How long will a power station run my CPAP?

This is a device-runtime calculator: watts in, hours out. It makes no health claims and gives no medical advice — for anything about your therapy, talk to your clinician. For an outage plan, test your exact setup at home before you need it.

Your device's power draw

The presets are typical values, INFERRED — your device's label is the truth. Heated humidifiers and heated tubes are the big variable: turning heat off is the single largest runtime lever most users have.

Power station

Include expansion batteries (maximum capacity)

Hours per night

Using a DC converter cable (0.92 factor instead of 0.85 AC)

Keep a 10% reserve

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). Model capacities are manufacturer specs (CONFIRMED/REPORTED per model page). 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 it.

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.