How long will the EcoFlow River 2 Max run a cpap machine?

Q: Will the EcoFlow River 2 Max run a cpap machine?

Yes — the River 2 Max runs a cpap machine comfortably. Its 500W continuous output easily covers the 40W draw, with 1000W of surge on tap for startup.

Q: How long will the EcoFlow River 2 Max run a cpap machine?

The EcoFlow River 2 Max has 512 Wh (about 392 Wh usable at the outlet, estimated). Running a cpap machine that draws 40W, it lasts about 10 hours on a single full charge.

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Will the EcoFlow River 2 Max run a cpap machine?

Yes — the River 2 Max runs a cpap machine comfortably

Its 500W continuous output easily covers the 40W draw, with 1000W of surge on tap for startup.

Estimated runtime

about 10 hours

on a single full charge

Est. usable (AC): 392 Wh

Appliance draw: 40 W

Continuous output: 500 W

How we calculated this

We start from the EcoFlow River 2 Max's 392 Wh of estimated usable energy at the outlet — its 512 Wh rating, derated for a safe depth of discharge and ~15% inverter loss — then divide by the cpap machine's 40W draw:

392 Wh ÷ 40 W ≈ 9.8 hours

Heads up: a cpap machine is a motor/compressor load that spikes 2–3× on startup. The EcoFlow River 2 Max's 500W continuous / 1000W surge output has plenty of headroom for that spike.

Real-world runtime varies with temperature, cable losses, and how hard the appliance actually cycles. Treat this as a solid estimate, not a guarantee.

Check River 2 Max price → Full River 2 Max specs →