A lot of the questions about batteries are related to changing the old battery for the new one, or building a new project as building the electrical system on board.

The optimal solution for this case is to use LiFePO4 cells which are suitable for electric boats, cars, and other EV applications. It is due to the LiFePO4 technology is safe and there are long lifetime and thousands of charging cycles.

The most common voltage for the sailing yacht is 12V. Capacity always depends on the consumption of energy and expectation of functioning without the funds from the generator.
One of the most popular battery packs is 12V 400Ah. To achieve 12V battery is needed a serial connection of four 3,2V 400Ah cells.
https://www.ev-power.eu/_d1706.html

More information about battery banks and LiFePO4 advantages:http://www.ev-power.eu/BatteryPacks/ 
You will also need a LiFePO4 charger for 12 V battery banks and monitoring and protection equipment.

On the link below you can find the BMS123 
https://www.ev-power.eu/_d4493.html
And here is information about GWL/CPM
https://www.ev-power.eu/_d7077.html

It is necessary to use the protection of the battery bank by using a DC contactor at the power cable to motor to work as the main switch for the high current application.


Components for 12V battery block:

https://www.ev-power.eu/_d7051.html

https://www.ev-power.eu/_d6931.html

https://www.ev-power.eu/_d4818.html

More information about  the topic you can find in our brochure USE OF LIFEPO4 BATTERIES IN SHIPS
https://www.ev-power.eu/boats/

Expansion accessories that can be used:
https://www.ev-power.eu/_d5134.html

https://www.ev-power.eu/_d6620.html

https://www.ev-power.eu/_d5055.html

If you will have some more questions, please contact us.