When I need AC power, I turn on the inverter and then plug my AC device into the socket on the inverter. It is a small inverter -- less than a thousand watts -- and I use it mostly to charge phones and stuff like that.
I turn off the inverter when the phone is charged -- the inverter would otherwise create a small power drain on the battery.
Let me know if that does not answer the question -- maybe I am missing something.
2012 Fun Finder X-139 "Boondock Style" (axle-flipped and extra insulation)
2013 Toyota Tacoma Off-Road (semi-beefy tires and components)