the only way you are going to be able to power all that for an extended time is to buy a bunch of bateries and build your own back up. to run everything you listed for 1 hour you are going to need 114amps of 12V power. if you buy a good deepcell battery say 245AH then you will get a little over 2 hours out of it, so 6 of them will give you 12 hours of running. if you only use your 250 watt heater you would only need 368ah to run for 12 hours so you could get by with 2 batteries.
so you would also need a good trickel charger about 30 bucks, a 700 watt inverter about 50 bucks and some sort of change over.
a more simple way to do it would be to get a 45amp converter from a RV and set it up to charge the batteries and run thoes thing of an inverter all the time, this way when power goes out nothing changes. would probably cost about 600.00 to buy the stuff, using real good quality batteries.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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