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

About 44 hours from a full charge. A sump pump averages about 80 W (800 W running, on about 10% of the time), and the 4,096 Wh battery gives about 3,482 Wh after inverter losses. That is 2.3% of the battery an hour.

Will the EcoFlow DELTA Pro 3 start a sump pump?

Yes. It needs about 2,100 W for a moment when the pump starts, and the EcoFlow DELTA Pro 3 is rated for 8,000 W surge, 3.8 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), 55% of the 3,482 Wh the EcoFlow DELTA Pro 3 can deliver.

EcoFlow · Will it run?

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

Published October 11, 2026

Short answerYes

Yes. The EcoFlow DELTA Pro 3 runs a sump pump for about 44 hours from a full charge. It needs about 2,100 W for a moment when the pump starts, well within the 8,000 W surge rating, then about 800 W while running against 4,000 W continuous.

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Key numbers

Runtime: 44 hrs; from a full charge
Battery used per hour: 2.3%; 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 Pro 3

Battery: 4,096 Wh; about 3,482 Wh usable
Output: 4,000 W; continuous
Surge: 8,000 W; start-up peak

How we worked it out: 4,096 Wh × 0.85 ÷ 80 W average (800 W × 0.1 duty) = about 44 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 Pro 3

4,096 Wh · 4,000 W output · 8,000 W surge · 113.5 lb

Full specs and runtimes

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What else the EcoFlow DELTA Pro 3 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 44 hours above is an estimate, not a measured result.

Common questions

How long will the EcoFlow DELTA Pro 3 run a sump pump?: About 44 hours from a full charge. A sump pump averages about 80 W (800 W running, on about 10% of the time), and the 4,096 Wh battery gives about 3,482 Wh after inverter losses. That is 2.3% of the battery an hour.
Will the EcoFlow DELTA Pro 3 start a sump pump?: Yes. It needs about 2,100 W for a moment when the pump starts, and the EcoFlow DELTA Pro 3 is rated for 8,000 W surge, 3.8 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), 55% of the 3,482 Wh the EcoFlow DELTA Pro 3 can deliver.