Several...
Search battery hookup, and batterywarehouse
Basically, we are starting to think the batteries have VERY few cycles left in them, and are getting approximately 50% of original rated storage...
many have very weak cells in thepack, needing breakout, and swapping to get a full charge - discharge cycle...
nobody is getting 4.5KWh out of them... some aren’t getting 3KWh out of them... and the banks were originally rated at 5.5KWh.
my 4 have yet to achieve 3.4V per cell sustained... so the 18KWh I purchased is at best capable of 12KWh, and I think more like 10... and when new, the set should have put out 22KWh... so LESS than 50% left... which puts them HEAVILY cycled, likely over 20,000 deep cycles... so the cells likely will all fail soon...