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07.11.2017
 
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. 

 

19.05.2017
 
Two inverters with limiter on one battery pack

Question:

Can I use two inverters with limiter with one battery pack? 

Answer:

Yes you can use more inverters at one battery pack by following connection. You can use 3 inverters on each phase too.

 

Legend:

1 - electricity meter

2 - inverter with limit 1

3 - inverter with limit 2

4 - Battery

5 - place of consumption

6 - Limit Current Sensors

 

Check all inverters with limiter.

19.06.2015
 
Microinverter plug

Can I plug the Microinverter directly into the socket or will I need special connector for that?

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

The plug to your domestic grid must be corresponding with standarts of your Country. You can buy these connectors in common electrical supplies. Proper connection of the plug and wires can make everyone.

 

To make the installation more comfortable we recommend you to check our offer of extension cables: http://www.ev-power.eu/_d3251.html

26.05.2015
 
What to do if solar panel produced 150W and i just consume 30w where 120W exceed go?

In this situation, the energy will go to the public grid which is not allowed in most of countries in EU.
So you have to avoid this situation.

1) Install current monitoring relay:
http://www.ev-power.eu/_d3376.html
http://www.ev-power.eu/_d4033.html

2) the power of solar system with gridfree have to be lower then your minimum consumption at your home.
Even for this case we recommend to instal Current monitoring relay.

Many information about Gridfree you can find also here:
http://gwl-power.tumblr.com/tagged/mcfaq
http://gwl-power.tumblr.com/tagged/GridFree
http://gwl-power.tumblr.com/tagged/MCInf

10.07.2014
 
What is a Grid-free - what is a Grid-tied

The Grid-Free installation is the name for the 100% self-consumption
installation using the GRID-TIED inverters.


See the explanation about GridFree instalation here:
-----------------------------------------------------
The basic GridFree principles:
http://gwl-power.tumblr.com/post/36758416239/micro-inverter-is-micro-good-ideas-for-you-with


Micro-Inveter Opens the GridFree World:
http://gwl-power.tumblr.com/post/36819163787/micro-inveter-opens-the-gridfree-world-standard


GridFree technology to reduce your energy demands:
http://gwl-power.tumblr.com/post/37061277055/gridfree-technology-to-reduce-your-energy-demands


The Grid-Free (Grid-Tied) inverters do not work in an island (off-grid) mode.

Please see this:

Can the Micro-Inverter work in off-grid mode (island mode)?
http://gwl-power.tumblr.com/post/37583550069/the-micro-inverter-safety-and-operation-faqs-q

   ...more >>

04.06.2014
 
How to make solar house with consumption up to 15 kW by GridFree system

We suggest use GridFree installation with solar panels, Micro-Inverters and current relay in this case. The advantage of the GridFree is easy and full modular installation for future extension of the system. The GridFree is also cost effective because you do not need batteries. Another advantage is you will still have the public grid connection as back up if the total consumption will be higher than the power from solar panels in cloudy days or night. The Government can put tax on commercial installations, but it cannot put tax or fee on self-consumption. The GridFree does not need any permit or license from the Government

More information about GridFreehttp://gwl-power.tumblr.com/tagged/GridFree

Products

04.06.2014
 
How to make 5 kW solar roof with public grid back up

The ideal solution for this case is Micro-Inverters Involar. The Micro-Inverters are safety because they use the 230V AC directly from the solar panels. For one 250Wp panel is suitable one Micro-Inverter directly connected and installed at the solar panel. Each Micro-Inverter is connected with next one at the 230V so there is not so much high current at the end of the solar plant. Suitable solar panel is the 250Wp model because the maximum output power of the Micro-Inverter is 230W. We need the 24 pieces of solar panels and Micro-Inverters to achieve the 5,5 output Power. There should be add next panels for better performance in cloudy days.

The monitoring is provided by eGate which communicate with MicroInvertes at the Power Lines and the eGate is connected to the cloud service SEDAS thru the Internet. Each eGate has login to the cloud services SEDAS and the cloud service is accessible everywhere from the Internet.  There is possible to connect max 16 Micro-Inverters to the each eGate. Please see the Demo of SEDAS here.

More information about Micro-Inverters: http://gwl-power.tumblr.com/tagged/MicroInv

   ...more >>

04.06.2014
 
How to reduce energy consumption of house by own producing energy from the sun.

