Well pump 1.5 HP: how much battery you need1
Well pump 1.5 HP draws about 2100 W (2100 W range), runs 100% of the time and uses 2100 Wh per day. Start-up surge: 5500 W.
Estimate scaled from the 1 HP figures; pumps this size run on 240 V.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 700 | 1061 | 2310 / 5500 |
| For 24 hours | 2100 | 3182 | 2310 / 5500 |
| For 72 hours | 6300 | 9546 | 2310 / 5500 |
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Stations that fit (24 h)
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FAQ
How many watts does a Well pump 1.5 HP use?
Typically 2100 W while running, with a range of 2100 W depending on model and age. Start-up surge can reach 5500 W.
How long will a 1000 Wh power station run a Well pump 1.5 HP?
About 0.3 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 1.5 HP overnight (8 h)?
About 1061 Wh of battery and an inverter rated at least 2310 W continuous with 5500 W surge.
Can I run a Well pump 1.5 HP on solar during an outage?
You need roughly 1400 W of panels in winter to replace a day's use (2100 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.