Will a power station run your sump pump?
Usually yes, but only if you size by starting watts. A typical 1/3 HP sump pump runs at roughly 800 watts but can demand around 2,000 watts for the second it starts. A 1/2 HP pump runs near 1,050 watts and can surge toward 3,000 watts. A station whose continuous output clears the surge, with at least 1,000 usable watt hours behind it, handles a normal rainy night comfortably. A station sized by running watts alone will trip exactly when the pit is fullest.
Why sump pumps trip stations that look big enough
Motors do not start gently. For a fraction of a second, a pump motor pulls several times its running power to get the impeller moving. That spike is called starting watts, surge watts, or locked rotor draw, and it is the number that decides whether your backup works. The battery size (watt hours) decides how long it works. Confusing those two numbers is the most expensive mistake in this category, and manufacturers make it easy by printing the battery size in huge type and the surge handling in a spec table footnote.
| Pump size | Typical running watts | Typical starting surge | Planning rule |
|---|---|---|---|
| 1/3 HP | about 800 W | about 1,300 to 2,000 W | Station output of 2,000W or more |
| 1/2 HP | about 1,050 W | about 2,000 to 3,000 W | Station output of 3,000W or more |
| 3/4 HP and up | about 1,400 W+ | 3,000 W+ | Verify against the pump plate, or choose a dedicated backup |
These are planning ranges for common residential pumps, not a substitute for your pump's nameplate. If the plate lists amps, multiply amps by 120 for running watts, then multiply by roughly two and a half for the start. When the plate and the range disagree, believe the plate.
How long will it actually run the pump
Pumps cycle. In a steady rain a healthy pit might run the pump for a minute or two every ten minutes, which is a duty cycle around 10 to 20 percent. Take a 1/3 HP pump at 800 running watts and a 15 percent duty cycle: its average draw is about 120 watts. A station with 2,350 usable watt hours (a BLUETTI Apex 300, for example) runs that pump for roughly 19 hours. The same math on a 3,482 usable watt hour EcoFlow DELTA Pro 3 gives about 29 hours. In a violent storm with a 40 percent duty cycle, cut those numbers by more than half. The runtime calculator has both pump sizes built in as presets with editable duty cycles, so you can test your own storm assumptions.
Two honest warnings. First, a station that is also running your fridge and lights splits its battery three ways. Second, if the power is out, the rain that fills your pit is often still falling. Sump protection is where solar recharge earns its keep on day two.
When a dedicated backup is the better answer
A power station is one way to protect a basement. Dedicated battery backup sump systems and water powered backups solve the same problem differently, and for a house whose only outage fear is a flooded basement, they can be cheaper and automatic. We compare all three approaches in sump pump backup options, compared. The short version: a power station wins when the sump is one of several loads you care about. A dedicated backup wins when the sump is the whole list.
Who should skip this
Skip the power station route if your pump is 3/4 HP or larger and you cannot confirm its starting draw, if your pit runs near continuously in storms (no battery in this class keeps up for days), or if nobody is home to plug anything in when the power fails. Those homes need an automatic system, not a box in the garage.
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