So we have a sailboat with two separate 110VAC systems. They have separate plugs for shore power. One has a Multi-Plus 2000VA inverter feeding much of the system. We are installing a Multi-Plus 3000VA inverter on the second system. My question is that since BOTH systems can be fed from the onboard generator, if we leave the selector switches for both systems on the generator selection, is it possible to backfeed one system from the other? Can they get in a phase add situation and cause high voltage? Are there any other failure modes I am not thinking of?