I am trying to clarify the true purpose of the 2nd 120V output. I see many explanations that say the 2nd AC Output is used to supply the second leg of a 50A RV. While you can do this, I think this can happen with or without the the 2 x 120V option?
In reading the manual, I believe I understand the following:
1.) In both passthrough and assist, power will be supplied to both L1 & L2 of AC - OUT 1. If input is single phase, L1 and L2 will be joined.
2.) AC - OUT - 2 is only passthrough and never power assist. So the main purpose is to isolate some circuits that can never draw from the inverter / batteries.