Just about all home UPS systems run off a 12V battery. A 12 Volt battery is a 12 volt battery -- if it fits in the palm of you hand or weighs 80 pounds and has the power to start a DT466 diesel engine on a cold winter morning, it still just puts out 12 Volts (nominal). A lot of people with aquariums run a UPS connected to a car battery to keep heaters, lights, pumps, etc running when the power fails. You can basically use any 12V UPS; remove the small battery and run leads to the large battery. You could run a STB, sound system, and a large plasma for quite some time with the proper set up . . .
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