The ideal solution for this case is the GridFree installation with solar panels, Micro-Inverters and current relay. The Government can put tax on commercial installations, but it cannot put tax or fee on self-consumption. The GridFree does not need any permit or license from  the Government:

http://www.pv-magazine.com/news/details/beitrag/german-solar-group-blasts-government-plans-to-tax-self-consumption_100014022/

Please see attached GridFree-schema.

More information about GridFreehttp://gwl-power.tumblr.com/tagged/GridFree

You will need following products for example for 1,4 kW system.

20.05.2013
 
GridFree - understanding the GridFree technology

GridFree - understanding the GridFree technology

A new animation to show the benefits of the GridFree technology.  Check the GridFree products at the EV-POWER.EU:

http://www.ev-power.eu/GridFree-Inverters/

15.04.2013
 
GridFree MicroInverter LED Status Error

GridFree MicroInverter LED Status Error

When problem is detected, the STATUS LED will display error in RED color

Internal Errors
1x Red - Primary Over Current, main circuit current is too big
2x Red - Internal Over Current
3x Red - Internal Over Voltage
4x Red - Internal Under Voltage
8x Red - Grid Synchronization is not OK
9x Red - Safety problem detected

Grid Errors or Grid is not stable
5x Red - The grid is not OK, may be voltage, frequency, or other thing of the grid are not OK. MicroInverter will try later to resume function.
6 x Red - Grid Over Frequency
7 x Red - Grid Under Frequency
10 x Red - Grid Over Voltage
11 x Red - Grid Under Voltage

Input Errors
13 x  Red - DC input voltage error. The DC input voltage is out of working range of the MicroInverter.

Temperature Errors
12 x Red - Heat Sink Over Heat – the inner temperature is too high
14 x  Red  - Internal temperature error

15.04.2013
 
GridFree eGate Gateway LED status

GridFree eGate Gateway LED status

Check the status of the LED for the GridFree MicroInverter gateway.

Additional information about the eGate functions are available at the user manual.

13.02.2013
 
Simple Balcony Installation

Simple Balcony Installation

Another idea for the installation of the solar panels at the balcony of a family house. This kind of installation is very simple when microinverters are used.

When will you install your own panels?

13.02.2013
 
A Solar Project with MicroInverters

A Solar Project with MicroInverters

A lot of energy from the sun can collected at locations such a balconies. See the photo of project using the MicroInverters to balance the consumption of a residential building. The PV panels are located at the railing of the balconies.

27.01.2013
 
MicroInverter GateWay eGate with on-line monitoring

MicroInverter GateWay eGate with on-line monitoring

The MicroInverter gateway allows to have 100% online monitoring of each microinverter and its performance. The data is recorded on-line using a web-based cloud server data storage. This means the data is available for checking from any place of the world just with the internet browser.

eGate specification is here:
http://www.ev-power.eu/GridFree-Inverters/GridFree-Micro-AC-Direct-Grid-Gateway-AC-230V-CE.html

27.01.2013
 
The Energy Yield from the GridFree Solar Instalation

The Energy Yield from the GridFree Solar Instalation

We have prepared a simple tool to give the estimated calculation of the possible energy production (yield) from a GridFree solar installation of one panel with a microinverter.

Check here: http://www.ev-power.eu/docs/other/GWL-GridFree-EU.xls

Download the XLS and enter your values to get the results of the energy production. The values are entered into the cells marked with blue color.

Across Europe, the solar energy production may vary as follows:

  • South Spain - 1850 kWh/m2 - 267 kWh/year
  • Most of Italy - 1600 kWh/m2 - 231 kWh/year
  • South Germany - 1200 kWh/m2 - 173 kWh/year
  • Amsterdam, Berlin, Warszawa  - 1100 kWh/m2 - 158 kWh/year
  • North of Europe - 900 kWh/m2 - 130 kWh/year

13.01.2013
 
The GF-MAC2000 Low Voltage Grid-Tied Inverter

The GF-MAC2000 Low Voltage Grid-Tied Inverter

Additional reasons why the GF-MAC2000 is better than other inverters:

  • Works as safe voltage from 70V to 120V
  • Multiple string inputs - easier installation + possibility to control the total inverter power
  • Resistant to partial shading of the solar panels

GridFree AC Direct Invertor DC-AC 230V, 2000W CE
http://www.ev-power.eu/_d3301.html

13.01.2013
 
The 2000W Low Voltage Grid-Tied Inverter

The 2000W Low Voltage Grid-Tied Inverter

The innovative product  GF-MAC2000 is a 2 kW DC/AC grid-tied solar inverter. It is a revolutionary product, because it is the first DC/AC inverter on the market to use the low voltage DC input. The GF-MAC2000 is a complete solution for photovoltaic installations with no fear of working with high level DC voltages.

