How big of a battery would.... How big of a battery would it take to power the average sized home for 24 hours? Considering basic kilowatt-hour consumption with AC. Would it even be possible to power a home off a DC source? I would hypothesize that you would have to change all of your existing AC appliances to DC. Which would take some serious work. Just a question I have had for a while. P.S. If you view this, please leave an answer.