How long will the EcoFlow DELTA 3 Plus run a box fan?

About 10 hours from a full charge. A box fan averages about 85 W, and the 1,024 Wh battery gives about 870 Wh after inverter losses. That is 9.8% of the battery an hour.

Can I run other things at the same time?

Yes, up to about 1,715 W more of the 1,800 W output. Each thing you add shares the same battery, so the 10 hours for a box fan gets shorter.

How many days of normal use is that?

About 1 day, if you use a box fan about 8 hours a day and nothing else is plugged in.

EcoFlow · Will it run?

Can the EcoFlow DELTA 3 Plus run a box fan (20 in)?

Published October 16, 2026

Short answerYes

Yes. The EcoFlow DELTA 3 Plus runs a box fan for about 10 hours from a full charge. At about 85 W on average it uses 9.8% of the battery an hour, and the 1,800 W output leaves plenty of room for more.

Add your other devices

Key numbers

Runtime: 10 hrs; from a full charge
Battery used per hour: 9.8%; at 85 W average

Box fan (20 in)

Running: 85 W; 56–200 W range
Start-up: 102 W
Average: 85 W; runs all 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 ÷ 85 W = about 10 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 box fan

The nearest sizes that also run it.

Keep going

Real runtime depends on the model you own, room temperature and battery age. The 10 hours above is an estimate, not a measured result.

Common questions

How long will the EcoFlow DELTA 3 Plus run a box fan?: About 10 hours from a full charge. A box fan averages about 85 W, and the 1,024 Wh battery gives about 870 Wh after inverter losses. That is 9.8% of the battery an hour.
Can I run other things at the same time?: Yes, up to about 1,715 W more of the 1,800 W output. Each thing you add shares the same battery, so the 10 hours for a box fan gets shorter.
How many days of normal use is that?: About 1 day, if you use a box fan about 8 hours a day and nothing else is plugged in.