The detailed specification of the GF-MAC2000 inverter
http://www.ev-power.eu/docs/pdf/GWL/GWL-GF2000-Spec.pdf

GridFree AC Direct Invertor DC-AC 230V, 2000W CE
http://www.ev-power.eu/_d3301.html

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 >>

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.

26.12.2012
 
Micro-Inverter –  No Fear of Death

Micro-Inverter –  No Fear of Death

Standard PV installations with work with DC 400V to DC 800V. Total risk of electric shock and death ! ! !  

With Micro-Inverter working with DC 50V – 100% SAFETY - no risks of burns, shocks or deaths because of high DCa voltages.

Make your own solar instalation as safe as possible. Use only low voltage DC micro-inverters.

26.12.2012
 
Micro-Inverter –  No Fear of Fire

Micro-Inverter –  No Fear of Fire

Standard PV installations have high risk of FIRE due to high voltage. DC 400V to DC 800V – extreme risk of FIRE. Bad contact, poor connection or some other fault may cause sparking and cable overheating. The total power of 3 kW to 5 kW is carried in a single cable string for the DC circuits.

With Micro-Inverter the maximal voltage is DC 50V – no risk of FIRE - the power of max 250W is carried on in the DC circuits.

23.12.2012
 
Installation Diagram for the MicroInverters and the eGate

Installation Diagram for the MicroInverters and the eGate

Suggested installation diagram for the full installation of a solar power plant based on the MicroInverter technology.

23.12.2012
 
eGate for MicroInverters - more photos

eGate for MicroInverters - more photos

The detailed internal photos of the MicroInverter eGate.

22.12.2012
 
Question: What is the purpose of the eGate? Must I use it?

Question: What is the purpose of the eGate? Must I use it?

Answer:

1) For commercials installations when the energy is delivered to the public grid the eGate must be installed so that the installation meets the standards of the grid operators. 

2) For small installations (only few MicroInverters)  – when all the energy is self-consumed (in the GridFree mode) and not delivered to the grid – it may not be necessary to use the gateway. However we always recommend applying all possible safety and protection solutions.

Main Safety Functions

Communications Interface with SEDAS web with Web-based online
monitoring per-module

  • Active anti-islanding protection
  • Additional Over/under voltage protection
  • Additional Over/under frequency protection
  • Additional Over current protection
  •    ...more >>

22.12.2012
 
FAQ: MicroInverter Questions and Answers

image

Question: Why do you recommend to use a 250Wp or even 280Wp solar panel with the MicroInverter, that has only 230W AC output power?

Answer: The solar panel specification (250Wp or 280Wp) is the peak power at the ideal condition of direct sunshine at 1000W/m2. On most installations this ideal condition will be present only few days in a year. Most of the time, the sunshine condition of the installation is worse than the theoretical maximum. That is why it is better to use a large size panel to utilize all power available from the MicroInverter. 

The MicroInverter works at the MPPT mode and it will draw only the maximal power up to its own maximal power specification.  This means that during the sunshine peaks the inverter takes only the energy it can process up to its hardware limits.

Hint:  in winter times it may be even possible to join together two (even three) solar panels (of the same specifications) in parallel to increase the real yield from the installation during the short and cloudy winter days.

   ...more >>

14.12.2012
 
Micro-Inverter –  All Panels Supported

Micro-Inverter –  All Panels Supported

All types of panels supported: MONO/POLY/Amorphous/Thin. All sizes of panels supported from 40Wp to 280Wp

With micro-inverters it is easily possible to reuse the “old” panels from other installations. The MicroInverters solve the “solar panels recycling” question.  No need to recycle the solar panels. Even old solar panels can be used again with microinverters to produce electric energy.

