Blog - BMS Systems

Battery bank

04.Jun 2014
| Blog - BMS Systems

How to make 12V 400 Ah battery bank?

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You should use 4x 400Ah LiFePO4 cells to acheive 12V battery pack.

http://www.ev-power.eu/Winston-300Ah-1000Ah/WB-LYP400AHA-LiFeYPO4-3-2V-400Ah.html

Proposed cells have total capacity 4.8 kWh which is ideal for delivering continuous power up to 2 kW. Remember that such a battery can stand much higher discharging currents (continuous 4.8kW at 1C, peak 14,4kW at 3C, during short bursts it is even more).

First of all, the battery should contain some kind of cell protection or at least monitoring equipment installed.

BMS options:

1. GWL/Power Cell Logger 8 cells

Unless you have something else for battery protection this device is fundamental. It will tell you everything you need – each cell voltages. Cell logger contains alarm output which can be used to disconnect charger or load when any cell goes out of given limit. Here are some details of such an installation:
http://gwl-power.tumblr.com/tagged/CellLog

2. GWL/Power Simple Battery Management Board 4 cells (12V/10A)

This device has already the function of disconnecting the load (or charger) build-in (when any voltage falls outside limits). Since current rating is only 10A we will need to install external contactor: http://gwl-power.tumblr.com/tagged/SBM

3. GWL/Power BMS123

This is supposed to be one of the most sophisticated systems that we offer. More information can be found here: http://gwl-power.tumblr.com/tagged/BMS123

Since customer needs to utilize 2 kW of solar power we need to use two eTracers 60A solar charge controllers as the maximum charge power will be about 1700W (14V * (60A+60A)). We suppose that solar power 2 kW is peak rating so that 1.7kW of real charging power will satisfy the needs.

In case such a system was designed from scratch we recommend to use 24V as a system voltage (only one charge controller needed).

List of needed products:

Products will be connected by attached schema.

230V inverter and solar charge controller will be connected “after” contactor so the contactor is able to disconnect it.

Please see other related informations:

BMS sections at our web page:

http://www.ev-power.eu/BMS123-System/
http://www.ev-power.eu/SBM-CBM-1-1/

Solar charge controllers section at our web page:
http://www.ev-power.eu/Solar-GridFree/

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