I've been working with a company to figure out what it would take in solar panels and batteries to run the essentials in an emergency. Because I'm in a heavily treed town there isn't anyplace which would get full sun all day so they've estimated it would take 24 panels to completely power my home. Obviously, I can't afford that many and it would a bit silly to have that large an array in town.
What I've been working out is what I want to be able to run all the time. I've come up with the refrigerator, freezer and furnace. I can live without hot water and have alternatives for cooking. A couple fans would be nice but not necessary; likewise the computers.
So, that's basically it. Now all that's left is to see if they can make it work.