With Micro-Inverters it is also possible to combine different type or sizes of panels into one installation.

With micro-inverter you are no more limited!

14.12.2012
 
Micro-Inverter –  More Power from Eeast + West

Micro-Inverter –  More Power from Eeast + West

Combining the EAST and WEST orieneted panels will give you more daily production than from south oriented panels only.

Yield more power with Micro-Invertors and solar panels on EAST and WEST located roofs: Get up to PLUS 38% power

14.12.2012
 
Micro-Inverter –  Multiple Roof Orientation

Micro-Inverter –  Multiple Roof Orientation

Solar panels can be installed on complicated roofs with different orientations.  With Central inverter the installation of such roofs was not possible. With Micro-Inverters the panels will generate maximum energy at any orientation and angles.

Go for micro-inverters now!

12.12.2012
 
Micro-Inverter –  No Fear of Winter

Micro-Inverter –  No Fear of Winter

For normal installation the snow cover on part of the panels will decrease the performance of all solar panels.

With Micro-Inverter the performance of panels will be always maximized. The MicroInverters will give more energy yield from panels partially covered by snow.

Do not be afraid of winter!

Check the Micro-Inverters pricing at EV-POWER.EU

12.12.2012
 
Micro-Inverter – No Fear of Shading

Micro-Inverter – No Fear of Shading

With tranditional PV installation there is huge loss of energy yield caused by partial or full shading. The shading of just part of the panels is a BIG PROBLEM !

Micro-Inverter solution gives more power when panels are fully or partially shaded. There is no big problem with shading any more

With Micro-Inverters the installation is possible in locations where it was not possible with the traditional “central” inverters.

Say NO to central inverters. Say YES to Micro-Inverters!

12.12.2012
 
Micro-Inverter – Always Stable System

Micro-Inverter – Always Stable System

The serial strings of PV panels with one central inverter bring many problems…
if one panel is weak… …the whole systems is weak
if one panel is broken… …the whole system must be stopped

Micro-Inverter works with single panel and is much stable
The problem of one panel does not influence the performance of the other panels.

if one panel is weak… …the whole system can keep working
if one panel is broken… …the whole system will continue to give power

It is easy to replace the broken panel or the defective Micro-Inverter. No need to stop the whole system for long time.

The maintenance of the solar installation with Micro-Inverters is much easier and flexible.

Check the Micro-Inverters pricing at EV-POWER.EU

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.

09.12.2012
 
The Micro-Inverter Safety and Operation FAQs

The Micro-Inverter Safety and Operation FAQs

Q: Can the Micro-Inverter work in off-grid mode (island mode)?

Answer: No. The Micro-Inverter is designed only as the grid-tied (or on-grid) inverter. It works simultaneously (in harmony) with the 230V AC grid.

Q: How will the Micro-Inverter behave when the grid is down?

Answer:  If the AC grid is turned off, perhaps because of fuse is blown, or there is some repair on the cables, the Micro-Inverter will shutdown immediately. This shutdown function is one of the parameters certified by EU standards for electric safety.

The shut-down function means the Micro-Inverter does not produce any electricity when the grid is turned off, even if the solar panels are at full sunshine.

The Micro-Inverter has the anti-islanding function and will not work without the AC grid voltage supplied.

Q: What will the Micro-Inverter do when there is short circuit on the AC power line?

   ...more >>

02.12.2012
 
GridFree technology to reduce your energy demands

GridFree technology to reduce your energy demands

The graphs show the energy consumption and energy self-generation. The green line is the energy taken from the grid. The blue line is the self-produced energy. The more energy is produced, the less energy needs to be taken from the grid.

Save your money by producing more enegry on your own and by paying less to the grid operators.

02.12.2012
 
Micro-Inverter – Panels/Inverters Added Later

Micro-Inverter – Panels/Inverters Added Later

Micro-Inverter solution allows to add more panels easily any time in the future.

This way you can save your money into solar solution. If you have some extra money you can buy more panels.

No need to invest big money at the beginning. Easy way to expand your PV system later.

Check the Micro-Inverters pricing at EV-POWER.EU

02.12.2012
 
36989862801

Micro-Inverter - Unlimited Scalability

The Micro-Inverter solution allows you to start with solar production just with ONE panel. You can increase the size of your installation any time later by simply adding more and more inverters. This is complete freedom unlike the Central Inverter systems where you need “projects” and many paper work.

