History: I built a 16s battery for my Growatt using an Overkill 100 amp BMS and 230 amp EVE cells. It works wonderfully but I wanted more capacity so I purchased another 16 of the same EVE 230 amp cells. I also picked up another BMS, Class T fuse holder, shunt, the whole enchilada...with the intention of building another identical battery and then paralleling them at a common point. I'm familiar with the critical importance of resistance and cable lengths when hooking up battery strings in parallel but my experience in doing so is with lead batteries and it just never seems to work as intended. Maybe Lifepo4 behaves better in this scenario? I don't know.
Dilemma: Having two separate batteries each with their own BMS has the advantage of redundancy but I run the risk of uneven load sharing. Building one big 2p16s battery eliminates that problem and does simplify the build considerably, but I will lose the redundancy and the ability to monitor each and every cell as an individual. I'm looking to the group for thoughts yay or nay either way and realize there is no absolutely right or wrong answer. Also worth noting, these batteries will spend most of their life floating around 95% SOC as I use this for a whole house UPS and don't regularly cycle them. I may get some panels in the future and exercise the Growatt daily depending on how the future of net metering and electric prices play out, but that's not in the plan for now.
Dilemma: Having two separate batteries each with their own BMS has the advantage of redundancy but I run the risk of uneven load sharing. Building one big 2p16s battery eliminates that problem and does simplify the build considerably, but I will lose the redundancy and the ability to monitor each and every cell as an individual. I'm looking to the group for thoughts yay or nay either way and realize there is no absolutely right or wrong answer. Also worth noting, these batteries will spend most of their life floating around 95% SOC as I use this for a whole house UPS and don't regularly cycle them. I may get some panels in the future and exercise the Growatt daily depending on how the future of net metering and electric prices play out, but that's not in the plan for now.