CPAP power draw (manufacturer figures)
These figures come from manufacturer documents and help you size a battery or check an inverter. Humidification and heated tubing are by far the biggest power users.
| Device | Configuration | Published figure | Approx. watts | Battery for 8 hours (12 V) |
|---|---|---|---|---|
| ResMed AirSense 11 | Typical, per user guide (24 V, 65 W power supply) | 56.1 W typical | 56 | Not published |
| ResMed AirSense 11 | Peak, per user guide | 73.2 W peak | 73 | Not published |
| ResMed AirMini | Typical, per fact sheet (24 V, 0.83 A output) | 6.3 W typical | 6 | Not published |
| ResMed AirMini | Peak, per fact sheet | 27 W peak (1 W standby) | 27 | Not published |
| ResMed AirSense 10 | 10 cm H2O, SlimLine tubing, no humidifier | 0.93 A at 12 V DC | 11 | 12 Ah |
| ResMed AirSense 10 | 10 cm H2O, SlimLine tubing, humidifier at 4 | 2.30 A at 12 V DC | 28 | 28 Ah |
| ResMed AirSense 10 | 10 cm H2O, SlimLine tubing, humidifier at 8 | 3.66 A at 12 V DC | 44 | 44 Ah |
| ResMed AirSense 10 | 10 cm H2O, ClimateLineAir, humidifier on Auto | 3.77 A at 12 V DC | 45 | 46 Ah |
| ResMed AirSense 10 | 10 cm H2O, ClimateLineAir at 30 C, humidifier at 8 | 4.92 A at 12 V DC | 59 | 60 Ah |
Notes
- Approximate watts are our arithmetic: for 12 V DC rows, 12 V times the published current; for other rows, the published wattage rounded.
- AirSense 10 figures and battery sizes come from ResMed's battery guide (document 198103/4, dated August 2015), which uses the Air10 DC/DC converter; its battery sizes include a 50% safety margin.
- Higher pressure, higher humidity, heated tubing and mask leaks all increase draw. Turning off the humidifier and heated tube is the most effective way to extend battery life.
- We list only figures the manufacturer has published. Other machines are omitted where we could not find a manufacturer figure.
- Check your own model's user guide; figures can differ by region and revision.
Sources
- https://document.resmed.com/documents/products/machine/airsense-11/user-guide/airsense11_user-guide_anz_eng.pdf
- https://www.resmed.com.au/hubfs/Resmed-ANZ-2020/AirMini-Device-Fact-Sheet.pdf
- https://ap.resmed.com/knowledge/how-much-power-does-the-airmini-machine-draw
- https://document.resmed.com/documents/products/serviceandsupport/battery-guide/battery-guide_glo_eng.pdf
More reference tables
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