Sump Pump Battery Backup: What to Know Before an Outage

A battery backup sump pump keeps basements dry during exactly the storms most likely to also cause a power outage — flooding risk and grid outages tend to spike together in heavy rain and hurricanes.

Battery backup systems are sized by how many gallons per hour they can pump and how long the battery lasts under load — check both numbers against your sump pit's typical inflow during heavy rain, not just its rated capacity.

These systems supplement, not replace, your primary sump pump — they're built to bridge an outage, not run indefinitely.