What size generator do i need for a well 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
- 1
Kitchen
- 1
Heating, Cooling & Fans
Water & Pumps
- 1
Laundry & Cleaning
Electronics & Office
Medical Devices
Power Tools & Outdoor
Lighting
- 4
2. Your sizing
3. Best cross-brand matches
- Anker SOLIX F3800
- surge 9,000W covers your 8,612W start peak
- 1.5 days of your typical daily use (3,840Wh / 2,565Wh)
Static answer (crawlable summary)
Typical device list: Submersible Well Pump (1/2 HP, 240V)×1, Refrigerator (top-freezer, ~16 cu ft)×1, Router + Modem×1, LED Bulb (60W equivalent)×4, Microwave Oven×1, Phone / Smartphone Charger×2.
| Continuous load | 2,362 W |
|---|---|
| Startup peak | 8,612 W (driven by 1× Submersible Well Pump (1/2 HP, 240V)) |
| Daily energy use | 2,565 Wh |
| Recommended capacity | 3,210 Wh (25% margin included) |
| Minimum inverter | 2,600 W continuous |
Frequently asked questions
What size generator do i need for a well pump?
For a typical setup (submersible well pump (1/2 hp, 240v), refrigerator (top-freezer, ~16 cu ft), router + modem, led bulb (60w equivalent) and microwave oven), you need at least 2,362W of continuous power. The single biggest moment is startup: when 1× submersible well pump (1/2 hp, 240v) kicks on, the momentary draw peaks at 8,612W. For overnight runtime we recommend at least 3,210Wh of battery capacity (your devices use about 2,565Wh per day, plus a 25% margin).
Which power stations can handle this?
Based on published specs, Anker SOLIX F3800 all cover the 8,612W startup peak and give you 1.5 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). A generator that only meets the running load will trip or stall when the biggest motor starts. Our data sources: U.S. DOE Energy Saver, ENERGY STAR certified product database, and manufacturer spec sheets (Franklin Electric, Goodman, Zoeller).