What size generator do I need for sump pump?
Check, uncheck or adjust the typical device list below — watts, startup surge and battery size update instantly. Numbers come from U.S. DOE, ENERGY STAR and manufacturer spec sheets, not marketing copy.
1. Check what you need to power
Refrigeration & Freezers
Kitchen
Heating, Cooling & Fans
Water & Pumps
- 1
Laundry & Cleaning
Electronics & Office
Medical Devices
Power Tools & Outdoor
Lighting
2. Your sizing
Assumptions: daily hours per device follow DOE / ENERGY STAR duty cycles; capacity adds a 25% margin. Check your appliance nameplates — actual draw varies by model.
3. Best matches from our 6-brand database
- EcoFlow DELTA 3~$599
- rated 1,800W covers your 1,210W continuous load
- surge 3,600W covers your 3,300W start peak
- 3.1 days of your typical daily use (1,024Wh / 330Wh)
- EcoFlow DELTA 3 Max~$899
- rated 2,400W covers your 1,210W continuous load
- surge 4,800W covers your 3,300W start peak
- 6.2 days of your typical daily use (2,048Wh / 330Wh)
- Jackery Explorer 2000 Plus~$2,599
- rated 3,000W covers your 1,210W continuous load
- surge 6,000W covers your 3,300W start peak
- 6.2 days of your typical daily use (2,043Wh / 330Wh)
Static answer (crawlable summary)
Typical device list: Sump Pump (1/3 HP)×1.
Estimated from: Mfr spec: Zoeller M53 (FM2778)
| Continuous load | 1,100 W |
|---|---|
| Startup peak | 3,300 W (driven by 1× Sump Pump (1/3 HP)) |
| Daily energy use | 330 Wh |
| Recommended capacity | 420 Wh (25% margin included) |
| Minimum inverter | 1,210 W continuous |
Frequently asked questions
What size generator do I need for sump pump?
For a typical setup (Sump Pump (1/3 HP)), you need at least 1,100W of continuous power. The single biggest moment is startup: when 1× sump pump (1/3 hp) kicks on, the momentary draw peaks at 3,300W. For a full day of runtime we recommend at least 420Wh of battery capacity (your devices use about 330Wh per day, plus a 25% margin for a full day of use).
Which power stations can handle this?
Based on published specs, EcoFlow DELTA 3, EcoFlow DELTA 3 Max, Jackery Explorer 2000 Plus cover the 3,300W startup peak and deliver 3.1 days / 6.2 days / 6.2 days of typical daily use. Check the comparison cards above for the full numbers.
Why is the startup surge higher than the running watts?
Motor-driven devices (fridge compressors, well pumps, air conditioners) draw 2-5× their running power for a split second at startup — measured as locked-rotor amps (LRA). On this page the biggest spike comes from the Sump Pump (1/3 HP): a station that only meets the running load will trip or stall when it starts. Data sources: U.S. DOE Energy Saver, ENERGY STAR certified products, manufacturer spec sheets.