Well pump 3/4 HP: how much battery you need1
Well pump 3/4 HP draws about 1200 W (1200 W range), runs 100% of the time and uses 1200 Wh per day. Start-up surge: 3000 W.
Estimate between the 1/2 HP and 1 HP charts: about 1,000–1,500 W running and 2,500–4,500 W to start. The nameplate amps × volts is the final word.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 400 | 607 | 1320 / 3000 |
| For 24 hours | 1200 | 1819 | 1320 / 3000 |
| For 72 hours | 3600 | 5455 | 1320 / 3000 |
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Stations that fit (24 h)
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FAQ
How many watts does a Well pump 3/4 HP use?
Typically 1200 W while running, with a range of 1200 W depending on model and age. Start-up surge can reach 3000 W.
How long will a 1000 Wh power station run a Well pump 3/4 HP?
About 0.6 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 3/4 HP overnight (8 h)?
About 607 Wh of battery and an inverter rated at least 1320 W continuous with 3000 W surge.
Can I run a Well pump 3/4 HP on solar during an outage?
You need roughly 800 W of panels in winter to replace a day's use (1200 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.