Saturday, January 2, 2021

Re: [electricboats] Paralleling LiFePO4 battery packs

Hi Mohammad,

You should not need a separate BMS but the functionality you will achieve does depend a little on the capabilities of the BMS. Many will have a coms protocol you can use to inform the BMS that it is in parallel and often will allow linking via a cable, so that you can manage the unit as one. The powerwall style batteries I used support this. 

Regards,
-Ryan

On Jan 2, 2021, at 10:51, mmiri@sfu.ca wrote:

Hello dear friends,

I have a 20kW electric motor for my 40ft sailboat and now I want to get the Lithium batteries (LiFePO4). The battery packs that I found are 48V200Ah each so I would be putting 2-3 of them in parallel (since the MAX discharge current is about 150A each). Note that Each pack has its own BMS. Now my question is that if I want yo parallel these individual modules (with each having their own BMS) do I need a master BMS for the whole pack (2-3 parallel modules)? If yes, how should I implement it? What do you recommend?
Thank you all in advance!

- Mohammad

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