 These pumps can either be a pedestal or submersible pump or have a direct current motor. The pump is powered by a battery pack that is continually charged by a battery charging unit that plugs into house 120-volt electrical system. Many of these back-up pump systems come with an alarm system that sounds if the back-up pump is being used or the battery is not charging properly.
The manufacturers recommend the batteries be replaced every two years. This could be a problem if the homeowner forgets to replace the battery. The batteries usually have a continuous run time of seven to 10 hours which should be plenty of time for the electric utility company to turn power back on.
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