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I'm in the planning stages for a 48 V on/off-grid system for backup at home. I was given 2 kWh of brand new LiPo cells from my employer (they'd purchased them for a project that we never ended up doing). I know LiPo isn't the best for this, but they were free, so... I'll use them for now and...

I'm putting together a 13S4P lithium pack, as shown: I'm experienced enough and comfortable enough to figure out the wire sizing for all the solid-colored wires in my diagram, which are meant to carry the load. However, the BMS needs to be able to measure the voltage of parallel groups of cells...