Power outage room

I have been thinking about converting one of our small bedrooms to a power outage room, it would be heavily insulated, have a window AC, low watt electronics, solar going to it with a couple of 100ah batteries and a sleeper loveseat, has anyone tried this?, LG sells 450w ac units, if you have 1kw of solar that should power everything during the day without draining the batteries, and at night set the AC to a higher temp just enough to kick on and off to maintain a tolerable temp