Sunday, January 3, 2021

Re: [electricboats] Paralleling LiFePO4 battery packs

I don't think you need another bms, but make all your cables exactly the same length or you will have uneven discharge problems


On Jan 2, 2021, at 7:51 PM, 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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