disregard

Welcome to the forum Claywd,

I see that you have probably figured out what went wrong?

The first issue is that, usually, for a LiFePO4 battery with BMS (?), typically the maximum current you can draw is around 1*C (1 x Battery AH capacity) or for your 20 AH battery, that would be 20 amps @ 12 volts per battery

• 20 amps * 12 volts * 0.85 AC inverter eff = 204 Watts @ 120 VAC max... Or ~4x for four parallel batteries (getting equal sharing is not alway easy)

Anyway, please feel free to start a new discussion if you want to work on your system design....

-Bill