic LiFePO4 / LiFeYPO4 battery

12V 100Ah monolitic LiFePO4 / LiFeYPO4 battery

Ideal solution for power supply:  direct 12V without BMS or monitoring systems needed with other lithium batteries. High currents up to 1000 A supported. Low weight: just about 14 kg. No acid! No lead! No health danger! Full working temperature range (-30 to +70).  High speed charging supported.

20.12.2009
 
12V 100Ah monolitic LiFePO4 / LiFeYPO4 battery

12V 100Ah monolitic LiFePO4 / LiFeYPO4 battery

The largest 12V monolitic LiFePO4 battery on the market. Allows high discharging peak currents - up to 1000A.  Please see the tech. specification here.

Works in full range of operating temperatures. Can be used easily for starting of automobile engines under extreme low temperatures.

20.12.2009
 
12V 100Ah monolitic LiFePO4 / LiFeYPO4 battery

12V 100Ah monolitic LiFePO4 / LiFeYPO4 battery

The detail of the (+) pole connector.

20.12.2009
 
4x 12V 20AH batteries under test

4x 12V 20AH batteries under test

Please see the photo of our test setup for 12V 20A batteries in 4 series string. We want to demonstrate charging and discharging levels for this model pack.

19.12.2009
 
124% of capacity

124% of capacity

The LFP (LiFEPO4 / LiFeYPO4) batteries capacity demonstration: 20Ah battery gives 24.83Ah of real energy this makes 124% of the nominal capacity.

19.12.2009
 
Winston 12V/20Ah battery

 

Photo of 12V 20AH LFP battery, see details here: http://gwl-power.tumblr.com/search/20Ah  The 20AH battery dimension see here: http://gwl-power.tumblr.com/post/187997557/high-voltage-lithium-yttrium-iron-lifepo4-lifeypo4

16.12.2009
 
FAQ - Frequently Asked Questions

FAQ - Frequently Asked Questions

What is the 4.25 Volt level for LFP cells?

It is the maximal charging level. When charging the voltage per cell must be limited to 4.25V and bellow. If the voltage exceeds 4.25V, the cell is getting internally damaged and the life span is shortened.

What is the 3.2 Volt level for LFP cells?

It is the nominal discharge voltage.  Please see the discharge voltage diagram. During the discharge the nominal voltage is 3.2V.

What is the 2.5 Volt level for LFP cells?

It is the minimal discharge voltage.  During discharge, the battery voltage must not drop bellow this level. When the voltage goes down to 2.5V the discharge must be stopped. If the voltage goes bellow 2.5V, the cell is getting internally damaged and the life span is shortened.

   ...more >>

13.12.2009
 
ThunderSky 160AH capacity test

ThunderSky 160AH capacity test

Please see another test by JRR Nortec tetsing equipment. Base on this report, you can see the capacity of the 160Ah cell reaches the total of 165.4Ah. This makes 103% capacity level.

15.11.2009
 
The RT-BMS System Components Installation Diagram

The RT-BMS System Components Installation Diagram

The RT-BMS is designed according to the concept of single real-time balancers managing and balancing up to 192 individual cells. The individual cell-balancing units are controlled by the central Master RT-BMS Control Unit.

14.11.2009
 
Winston 12V batteries LiFeYPO4

The box with 10 pcs 12V 20AH LFYP
The box with 10 pcs 12V 40AH LFYP
The box with 3 pcs 12V 100AH LFYP

 

See the photos of the LiFeYPO4 batteries: 12V 20AH, 12 40AH and 12V 80AH from our latest shipment.

08.11.2009
 
Battery Monitor and Recorder in Real Use 

 

Battery Monitor and Recorder in Real Use 

  • CellLog 8S has been 100% calibrated before it enters to the market, at the same time, it supports the calibration by users themselves.
  • CellLog 8S has a 16Mbit flash storage, which can log offline data in 36 hours.
  • Support upgrading the hardware program by USB port. The CellLog 8S also supports the “logview” software and can display, plot and analyze the charge and discharge data by it. (See detail information about logview in the following website: http://www.logview.info)

ONLY EUR 27.00 !!! Please contact us for express delivery in Europe.

ENGLISH MANUAL DOWNLOAD

08.11.2009
 
The difference between the LFP and LFYP

FAQ: Is there a fundamental difference between the LFP (LiFePO4) and LFYP (LiFeYPO4)?

Yes. The essential difference is the use of the chemical element yttrium (Y) instead of iron (Fe).

