I think you are right, it reset itself. I have tried to reset the voltage cut-off, but it is not letting me. I tried to do the following: Hold enter for 3 seconds. Press down till you get to setting 5 Battery Type. Press enter. Press down to change to USE (user defined) - I can't go into USE...
I have a Sunmagic Hybrid Solar Inverter and just replaced my two batteries with the exact same batteries (24Volt setup). The problem is that previously I was able to run my lighting for four hours minimum, and now am getting an hour and a half before the low battery voltage cuts out. Could it...