Blog - LiFePO4

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

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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

There is need to use protection of the battery bank by AKUMON which measure the voltage at battery terminals and control by DC contactor at the power cable to motor to work as the main switch for the high current application.

You will need following products:

4x   3,2V 700Ah LiFePO4 cells

1x 12V 100A LiFePO4 charger

1xDC Power Contactor 200A, Coil 12V

1x Akumon A2 - 12V LFP battery management board

1x BMS123 OFFGRID - Main Controller

1x BMS123 - Cell Module IN

1x BMS123 - Cell Module OUT

2x BMS123 - Cell Module

1x BMS123 - Current Sensor 200 Amp

1x BMS123 - CURRENT meter

1x BMS123 - FUEL meter

3x Terminal connectors

8x Terminal cover - black

8x Terminal cover - red

Copper Cable RADOX 35 mm Shielded HS84100296

These products will be connected by attached schema.

There is also possible to use instead of BMS123 cheaper solution without status information the SBM board to manage the voltage levels.
http://www.ev-power.eu/SBM-CBM-1-1/Simple-Battery-Management-Board-4-cells-12V-10A.html
See also this: http://gwl-power.tumblr.com/tagged/sbm
There is also possible to use the CELLLOG to see the voltage levels:
http://www.ev-power.eu/Measure-Test-Tools-1-1/Cell-Logger-8-cells-1-battery-USB-port.html
http://gwl-power.tumblr.com/tagged/CellLog