Well pump 1 HP: how much battery you need
Well pump 1 HP draws about 1500 W (1000–2000 W range), runs 100% of the time and uses 1500 Wh per day. Start-up surge: 4000 W.
Most 1 HP well pumps in the US run on 240 V; a 120 V power station cannot feed them without a 240 V output. Champion lists 1000–2000 W running; we use the middle for energy and the top starting figure (4000 W) for the peak.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 500 | 758 | 1651 / 4000 |
| For 24 hours | 1500 | 2273 | 1651 / 4000 |
| For 72 hours | 4500 | 6819 | 1651 / 4000 |
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Stations that fit (24 h)
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FAQ
How many watts does a Well pump 1 HP use?
Typically 1500 W while running, with a range of 1000–2000 W depending on model and age. Start-up surge can reach 4000 W.
How long will a 1000 Wh power station run a Well pump 1 HP?
About 0.4 hours on the clock, allowing for the 100% duty cycle, inverter losses and a 20% reserve.
What size power station do I need for a Well pump 1 HP overnight (8 h)?
About 758 Wh of battery and an inverter rated at least 1651 W continuous with 4000 W surge.
Can I run a Well pump 1 HP on solar during an outage?
You need roughly 1000 W of panels in winter to replace a day's use (1500 Wh), charging through a station with a big enough MPPT input.
Other sizes
Other appliances
1 Approximate values: estimated from motor or heater power and typical figures published online, not from a manufacturer chart. Check your appliance label.
Inverter efficiency 88%, usable depth of discharge 90%, reserve 20%. Full method: How we calculate. source