That's what I would figure too. It's still an interesting device.
I thought about doing what the OP was originally looking at but decided I didn't want to leave the wife to deal with it if I'm stuck at work. In the end I went big and got a 22kw Generac whole home natural gas generator. That way if the power goes out and I'm away the wife doesn't have to do a thing. I'm very happy with my choice and for some reason my neighborhood loses power a few times a year and we only know because the oven clock will be wrong. It is a very nice luxury to have.