The chemical structure is in stead of LiFePO4 (LFP) changed to LiFeYPO4 (LFYP). See the chemical composition LiFeYPO4 batteries according to the manufacturer:
http://gwl-power.tumblr.com/post/180659445/the-material-composition-of-the-lifeypo4-battery

The essential difference is in the behavior of chemical elements yttrium and iron. While iron is very susceptible to oxidation and reactions with other chemical compounds, the element yttrium is more chemically stable, not easy to to reach with other compounds. The result is much stronger chemical stability and durability.

While LiFePO4 battery shelf-life is usually given as 3 to 5 years. For batteries using yttrium the service life is set to 10 or more years. Not for nothing did one of the leading scientists said: “Yttrium may be the iron of the future”.

01.11.2009
 
Dynamic-BMS for 12 Volt Lithium Yttrium Iron Batteries

 

Dynamic-BMS for 12 Volt Lithium Yttrium Iron Batteries

The Dynamic Battery Monitor System (BMS) with balancing function is the first worldwide solution to manage series of 12V Lithium Yttrium Iron batteries (LFYP batteries).  The LFYP batteries made by Thunder-Sky are the only direct 12V lithium solution on the world market.  Now you can use 12V lithium batteries instead of many small 3.2V cells.  Read more in Product Development Report 2009/11/01

28.10.2009
 
TS-LFP160AH TEST REPORT

TS-LFP160AH TEST REPORT

Please download an indepedent test report of the performance of the 160 AH TS cells. These tests were made by JBI Corp - http://www.jbicorp.com/ 

28.10.2009
 
TS-LFP400AH TEST REPORT

TS-LFP400AH TEST REPORT

Please download an indepedent test report of the performance of the 400 AH TS cells. These tests were made by JBI Corp - http://www.jbicorp.com/

28.10.2009
 
36V pack assembled

 

The 36V pack assembled and the Simple Battery Management (SBM) installed. Now we are ready to go!

28.10.2009
 
packs of 6 cells

 

Two packs of 6 cells are ready to be assembled into a 12 cell string, to make a 36V solution.

28.10.2009
 
The cabling for the BMS

 

The cabling for the BMS and ballancing circuit attached to the cells.

28.10.2009
 
TS 40 AH cells

 

TS 40 AH cells connected together into a serial string using the copper terminal connectors.

28.10.2009
 
Thunder Sky Battery Technical Specification

Thunder Sky Battery Technical Specification

Please download the official technical specification of the TS batteries.

25.10.2009
 
A full cell cannot charge an empty cell!  You need to charge the cells to the same full level together!

 

Just another photo….. This way you can simply balance a fully charged cells with the discharged cells…. We just leave them connected over night and the next morning the cells are ready to go on….  they are partially balanced, BUT NOT COMPLETELY.

Note: A full cell cannot charge an empty cell!  You need to charge the cells to the same full level together!

25.10.2009
 
The first step

 

Installing a battery pack? The first step is ballancing all the cells at the same voltage level. This can be done easily…. as you see on the photo. And here is the photo of the whole pack.

25.10.2009
 
Batterry voltage data for last 8000 sec.

Batterry voltage data for last 8000 sec.

Please download the battery data for the last 8000 seconds of the drive. Check the Auto88.cz forum link.

25.10.2009
 
VW Golf 3 CityStromer 240Ah - 218 km per charge

 

VW Golf 3 CityStromer 240Ah - 218 km per charge

We continue our test rides of the VW Golf CityStromer with 24 pcs of 12V 80Ah lithium batteries. We have reached the new record of 218 km per single charge in real trafic. This distance was reached in the ordinary city trafic in the capital city of Prague. The city driving means a lot of stoping and accelerating at the many crossroads. We hope to reach even larger distance driving on intercity roads without the many crossroads.

25.10.2009
 
12V lithium yttrium battery 80A

12V lithium yttrium battery 80A

Operating voltage 10V ~ 17V, nominal capacity 80A, max. charge current 50A, max. discharge cont. current 150A, max. discharge impluse current 900 A (6 sec.), weight 12 kg.  Non-toxic, no-acid, no-lead. No BMS needed, the cell stability is based on the internal electro-chemical balancing.

11.10.2009
 
VW Golf 3 CityStromer 240Ah installation finished

 

VW Golf 3 CityStromer 240Ah installation finished

We have installed 24 pcs of 12V 80Ah lithium batteries in 8-serial 3-parallel
configuration.  Total power is based on 96V 240 Ah.  The weight of the pack
is 283 kg.  This means a saving of 229 kg against the original lead-acid
batteries with 512 kg (16 x 32kg).
 
