How Many Watts Does a Well Pump Use?
Verified July 2026 Manufacturer + DOE typical ratings. Methodology
Well Pump wattage by type
| Pump size | Running watts | Starting surge |
|---|---|---|
| 1/3 HP | 750W | 2,200W |
| 1/2 HP | 1,000W | 3,000W |
| 3/4 HP | 1,500W | 4,000W |
| 1 HP | 2,000W | 5,000W |
| 1.5 HP | 2,500W | 6,500W |
The surge number is what kills undersized backup plans. An induction motor draws 3-5x its running wattage for the first seconds while the rotor spins up, and a well pump does this every time the pressure tank drops below its cut-in setting. During an outage with conservative water use, expect roughly a 10% duty cycle - the pump runs about 6 minutes per hour of active household use. Sizing rule: your inverter's surge rating must exceed the pump's start surge with margin, and 240V output is non-negotiable for standard two-wire and three-wire submersible pumps.
How long real power stations run a well pump
Computed from each unit's rated capacity at 85% inverter efficiency and a 10% duty cycle (1000W running, 3,000W start). Units that can't clear the start surge or lack 240V are excluded.
| Power station | Capacity | Estimated runtime | Price | |
|---|---|---|---|---|
| EcoFlow Delta Pro Ultra Longest | 6,144 Wh | 2.2 days | $5,799 | Check price → |
| EcoFlow Delta Pro 3 | 4,096 Wh | 34.8 hours | $3,699 | Check price → |
| Anker SOLIX F3800 Plus | 3,840 Wh | 32.6 hours | $4,799 | Check price → |
⚡ Backing up more than a well pump?
Add your other appliances and outage length — our calculator sizes the whole load and shows exactly which units fit.
Size my full backup →Frequently asked questions
Can a generator or power station run a well pump on 120V?
No - standard residential submersible pumps are 240V. Converting to 120V means replacing the pump. Choose 240V-capable backup instead: EcoFlow Delta Pro 3, Anker F3800 Plus, or Delta Pro Ultra.
How many watt-hours does a well pump use per day in an outage?
At ~10% conservation duty, a 1/2 HP pump uses about 2.4kWh per 24 hours (1,000W x 2.4 run-hours). A 4kWh battery covers a full day of water plus lights.
Do I need an electrician to hook backup power to a well pump?
Yes - a transfer switch or generator inlet ($300-800 installed) connects backup power to the pump circuit safely. Backfeeding an outlet is illegal and dangerous.
Keep reading
- Full comparison database — every spec, side by side
- Best-for guides — ranked picks by use case
- 2026 state incentives — what still pays after the federal credit