Any "MARINE" inverter will have an automatic transfer switch. If it is not a marine
unit take it back get your money back and get a marine
unit. There are several reasons for this safety
being the biggest. You cannot simpley tie into your present shore power system without knowing what you are doing or you could hurt or kill someone. You also need to understand you loads and useage. I recomend you hire a ABYC certified tech to at least consult with you on the installation
. You do not want to fool around with 120 VAC if you do not know what you are doing. Inverters need there own neutral buses, they need to be seperated from redudant loads and heavy loads like battery
chargers and water
heaters. I strongly urge you to get some help from a professional on this one.
Wayne Canning, AMS