get a battery backup system I recamend a upc 1500 or larger and run return pump, one heater and your skimmer onit and that is all you want it to last as long as posible. I get about 2-3 hours out of mine with a new set of bateries. You could get away with out having your skimmer on this unit and everything will work for longer and if you wanted to float hot water bottles all you would need to have on this unit is the return pump which would increase the amount of time you can run the upc for. Also good for winters and power failures they kick in right away on interuption in operation of equipment. The upc also acts like a isolation transformer.
Bill