If I were going to do it today, I would get a Tesla type wall battery system and have a multi fuel generator to recharge it when power is out for along time.
They are expensive and picky on how they are charged. Generac on natural gas is actually a LOT less expensive.
Sure, there are incentives from Uncle Sugar but I just don't feel they are competitive yet. I used to want one of them with their Solar Shingles but the shingles never panned out.

