For your fridge I would check your breaker panel for 110. Does it work on the propane side. When you first plug them in they can take hrs. before they start to get cold. If your water heater is gas/elect. there is a litlte rocker switch on the tank you have put to elect to get it to work on electric. Make sure there is water in the tank or the element will burn out very quickly. That also may be your problem, the element may be burned out. Does it run on the propane side? The a/c is like said above they need more than 30 amps for both to run. Good luck.
Dennis & Marcie & Hook The Jack Russell, 2001 HR Imperial 38wds 350 Cummins, 07 Chevy Trailblazer/Blue Ox/Ready Brake, 04 Dodge 3500 Cummins,