Here's a back-up idea that will work in an emergency and isn't too expensive: Get a power inverter designed to work off your car battery. They come in 250W & up -size it to the equipment you need to run in an outage. Get one that has clips that connect directly to your auto battery terminals (not the one that works thru the cig lighter only). When the power goes out, you hook it to the car battery, start the car, and plug in an extension cord to the unit's AC
plug and then to your pumps (or perhaps a small heater) & you're good to go. So you're basically using your car as a generator (keep the car outside, not your garage!). If it's cold you need to figure out a way to run the cord into the house without creating a huge draft and losing heat. I ran mine thru a small window and used painter's tape to close it off. To keep heat in the tank, consider buying a few quilted mover's blankets (very cheap) to cover the tank to reduce heat loss a little bit. Of course these ideas require you to actually be there to take action in the event of a power loss, and in some areas it might not be a good idea to have an unattended car running all night. If you are a boater, you may have deep cycle marine batteries at your disposal. Unlike car batteries which are designed for high amp starting power, these provide longer continuous power. They can be linked to form a bank and an converter can turn them into a DIY UPS.