How long will the EcoFlow DELTA Pro 3 run a portable oxygen concentrator?

About 4 days from a full charge. A portable oxygen concentrator averages about 40 W, and the 4,096 Wh battery gives about 3,482 Wh after inverter losses. That is 1.1% of the battery an hour.

Is the EcoFlow DELTA Pro 3 enough backup for a portable oxygen concentrator?

Only as a short bridge. It covers about 4 days from a full charge. A power station should never be your only backup for medical equipment: ask your equipment supplier what they provide in an outage, register with your utility’s medical-needs program, and keep the settings your prescriber gave you.

EcoFlow · Will it run?

Can the EcoFlow DELTA Pro 3 run a portable oxygen concentrator?

Published October 15, 2026

Short answerYes

Yes. The EcoFlow DELTA Pro 3 runs a portable oxygen concentrator for about 4 days from a full charge. At about 40 W on average it uses 1.1% of the battery an hour, and the 4,000 W output is far more than it needs.

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Key numbers

Runtime: 4 days; from a full charge
Battery used per hour: 1.1%; at 40 W average

Portable oxygen concentrator

Running: 40 W; 15–120 W range
Start-up: 120 W
Average: 40 W; runs all 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 ÷ 40 W = about 4 days. 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 portable oxygen concentrator

The nearest sizes that also run it.

Keep going

Real runtime depends on the model you own, room temperature and battery age. The 4 days above is an estimate, not a measured result.

Common questions

How long will the EcoFlow DELTA Pro 3 run a portable oxygen concentrator?: About 4 days from a full charge. A portable oxygen concentrator averages about 40 W, and the 4,096 Wh battery gives about 3,482 Wh after inverter losses. That is 1.1% of the battery an hour.
Is the EcoFlow DELTA Pro 3 enough backup for a portable oxygen concentrator?: Only as a short bridge. It covers about 4 days from a full charge. A power station should never be your only backup for medical equipment: ask your equipment supplier what they provide in an outage, register with your utility’s medical-needs program, and keep the settings your prescriber gave you.