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Newbie: building a 280ah 12volt with potential to expand to 560? Cell differences?

mikeinmlb

New Member
Joined
Feb 18, 2021
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9
Hi everyone:

I am in the process of planning a build out for my RV.

I am looking out to build out a 280Ah battery pack. The question I have is that there is room around the battery box to add some additional cells in the future.
I think I want to build 280Ah with the potential to add an additional 280Ah in the future.

So here are my questions:

From what I can tell, I should wire each of two cells in parallel and use a single BMS lead per two pack. Does this work if I want to rebuild the 4 cell pack to have 8 cells in the future?

I would need to split the system between two battery boxes. Is that an issue with just having a wire between the two 6 volt packs?
 
It works, but you're better served by have 2 complete 4S batteries with their own BMS in parallel. The BMS is typically the current limiter, and having two in parallel permits higher currents. You also have redundancy. If a problem develops with one battery, you can simply disconnect it, and there is in interruption.
 
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