How many watts does a well pump use, and how long will a battery run it?
Well pumps draw about 700–2,000 W while running and up to 6,000 W for a moment as the motor starts.
It cycles on and off, so a typical one uses about 1,600 watt-hours a day, about 65 W on average over the day, because it runs only a few minutes at a time. None of the 12 1 kWh stations we track can run it: it needs 240 volts.
None of the 14 2 kWh stations we track can run it: it needs 240 volts.
That is the middle of our range for this appliance. Yours may use less or a lot more: the range, the assumptions and every unit we track are below. Hours are hours of use on one full charge, counting the power each station uses just to stay on.
Buying for this: What size generator for 200 amp service: the load math and the code.
Hours of use by battery size (240 V stations only)
| Battery (listed size) | Typical | Hard-working unit | Efficient unit |
|---|---|---|---|
| 3,000 Wh | about 27 h | 7.9 h | 56 h |
| 5,000 Wh | about 36 h | 12 h | 63 h |
Hours count the power a typical untested station of each size uses just to stay on. Typical uses about 65 W; hard-working 2,000 W on 15% of the time; efficient 700 W on 2% of the time. The station must also start it: see which units can, below.
How much battery a typical one needs
| Outage | Battery needed, typical |
|---|---|
| 12 hours | about 1,200 Wh |
| 24 hours | about 2,400 Wh |
| 3 days | about 7,200 Wh |
Listed watt-hours, counting the inverter loss and the power the station uses to stay on. Past a day, most plans add solar or a generator rather than a bigger battery.
The range behind that
A well pump uses about 700–2,000 watts while running , and needs up to 6,000 watts for a split second when it starts. Over 24 hours it uses roughly 336–7,200 watt-hours.
Buy for the higher number in each range. 21 of the 82 products we track can run it. For example, the EcoFlow DELTA Pro 3 would run it for 11–64 hours of use, from a hard-working unit to an efficient one.
This one is not plug-and-play. It is wired into your house, so you need a licensed electrician.
Sized in a full plan
This load is part of a plan we ran against every unit we track, with picks: The best generator for a well pump.
The numbers behind that
A well pump only runs while refilling the pressure tank, so total energy is modest, but the starting surge is the largest in a typical home.
What it draws while it is actually on.
The momentary surge when a motor or compressor kicks in. Undersized systems fail here, not on running watts.
How much of the hour it is actually drawing power. This is what turns running watts into energy.
A battery gives back less than its label: about 10% is lost turning it into wall power, and the station uses some just to stay on.
Wired into the building
This is connected to your house wiring, not an outlet. Powering it from a portable source needs a transfer switch or an inlet installed by a licensed electrician. Never run a cord from a generator into an outlet to feed a circuit: backfeeding can kill line workers and start fires.
Safety
Well pumps are hardwired and frequently 240V. This is professional-installation territory, and a 120V-only power station is not a candidate regardless of its watt-hour rating.
Check this yourself
Read the pump listed for horsepower and voltage. Many residential well pumps are 240V, which most portable power stations cannot supply at all.
What can run it
Hours of use on one full charge: typical, then the range from a hard-working unit to an efficient one. “Starts it” means the peak output covers even a hard-starting one; “may not start a hard-starting one” means it covers the lower end of the starting range only.
| Product | Continuous | Peak | Starts it? | Hours of use |
|---|---|---|---|---|
| Zendure SuperBase V6400 | 3,800W | 5,000W | may not start a hard-starting one | about 41h 15–66h |
| Jackery Explorer 5000 Plus | 7,200W | 14,400W | starts it | about 31h 12–48h |
| Zendure SuperBase V4600 | 3,800W | 5,000W | may not start a hard-starting one | about 35h 11–62h |
| EcoFlow DELTA Pro 3 | 4,000W | 8,000W | starts it | about 34h 11–64h |
| Anker SOLIX F3800 | 6,000W | 9,000W | starts it | about 26h 9.3–43h |
| Champion 201513 6500W Inverter | 5,000W | 6,500W | starts it | fuel-dependent |
| Champion 201598 8500W Wireless Start Tri Fuel Inverter | 6,500W | 8,500W | starts it | fuel-dependent |
| Champion 201169 6500W Tri Fuel | 6,500W | 8,125W | starts it | fuel-dependent |
What will not work, and why
59 of 82 products cannot run this.
- OUKITEL P5000 Pro — Your plan needs 240V output. This unit supplies 120V.
- Goal Zero Yeti PRO 4000 — Your plan needs 240V output. This unit supplies 120V.
- EcoFlow DELTA Pro — Your plan needs 240V output. This unit supplies 120V.
- Jackery HomePower 3600 Plus — Your plan needs 240V output. This unit supplies 120V.
- Anker SOLIX F3000 (UL9540 Certificated) — Your plan needs 240V output. This unit supplies 120V.
- EcoFlow DELTA 3 Ultra (3072Wh) — Your plan needs 240V output. This unit supplies 120V.