I have a MultiPlus-II 12/3000/120-50 2x120V installed on my RV. On shore power the full power comes thru on both L1 and L2. When I start the generator, I only get half of the generator’s power thru L1. L2 shows on the GX Touch being there on the input but not on the output. Is there something wrong with my MultiPlus or is a setting wrong? I do know that the generator supplies 22A @120V on each leg, but the legs are not out of phase.
There’s the issue, the 2x120 only passes through split-phase power. If your generator is not supplying L2 at 180 degrees out of phase from L1, the MP-II will reject the L2 input.