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How long will a power station run a sump pump?

Last reviewed 2026-10-26

Quick answer

A 1/3 HP sump pump draws about 800 W while pumping, but only runs part of the time. At a typical 25% duty (about 200 W average), a 1,000 Wh station lasts around 4 hours. In a storm where it runs half the time, expect closer to 2. The station must also handle a startup surge of up to 2,000 W.

Calculate your runtime

Powering through
Wh

Printed on the station or in its specs, in watt-hours (Wh).

W

Continuous output, not the surge or peak figure.

What will you power?

  • Cycles on and off: runs at about 800 W, averaging 200 W.

Estimated runtime

4 h 21 min

from 100% to empty

Average load

200 W

what drains the battery

Peak load

2,000 W

800 W running + startup surge

Uses 85% of the rated 1,024 Wh to cover inverter and conversion losses. Real runtime varies with temperature, battery age and how often appliances cycle.

Compare this load across popular power stations
Power stationCapacityRuntimeCan it run all at once?
EcoFlow River 3245 Wh—No (300 W max)
EcoFlow River 2256 Wh—No (300 W max)
Jackery Explorer 240 v2256 Wh—No (300 W max)
EcoFlow River 3 Plus286 Wh—No (600 W max)
Jackery Explorer 300 Plus288 Wh—No (300 W max)
Jackery Explorer 600 v2640 Wh—No (500 W max)
EcoFlow River 2 Pro768 Wh3 h 16 minCheck surge rating
Anker SOLIX C800 Plus768 Wh3 h 16 minCheck surge rating
Bluetti AC70768 Wh3 h 16 minCheck surge rating
EcoFlow Delta 21,024 Wh4 h 21 minYes
EcoFlow Delta 31,024 Wh4 h 21 minYes
EcoFlow Delta 3 Plus1,024 Wh4 h 21 minYes
Anker SOLIX C1000 Gen 21,024 Wh4 h 21 minYes
Bluetti Elite 100 V21,024 Wh4 h 21 minYes
Anker SOLIX C10001,056 Wh4 h 29 minYes
Jackery Explorer 1000 v21,070 Wh4 h 33 minYes
Bluetti AC1801,152 Wh4 h 54 minYes
Jackery Explorer 1000 Plus1,264 Wh5 h 22 minYes
Jackery Explorer 1500 v21,536 Wh6 h 32 minYes
Jackery Explorer 2000 v22,042 Wh8 h 41 minYes
Jackery Explorer 2000 Plus2,042 Wh8 h 41 minYes
EcoFlow Delta 2 Max2,048 Wh8 h 42 minYes
EcoFlow Delta 3 Max2,048 Wh8 h 42 minYes
Anker SOLIX F2000 (767)2,048 Wh8 h 42 minYes
Bluetti AC200L2,048 Wh8 h 42 minYes
Bluetti Elite 200 V22,074 Wh8 h 49 minYes
Jackery Explorer 3000 v23,072 Wh13 h 3 minYes
EcoFlow Delta Pro3,600 Wh15 h 18 minYes
Anker SOLIX F38003,840 Wh16 h 19 minYes
EcoFlow Delta Pro 34,096 Wh17 h 24 minYes
Jackery Explorer 5000 Plus5,040 Wh21 h 25 minYes

Manufacturer specs. Confirm current figures on the brand's site before buying.

Runtime by power station size: Sump pump, 1/3 HP

Sump pump, 1/3 HP: about 200 W average (80–400 W range), AC outlets at 85% efficiency, from full to empty.
Power station sizeTypical runtimeRealistic range
300 Wh1 h 16 min0.6–3.2 h
500 Wh2 h 8 min1.1–5.3 h
1,000 Wh4 h 15 min2.1–10.6 h
1,500 Wh6 h 23 min3.2–15.9 h
2,000 Wh8 h 30 min4.3–21.3 h
3,000 Wh12 h 45 min6.4–31.9 h

Runtime by power station size: Sump pump, 1/2 HP

Sump pump, 1/2 HP: about 260 W average (100–520 W range), AC outlets at 85% efficiency, from full to empty.
Power station sizeTypical runtimeRealistic range
300 Wh59 min0.5–2.5 h
500 Wh1 h 38 min0.8–4.3 h
1,000 Wh3 h 16 min1.6–8.5 h
1,500 Wh4 h 54 min2.5–12.8 h
2,000 Wh6 h 32 min3.3–17.0 h
3,000 Wh9 h 48 min4.9–25.5 h

Runtime depends on the weather, not just the pump

A sump pump switches on when water reaches the float, pumps for 10–60 seconds, and switches off. How often that happens depends on rainfall, the water table and the pit size, from a few times an hour to almost constantly. The same pump on the same station might last 10 hours in light rain and 2 hours in a downpour.

Measure your pump's duty cycle

  1. During a storm, time how long the pump runs each cycle (for example, 20 seconds).
  2. Time how long it waits between cycles (for example, 60 seconds).
  3. Duty cycle = run time ÷ (run time + wait). Here: 20 ÷ 80 = 25%.
  4. Average watts = running watts × duty cycle. An 800 W pump at 25% averages 200 W. Enter that in the calculator above.

Can the station start it?

Pump motors have a hard startup: 2–3× their running watts. A 1/3 HP pump can need around 2,000 W for a split second, and a 1/2 HP pump about 2,500 W. Choose a station rated at least 1,500–2,000 W continuous with a higher surge rating, and test it on a dry day by pouring a bucket of water into the pit.

The station must start the pump every single cycle, often unattended overnight. Check your manual: some stations need their AC output switched on manually after they recover from a shutdown.

Battery backup sump pumps

A dedicated battery backup sump pump (a second 12 V DC pump in the same pit) is designed for exactly this job and switches on automatically. Many homeowners use one of those as the main outage protection and keep a power station as an extra layer. If your basement floods often, talk to a plumber about the right setup.

Check the motor's amps and HP on the label, and use the inverter size calculator to check the surge for a DIY system.

Frequently asked questions

Will a 1,000 W power station run a sump pump?
Probably not reliably. Even a 1/3 HP pump can surge to around 2,000 W at startup. Look for a station rated 1,800 W or more continuous, and test it with your pump before an emergency.
How many watts does a sump pump use?
Roughly 600–1,000 W running for a 1/3 HP pump and 900–1,200 W for a 1/2 HP pump, with startup surges of 2–3× that. The exact figure is on the motor label (watts, or amps × 120 V).
How long can a sump pump go without power?
That depends entirely on how fast water enters the pit. In heavy rain it can overflow in under an hour, which is why backup power matters most during storms.

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