The short answer
A typical cpap with heated humidifier needs about 70 W running, averaging about 70 W over time. A full day needs roughly 1,976 Wh of battery.
The load and who can run it
| Item | Typical value | Basis |
|---|---|---|
| Running watts | 70 W | typical planning value |
| Starting watts | No significant surge | typical planning value |
| Duty cycle | 100% | share of time drawing power |
| Average draw | 70 W | running watts × duty cycle |
Medical equipment: use the device label and ask the prescriber or maker about backup power.
SafetyThis is medical equipment. Wattstanding cannot say whether any product is suitable as backup for a medical device. Use the device label, ask the device maker and your prescriber about backup power, and plan for outages with your care team.
Power stations that can run it (82)
Wattstanding calculationWattstanding calculation — runtime = capacity × 85% ÷ (running watts × duty cycle). Showing the 30 lowest-priced of 82 qualifying stations.
Generators that can run it (157)
Total your own list with the appliance load & runtime calculator.
Questions readers ask
How many watts does a cpap with heated humidifier use?
A typical one runs on about 70 W; averaged over time it draws about 70 W. Check your own nameplate.
How many watt-hours do I need to run it for a day?
About 1,976 Wh of battery capacity for 24 hours, by our calculation (average draw × 24 h ÷ 85% efficiency).
Figures marked as Wattstanding calculations show their working; product figures come from the sources on each product page. How we work