How many watts does a CPAP machine use?
Every number here comes from a named source. Generator charts give a generous figure for sizing a generator or power station. Test data and manufacturer specs show what the appliance draws.
- Running
- 56 to 80 W
- Voltage
- 120 V
How long it runs on a battery
| Battery | Runtime |
|---|---|
| 1 kWh | 15 h |
| 2 kWh | 30 h |
| 3 kWh | 46 h |
| 5 kWh | 3 days |
Running nonstop at 56 W, with 85% of the battery usable after inverter losses.
What each source says
| Figure | Value | Source and basis |
|---|---|---|
| Running | 56 (up to 73) W | ResMed AirSense 11 power supply specificationResMed AirSense 11: 56.1 W typical, 73.2 W peak power consumption. |
| Running | 80 W | Philips, DreamStation 80 W power supply instructionsPhilips DreamStation power supply rating (80 W), sized for the machine with humidifier and heated tube. Real draw is lower. |
Good to know
- Running a CPAP from its DC adapter skips the inverter loss of a power station's AC outlet.