How long will an Anker SOLIX F3800 run a CPAP?

How long will an Anker SOLIX F3800 power a CPAP device?

About 3 days, 9.6 hours (81.6 h total) — roughly 10.2 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 3,840 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, 9.6 hours (81.6 h total) ≈ 10.2 nights

At 40 W via AC (0.85 efficiency) from 3,840 Wh. Via a DC converter cable (0.92 factor) the same device runs about 3 days, 16.3 hours (88.3 h total). The device's 40 W draw is far inside this model's 6,000 W continuous rating.

Runtime by device draw (AC, base battery)

Device draw	Runtime	Nights (8 h)
30 W — travel CPAP, no humidifier	4 days, 12.8 hours (108.8 h total)	13.6
40 W — typical CPAP, no heated humidifier	3 days, 9.6 hours (81.6 h total)	10.2
60 W — CPAP with humidifier, heat off/low	2 days, 6.4 hours (54.4 h total)	6.8
90 W — CPAP with heated humidifier and heated tube	36.3 hours	4.5

Anker SOLIX F3800 specifications (manufacturer)

Capacity	3,840 Wh
Maximum capacity with expansion	26,880 Wh
AC output (continuous)	6,000 W
AC output (surge)	9,000 W
Weight	132.3 lbs

Source: manufacturer product page · 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: Anker SOLIX F3800 model page · Anker SOLIX F3800 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.