I would not use any power other than the convertor when using the 15/30 adapter. very poor connections. The convertor runs a couple amps ( mine is a cheap one that came with the unit) and if you turned on the refer you add about 3 amps. That would be all I would use. No air cond, micro, water heater. Recently I spent about 2 hours finding why a friends GFCI was tripping and found out the waterheater element had a slight leakage to grd. Had to remove both wires to allow MH to be plugged into the house gfci outlet. Those gfci outlets are there for your safety. Don't work around them.