said by ke4pym:
If I wanted to put in a battery system (which is an option, but I don't have a suitable place to store the batteries or want to put up with the expense) I could run from that at night if the power was out....
Don't bother, it's not worth it. Batteries have a life of 3 years, 5 if you're extremely lucky.
Powering only 1000W for 4hrs will require some 4500Wh from batteries.
A single typical 12V/60Ah deep cycle battery gives 720Wh at low drain. You'd need a bank of ~10 such batteries to sustain the load for 4hrs. Given the cost of $125-ish for a single battery you'll be better off running a small generator in the event of an outage.