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I purchased (and recently received) 16 x 3.2v 320Ah cells. I'm building a 21KW (probably bigger...) solar array and the storage system I am going to go with would be 2 sets of 16 x 3.2v 320Ah cells. I want 2 x 48v 5Kah banks in parallel. Where I am at now is I need a BMS for both (if possible)...

I have built SEVERAL 3S7P 18650 battery packs, mostly for a pair of APC UPS's. I buy the battery boxes as a kit from Ali Express. The kits themselves are decent and the materials are pretty good. They can come with a 20A (or so) BMS. I put together around 30 of these about 12-18 months ago where...