Start :
… 1 inverter 230W

Go to:
… 16 inverters 3.6 kW
… 48 inverters 3x 3.6 kW = 10 kW
… 96 inverters 6x 3.6 kW = 20 kW
… more and more

Simple way to increase your solar installation. With Micro-Inverter the life of making solar installation is so easy!

30.11.2012
 
Micro-Inverter - An Easy Way with 3 Phase Systems 

Micro-Inverter - An Easy Way with 3 Phase Systems 

Standard solar solution with Central Inverter makes it hard for 3 phase installations. In most cases 3-phase inverters are only for high power installations (5kW and more). They are very big and very costly. They usally do not allow any power balancing between the 3 phases.

Micro-Inverter installation makes is very simple for 3 phase systems

  • No limitation for installing on multiple phases (from 250W per phase)
  • Can be easily designed to reflect the demands of the power on each phase (more inverters on the phase that is demanding more power)
  • Allows simple switching from single phase, dual phase or 3-phase (using AC relay switching box, it is quite simple to make any compination of power or switch from one phase to another)

Check the Micro-Inverters pricing at EV-POWER.EU

29.11.2012
 
Micro-Inveter Opens the GridFree World

Micro-Inveter Opens the GridFree World

Standard energy use (no self-every production)
All energy taken from the grid. All money goes to the grid operator

GridFree installation
* Part of energy supply is self-generated.
* Only part of energy is taken from the grid.
* Self-generated energy is NEVER given to grid.

The purpose of the GridFree is to reduce the power consumption from the grid by means of self generation of the energy.  This is not an off-grid concept. At the GridFree installation the connection to the grid remains and a part of the energy is always taken from the grid, especially in times when there is no self-generation (e.g. at night for PV installations or in cloudy winter days.)

Check the Micro-Inverters pricing at EV-POWER.EU

28.11.2012
 
What is Micro-Inverter?

What is Micro-Inverter?

Micro-Inverter is an innovative solution for solar installations. It directly converts the DC voltage solar power from PV-panels into standard AC grid voltage (230V/50Hz). The micro-inverter is usually mounted directly at the solar panel. The input (DC) is 20V to 50V.  The power of micro-inverter is usually 250W. (The inverters bellow 1kW of power are in general called micro-inverters).

There are many good reasons why to use the micro-inverter at the photovoltaic installation.

Check details about Micro-Inverters (and Mini-Inverters) - http://www.ev-power.eu/GridFree-Inverters/

Check the specification: http://www.ev-power.eu/docs/pdf/GWL/GWL-MAC230A-Spec.pdf

19.11.2012
 
Solar cable 5m with MC4 connectors

Solar cable 5m with MC4 connectors

Ideal to connect solar panels (in series). Also one cable can be cut into two open-end cables to get the MC4 termination for solar regulators.

22.10.2012
 
The GridFree MicroInvertor GF250 details

The GridFree MicroInvertor GF250 details

The GridFree MicroInvertor is converting directly the DC power input from solar panels into 230V grid-tied AC output to feed the energy into the grid.

16.07.2012
 
GridFree direct energy conversion 1 hour => EUR0.04

GridFree direct energy conversion 1 hour => EUR0.04

At peak sunshine hours one solar panel size 2x1 meter produces 200Wh of clean energy to feed the AC grid. With pricing of EUR0.20 per kWh, the panel generates EUR0.04 per hour.

16.07.2012
 
Hybrid Grid-tied Inverter - another key component for GridFree

Hybrid Grid-tied Inverter - another key component for GridFree

Hybrid grid technology allows to store energy into the batteries and generate energy simultaniuosly with the grid. The hybrid grid inverter works both in grid-tied mode and also in the grid-off mode. Check with us for more details. 

16.07.2012
 
Micro Inverter technology helping to built GridFree solutions

Micro Inverter technology helping to built GridFree solutions

The microinverters (micro invertors) are the key components to allow the local low cost energy generation. They work simultatiously with the AC grid and give you the power to produce the electric energy with an extreme simplicity. Just plug in and you have your own power generator.  Check with us for more details.

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 >>


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