As the instructions make clear, this transfer switch is positioned for use in RVsor for powering boats on shore or off. I wouldn't know the details of that because I have neither.What I need is a transfer switch that powers a sump pump from either AC house power or frommy inverter running off of a bank of batteries. The message here is that this is that transferswitch. You just have to decode the instructions written for RVs and boats into this sump pump application.And of course, if it works for my sump pump, then it works for RVs and boats.Also, by the way, the inverter I am using is also from Go Power! and I am very happywith it as well. It did a great job for me when Hurricane Sandy knocked out my powerfor 11.5 days.