How long will an EcoFlow DELTA Pro run a CPAP?

How long will an EcoFlow DELTA Pro power a CPAP device?

About 3 days, 4.5 hours (76.5 h total) — roughly 9.6 nights at 8 hours a night — calculated, not tested. It depends almost entirely on the device's wattage: at the typical 40 W draw (a CPAP without a heated humidifier) the math is 3,600 Wh × 0.85 ÷ 40 W. Heated humidifiers and heated tubes multiply the draw and divide the hours — the table below shows all four preset draws from our CPAP runtime calculator. This page is device-runtime math only: watts in, hours out. It makes no health claims and gives no medical advice.

3 days, 4.5 hours (76.5 h total) ≈ 9.6 nights

At 40 W via AC (0.85 efficiency) from 3,600 Wh. Via a DC converter cable (0.92 factor) the same device runs about 3 days, 10.8 hours (82.8 h total). The device's 40 W draw is far inside this model's 3,600 W continuous rating.

Runtime by device draw (AC, base battery)

Device draw	Runtime	Nights (8 h)
30 W — travel CPAP, no humidifier	4 days, 6.0 hours (102.0 h total)	12.8
40 W — typical CPAP, no heated humidifier	3 days, 4.5 hours (76.5 h total)	9.6
60 W — CPAP with humidifier, heat off/low	2 days, 3.0 hours (51.0 h total)	6.4
90 W — CPAP with heated humidifier and heated tube	34.0 hours	4.2

EcoFlow DELTA Pro specifications (manufacturer)

Capacity	3,600 Wh
Maximum capacity with expansion	10,800 Wh
AC output (continuous)	3,600 W
AC output (surge)	7,200 W
Weight	99 lbs

Source: manufacturer spec sheet via an authorized dealer · pulled 2026-10-19. Data as of Oct 19, 2026. If a figure is not published in that source, we show a dash rather than estimate it.

How this is calculated: hours = capacity × 0.85 (AC) or × 0.92 (DC) ÷ device watts. The AC factor is Bluetti's published runtime factor (REPORTED); the DC factor and the preset wattages are WattLong assumptions (INFERRED) — the watts printed on your device's power brick are the truth, and the CPAP calculator accepts them directly. Model specs are manufacturer figures. Full methodology: how we calculate.

Scope: this page estimates how long a battery runs a device. It does not say any product is suitable for medical use, does not replace the device manufacturer's guidance, and is not medical advice. If your therapy depends on power, build your backup plan with your clinician and test your exact setup at home before you need it.

More on this model: EcoFlow DELTA Pro model page · EcoFlow DELTA Pro refrigerator runtime.

WattLong is reader-supported. Some links on this site are affiliate links: if you buy through them, we may earn a commission at no extra cost to you. See our affiliate disclosure. All results are estimates — verify with the manufacturer and a licensed electrician before relying on them.