Sewage ejector pump 1/2 HP: how much battery you need1
Sewage ejector pump 1/2 HP draws about 1000 W (1000 W range), runs 100% of the time and uses 1000 Wh per day. Start-up surge: 2200 W.
Estimate: the same motor class as a 1/2 HP sump pump. A basement bathroom cannot be used when it stops.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 333 | 506 | 1100 / 2200 |
| For 24 hours | 1000 | 1516 | 1100 / 2200 |
| For 72 hours | 3000 | 4546 | 1100 / 2200 |
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Stations that fit (24 h)
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FAQ
How many watts does a Sewage ejector pump 1/2 HP use?
Typically 1000 W while running, with a range of 1000 W depending on model and age. Start-up surge can reach 2200 W.
How long will a 1000 Wh power station run a Sewage ejector pump 1/2 HP?
About 0.7 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 Sewage ejector pump 1/2 HP overnight (8 h)?
About 506 Wh of battery and an inverter rated at least 1100 W continuous with 2200 W surge.
Can I run a Sewage ejector pump 1/2 HP on solar during an outage?
You need roughly 667 W of panels in winter to replace a day's use (1000 Wh), charging through a station with a big enough MPPT input.
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.