The installation is done without any mechanical change to the VW Golf design.
The batteries fit perfectly.

Please read details in the Auto88 discussion forum.

07.10.2009
 
23kWh LiFeYPO4

 

The 23kWh LiFeYPO4 battery pack for VW Golf CityStromer installed! (2)

The front part of the VW Golf CityStromer hosts 6 pcs of the LP 12V 80AH batteries.  There is extra space left, that may be used by a high speed charger in the future.

The total installation is made of 24 pcs of the LP 12V 80A cells. 6 pcs in the front battery space, 18 pcs in the back battery space.

The driving distance per single charge? Well, let us see! We are going to post the results here!

07.10.2009
 
23kWh LiFeYPO4

The 23kWh LiFeYPO4 battery pack for VW Golf CityStromer installed! (1)

This is the photo of the installation of the 18 pcs of the LP 12V 80AH batteries into the original space in the back of the VW Golf CityStromer.  The 18 pcs batteries fit exactly into the space without any need for mechanical changes.

07.10.2009
 
160AH battery pack

 

This is a photo of a 160AH battery pack using Thunder-Sky LFP/LFYP cells. (source EVC Group web)

22.09.2009
 
The really HUGE LFP pack

 

The really HUGE LFP pack

This is the photo of the initial charging and testing of the LFP battery pack.

We are now working on the new modification of the VW Golf CityStromer.  Here is the technical review of the project:

Original battery:VARTA 83201 batteries - 16 pcs. Nominal 6V 240Ah, real capacity 6V 115Ah (at 150A), weight 32 kg each. Total weight of 16 pcs = 512 kg.  This is the best VARTA technology: 512 kg of toxic lead and deadly acid makes 11kWh of real energy.

New battery: Thunder-Sky Lithium-Yttrium 12V80Ah batteries - 24 pcs. Each 3 pcs of the  80Ah batteries make one 12V 240Ah pack. Each battery weights 11.7 kg. Total weight of 24 pcs = 280 kg. This is the best lithium technology: 280 kg of non-toxic, non aggressive batteries makes for 23kWh of real energy.

We hope to reach 250 km of driving distance per single charge!  We keep you updated here!

22.09.2009
 
Copper Terminal Connectors

 

Copper Terminal Connectors

The terminal connectors are used to connect the LFP cells into series. We supply these terminal connectors as well. They are made of high-quality copper.

16.09.2009
 
standard and wholesale pricing

 

Please contact us for the standard and wholesale pricing for the lithium yttrium iron phosphate cells and batteries. We can offer the best volume pricing for your energy solutions and projects. The best price starts at USD $1.0xx per Ah. (or EUR 0.7xx per Ah). Please send email to us to get the quote.

16.09.2009
 
largest battery pack

We are working on our largest battery pack. The batteries are getting ready for the initial formation charging and balancing cycle.

14.09.2009
 
Winston 12V dimmensions

LFP 12V 20Ah battery dimensions
LFP 12V 40Ah battery dimensions
LFP 12V 80Ah battery dimensions
LFP 12V 100Ah battery dimensions

 

High voltage lithium yttrium iron LiFePO4/LiFeYPO4 batteries. Please see the dimensions of these high power traction batteries.

14.09.2009
 
VW Golf CityStromer

The VW Golf CityStromer with lithoum battery pack. The detail photo of the 8 pcs battery pack. Any questions?  Just let us know by email.

14.09.2009
 
VW Golf CityStromer

 

The lithium battery installation in the VW Golf CityStromer. For testing purposes 8 pcs of 12V 80Ah lithium batteries are used. Total nominal voltage 96V, total capacity 7.68kWh, total weight 94 kg.

14.09.2009
 
high voltage lithium yttrium iron LFP traction batteries

LFP 12V 20Ah battery specifications
LFP 12V 40Ah battery specifications
LFP 12V 80Ah battery specifications
LFP 12V 100Ah battery specifications

 

The electric specifications of the high voltage lithium yttrium iron LFP traction batteries. These baterries are available in 20Ah, 40Ah, 80Ah and 100 Ah models.

