What size power station do I need for Sump pump?
Sump pump
Default appliance profile before model-specific measurements.
Using the supplied baseline estimate, the sump pump represents about 600 Wh per day: 800 W running demand, 1,600 W startup demand, 3 hours of operation, and a 25% duty cycle. A one-day battery target is approximately 871 Wh nominal capacity, based on 88% inverter efficiency, 90% usable capacity, and a 15% reserve margin.
The estimate carries ±35% usage uncertainty before model-specific measurements. Actual consumption can vary by appliance model and conditions; a plug-in power meter or manufacturer energy label is preferable when available. The inverter should cover at least the pump’s 1,600 W startup demand.
- Capacity: Choose at least about 871 Wh nominal capacity for the modeled one-day target; the supplied table lists 1,000 Wh as approximately 1.3 default-profile days.
- Output: Confirm that the inverter can handle at least 1,600 W of startup demand, in addition to the 800 W running estimate.
- Uncertainty: These figures are baseline estimates, not model-specific measurements; the evidence is insufficient to predict exact runtime for a particular sump pump.
Using the default load profile, sump pump consumes about 600 Wh/day. A conservative one-day battery target is about 871 Wh nominal capacity, while the inverter should cover at least 1600 W of startup demand.
Assumptions behind the calculation
- Running draw: 800 W
- Startup/surge: 1600 W
- Default use: 3 h/day
- Duty cycle: 25%
- Usage uncertainty: ±35% before model-specific measurements
Actual energy use varies by appliance model, ambient conditions, settings and load. A plug-in power meter or manufacturer energy label is preferable when available.
Runtime by battery size
| Station capacity | Continuous-draw runtime | Default usage profile |
|---|---|---|
| 300 Wh | 0.3 h at continuous draw | 0.4 default-profile days |
| 500 Wh | 0.5 h at continuous draw | 0.7 default-profile days |
| 1000 Wh | 1 h at continuous draw | 1.3 default-profile days |
| 1500 Wh | 1.5 h at continuous draw | 2 default-profile days |
| 2000 Wh | 2 h at continuous draw | 2.6 default-profile days |
| 3000 Wh | 3 h at continuous draw | 4 default-profile days |
Use your actual household loads
The calculator combines this appliance with refrigerators, networking, pumps, medical equipment and other essentials so simultaneous wattage and motor startup are not ignored.