I have a 30 amp plug, never had a problem, I can run both air, and the mircowave, you just dont put them on the same circut. the lights are never a problem they are all 12v and work with the converter when you are pluged ing, when you pull the plug they run on the house battery, if you want you can then plug it into a inverter to run the whole bus, but like it has been said you need one big ass battery bank, its really not fesable, I just plug into my genny and off I go, if I need to Ill run it to have a\c while driveing, if we boon dock I have a 1000 watt inverter I can use for tv etc, I can run about 1 1/2 hours with tv and sat before I have to start the gen to charge the house battery, I only have a reg car battery for now, and will get a deepcycle for the house battery this summer, the it will last longer. if need be a I can run the gen to use the microwave, but I do have a propane stove/oven, and the fridge is propane.
here is a link to bestconverters this is the place for info and converters
http://www.bestconverter.com/
gbstewart