if you really want to do it this will work
about 4 golf cart batterys, and a 4000 watt inverter and a good charger to keep it up when you have power or a genny on, but this will cost you a good chunk of $$$$$$ you could buy alot of gas cans or a big gas tank like they use around a farm and be cheaper than the inverter/battery set up
this is common palce in the RV world, but its only as a back up, as in your gen set breaks down or runs out of gas, or the power goes out in a campgrond and you dont want to start your gen set. i have honnestly never ran my batterys dead on an inverter, in fact i think its a waste in the motorhome, i would just fire up the gen set but without running the A/C or microwave it worked great to power everything else, cound of run 1 a/c not 2 on it but never have tried