On my 30a rig, I put in a 2000W inverter, with a built-in xfer switch. I put a 30A plug on the inverter input, I put a 30a receptical on the original rig xfer switch. Plugged them together. I put a 30a receptical on the inverter output, and a 30a plug on the feed to the main breaker. Plugged them together. The entire rig is then fed from shore power, generator, or inverter. Hair dryer, curling irons, microwave, coffee pot.....you don't wanna be stupid enough to run the AC from the batteries, but you can. You can also drop the inverter from the system easily if you need to.
