How long will the EcoFlow DELTA 3 Plus run a sump pump?

About 11 hours from a full charge. A sump pump averages about 80 W (800 W running, on about 10% of the time), and the 1,024 Wh battery gives about 870 Wh after inverter losses. That is 9.2% of the battery an hour.

Will the EcoFlow DELTA 3 Plus start a sump pump?

Yes. It needs about 2,100 W for a moment when the pump starts, and the EcoFlow DELTA 3 Plus is rated for 3,600 W surge, 1.7 times that. Avoid starting other motors at the same moment.

How much of the battery does a sump pump use in a day?

About 1,920 Wh a day (80 W × 24 hours), more than the 870 Wh the EcoFlow DELTA 3 Plus can deliver, so plan to recharge every 11 hours.

EcoFlow · Will it run?

Can the EcoFlow DELTA 3 Plus run a sump pump (1/3 HP)?

Published October 11, 2026

Short answerYes

Yes. The EcoFlow DELTA 3 Plus runs a sump pump for about 11 hours from a full charge. It needs about 2,100 W for a moment when the pump starts, within the 3,600 W surge rating, then about 800 W while running against 1,800 W continuous.

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Key numbers

Runtime: 11 hrs; from a full charge
Battery used per hour: 9.2%; at 80 W average

Sump pump (1/3 HP)

Running: 800 W; 700–1115 W range
Start-up: 2,100 W
Average: 80 W; on 10% of the time

EcoFlow DELTA 3 Plus

Battery: 1,024 Wh; about 870 Wh usable
Output: 1,800 W; continuous
Surge: 3,600 W; start-up peak

How we worked it out: 1,024 Wh × 0.85 ÷ 80 W average (800 W × 0.1 duty) = about 11 hours. The 0.85 covers inverter and battery losses. We do not test units ourselves; the numbers come from the official spec sheets and typical device draws. How we pick

EcoFlow DELTA 3 Plus

1,024 Wh · 1,800 W output · 3,600 W surge · 27.6 lb

Full specs and runtimes

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What else the EcoFlow DELTA 3 Plus runs

One device at a time, from a full charge.

Other power stations for a sump pump

The nearest sizes that also run it.

Keep going

Real runtime depends on the model you own, room temperature and battery age. The 11 hours above is an estimate, not a measured result.

Common questions

How long will the EcoFlow DELTA 3 Plus run a sump pump?: About 11 hours from a full charge. A sump pump averages about 80 W (800 W running, on about 10% of the time), and the 1,024 Wh battery gives about 870 Wh after inverter losses. That is 9.2% of the battery an hour.
Will the EcoFlow DELTA 3 Plus start a sump pump?: Yes. It needs about 2,100 W for a moment when the pump starts, and the EcoFlow DELTA 3 Plus is rated for 3,600 W surge, 1.7 times that. Avoid starting other motors at the same moment.
How much of the battery does a sump pump use in a day?: About 1,920 Wh a day (80 W × 24 hours), more than the 870 Wh the EcoFlow DELTA 3 Plus can deliver, so plan to recharge every 11 hours.