Zer0
is back to save the day!
Theres nothing on the market besides a gas powered GENERATOR that will keep your things powered for more than 4 days. I would just have to chalk it up to bad luck if you have another power outage like that. What you could do though.. is wrap your tank in tin foil. Sounds kind of desperate.. but wouldn't you be if you had fish to worry about? The tin foil will keep the heat in.. but idk about the filtering and all. Maybe you should start building up an army of hamsters that run on a big wheel that can power your things for you. Just a thought..