The Amp hours needed to power an aquarium heater would drain any sump pump battery in minutes
My tropical aquariums over the years have weathered multiple power outages without problems or anything more than a blanket wrapped round them and some styrofoam insulation, but I don't believe they've ever dealt with anything longer than 12 hours. Water has a high heat capacity, which means it cools much slower than air and a short power outage doesn't do too much harm to the average freshwater tank - unless it has been overstocked. Then aeration becomes a big deal and backup aeration is essential. I couldn't find a battery-operated pump when I had fish, which is why I didn't use one. I haven't kept marine, but wouldn't be surprised if they were more sensitive. You've many good ideas here. I think I'll try to find a mylar blanket for my lizard tank. I already have heat packs for her.
Without water movement, your corals and fish could start to die in as little as four hours. While some aquarists have resorted to using computer-style back-up batteries, these batteries are bulky, heavy and designed for keeping computers and equipment running for only a short time.
Where to buy a battery powered aquarium heater..
Battery operated heater??? [Archive] - Aquarium Forum
Anyone who needs to run more than a filter/airstone and heater during a power outtage should probably consider investing in a portable generator that automatically starts up when there is an outtage. The Amp hours needed to power an aquarium heater would drain any sump pump battery in minutes. Yes my degree is in reusable and solar energy / Energy management. The thing your tank needs the most is air. Your fish consume oxygen and produce carbon dioxide. Most of the oxygen enters the aquarium (and co2 leaves the aquarium) by gas exchange at the water surface. The excess co2 gasses off into the room and fresh oxygen enters the water. With good air exchange the aquarium reaches equilibrium with the levels in the air around the tank, and for the most part, doesn’t vary too much. Good air exchange is the result of good flow in the tank and agitation at the surface of the tank. When the power goes out, so does most of your gas exchange. This isn’t a huge issue for most aquariums if were talking about a short period of time, but the sooner you can get that water movement and surface agitation back up and running the better. A battery powered air pump is one of the things that should be in everyone’s kit. They are inexpensive and can save you a boatload in the event of a power outage. At around the $20 range they are probably cheaper than any piece of livestock you have in your tank. They generally come in two different flavors, automatic and manual. With a manual battery powered air pump like the , you put batteries in the air pump and it starts pumping. The batteries are its only power source. Simply submerge the end of the airline tubing down in the tank and let it bubble. As the bubbles rise to the surface they will not only produce some movement of water in the tank but they will cause ripples on the water and agitate the surface of the water, promoting air exchange. Not only a life saver in the event of a power outage, but the is a great option for long rides home from the fish store or frag swap. Properly used, this kit should keep your tropical aquarium or reef tank warm and aerated for several days. More heat packs and more batteries will allow you to keep it warm and aerated even longer.An aquarium heater uses a lot of power. Something with AA batteries, expect about 15 mins before it kills the batteries. A car battery might last a couple of days, but thats not exactly practical.