What size battery backup do I need for a sump pump?
What size battery backup do I need for a sump pump? Purchase a battery with an AH rating near the maximum recommended by the backup sump pump manufacturer. Typically, it will be around 120 AH. If the primary battery runs down in an emergency, a standard vehicle battery can be used to provide power to the backup sump pump. Do you need a backup sump pump if you have a generator? Portable Generators For longer outages, even your battery backup sump pump won't help. In these instances, you need a portable generator to restore power. With enough fuel, a portable...