13.09.2009
 
Winston available on stock

3.2V 40Ah cells waiting for the delivery
3.2V 200Ah cells packed in boxes
12V 80Ah batteries ready on stock

 

Please see the examples of the photos of the cells and batteries available on stock. We have these high power batteries available in Europe and can arrange for delivery and shipping very fast. Please contact us for details if you wish to place an order. You can email us at auto88(at)auto88.cz.

13.09.2009
 
Battery pack using 12V for installation

Part of the LiFeYPO4 battery pack waiting for the installation…. The pack is based on the high voltage 12V 80Ah batteries.

13.09.2009
 
EV CitySax

 

The newly developed EV CitySax is using the LiFeYPO4 technology for the traction battery pack.  (86V 160Ah)

10.09.2009
 
Winston 12V batteries

Thunder-Sky 12V 20A Battery
Thunder-Sky 12V 40A Battery
Thunder-Sky 12V 80A Battery
Thunder-Sky 12V 100A Battery

 

Thunder Sky high voltage rare earth yttrium iron lithium power batteries. They are designed to replace the lead-acid batteries. They provide the best energy installments for the planes, ships, trains, automobiles and large scale mobile electric appliances.

10.09.2009
 
the demonstration of the ThunderSky LFP 40 Ah cells

 

Our company and our partners are extensively testing the BMS system for the high power traction batteries. The photo shows the demonstration of the ThunderSky LFP 40 Ah cells.

06.09.2009
 
Thunder-Sky TS-LFP800AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP800AH model specifications

06.09.2009
 
Thunder-Sky TS-LFP700AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP700AH model specifications

06.09.2009
 
TS-LFP9000AHB for Submarine application

Thunder-Sky Submarine Battery
TS-LFP9000AHB
Submarine Batteries

TS-LFP9000AHB - the LiFeYPO4 battery submarine model. Especially designed to replace other battery technologies. The lithium yttrium design gives the best performance and safety for military applications.

06.09.2009
 
Thunder-Sky TS-LFP400AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP400AH model specifications

06.09.2009
 
Thunder-Sky TS-LFP300AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP300AH model specifications

06.09.2009
 
Thunder-Sky TS-LFP260AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP260AH model specifications

05.09.2009
 
The material composition of LiFeYPO4

The material composition of the LiFeYPO4 battery technology by Thunder-Sky. The new yttrium technology replaces the previous LiFePO4 design.

05.09.2009
 
Thunder-Sky TS-LFP200AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP200AH model specifications

05.09.2009
 
Thunder-Sky TS-LFP160AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP160AH model specifications

05.09.2009
 
Thunder-Sky TS-LFP100AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP100AH model specifications

05.09.2009
 
Yttrium

 

Yttrium is found in most rare earth minerals, as well as some uranium ores, but is never found in nature as a free element. About 31 ppm (parts per million) of the Earth’s crust is yttrium making it the 28th most abundant element there, and 400 times more common than silver.

Yttrium has no known biological role, though it is found in most, if not all, organisms and tends to concentrate in the liver, kidney, spleen, lungs, and bones of humans.

Annual world production of yttrium oxide had reached 600 tonnes by 2001, with reserves estimated at 9 million tonnes. Only a few tonnes of yttrium metal are produced each year.  Wikipedia

05.09.2009
 
Thunder-Sky TS-LFP90AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP90AH model specifications

05.09.2009
 
Thunder-Sky TS-LFP60AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP60AH model specifications

05.09.2009
 
Thunder-Sky TS-LFP40AH

LiFeYPO4 (lithium yttrium iron phosphate) battery dimensions: Thunder-Sky TS-LFP40AH model specifications.

04.09.2009
 
LiFePO4 self discharge test

 

LiFeYPO4 battery self-discharge rate at normal temperature conditions, plus 20°C.

04.09.2009
 
LiFePO4 discharge test based on life cycles

 

LiFeYPO4 battery discharge characteristics based on the number of actual life-cycles. The cycle life is 5000 cycles at 80% capacity level, 8000 cycles at 70% capacity level. (The discharge rate is at 0.5 C.)

04.09.2009
 
LiFePO4 discharge test at different temperatures

LiFeYPO4 battery discharge characteristics in different temperature conditions. (The discharge rate is at 0.5 C.)

04.09.2009
 
LiFePO4 discharge test at 20°C

LiFeYPO4 battery discharge characteristics under normal temperature (20°C).

04.09.2009
 
Lithium Iron Phosphate

 

Lithium Yttrium Iron Phosphate high power battery design. The LiFeYPO4 technology is the next generation of the LiFePO4 batteries.


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