So I was running numbers trying to calculate how many 18650's and which config I need to get 8 hours of battery runtime (500 Ah x48 v = 24 kWh)for my whole home. Using harvested laptop batteries and assuming the lowest capacity will be 2200 mAh I'd need a 13s229p config (about 3000 cells). I imagine putting 229 cells together is not recommended or even physically sensible, so how does one configure a 48 v,24 kWh 18650 based battery?