Path-Q Solar
Can a battery support a sump pump without draining too quickly during a storm?
Answer
It can if the battery and inverter are sized for the pump's starting surge and the expected pump duty cycle, but runtime may be much shorter than expected during heavy inflow. The assessment must use pump energy per cycle, likely cycles per hour, battery usable energy, inverter losses, and a plan for prolonged storms.
Key points
- Use the pump's running and starting specifications and measure or estimate actual run time during severe conditions.
- Account for inverter efficiency, reserve settings, and other simultaneous backup loads.
- Consider a second pump, alarm, generator, or other contingency if basement flooding has high consequences.
What it depends on
- Pump horsepower, starting surge, and duty cycle
- Expected water inflow and storm duration
- Battery usable energy and inverter power
Risks and trade-offs
- A pump that runs continuously can exhaust a battery rapidly.
- An inverter that cannot start the motor may leave the pump unavailable even with stored energy.
- Oversizing the battery may cost more than adding a separate long-duration backup measure.
Information you may need
- Pump and backup-pump specifications
- Observed or conservative storm duty-cycle estimate
- Required minimum runtime and other critical loads
Your next step
What to do next
Request a storm-runtime calculation using a conservative continuous or high-duty-cycle case and verify the pump's starting compatibility with the proposed inverter.
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SQ02772