CPAP battery planning
Estimate how long a portable power station can run a CPAP device, or calculate the battery size needed for one or more nights.
This page is for electrical runtime planning only. It does not provide medical advice and should not be used to change therapy settings, disable medically necessary features, or replace guidance from your CPAP manufacturer or healthcare provider.
Average load: 53 W
Official typical device consumption. The 90 W supply rating is not treated as the average load.
Use only manufacturer-approved DC accessories. A generic DC cable can damage equipment or create unsafe operation.
These estimates use the same calculation functions as the calculator above with a 1000Wh battery, 100% charge, 95% battery health, 10% reserve, and 88% efficiency. Runtime nights use 8 hours per night.
| Official profile | Average load used | 1000Wh runtime | Estimated nights |
|---|---|---|---|
| ResMed AirMiniOfficial typical and peak device consumption. | 6.3 W | 4 days 23 hr 26 min | 14.9 nights |
| ResMed AirSense 10 AutoSet / EliteOfficial typical device consumption. The 90 W supply rating is not treated as the average load. | 53 W | 14 hr 12 min | 1.8 nights |
| ResMed AirSense 11 AutoSet / EliteOfficial typical device consumption. The 65 W supply rating is not treated as the average load. | 56.1 W | 13 hr 25 min | 1.7 nights |
| ResMed AirSense 10 battery-guide example, humidifier 4Official battery-guide example using 2.30 A at 12 V DC with SlimLine tubing and humidifier set to 4 at the guide's 10 cm H2O row. | 27.6 W | 1 day 3 hr 16 min | 3.4 nights |
| ResMed AirSense 10 battery-guide example, ClimateLine autoOfficial battery-guide example using 3.77 A at 12 V DC with ClimateLine Air tubing and humidifier auto at the guide's 10 cm H2O row. | 45.2 W | 16 hr 39 min | 2.1 nights |
| ResMed AirSense 10 battery-guide example, ClimateLine 30C + humidifier 8Official battery-guide example using 4.92 A at 12 V DC with ClimateLine Air tubing at 30C and humidifier set to 8 at the guide's 10 cm H2O row. | 59 W | 12 hr 45 min | 1.6 nights |
Use a custom watt value when your exact model is not listed. The best inputs are manufacturer documentation or a measured average from a plug-in power meter.
| Generic average load | 1000Wh runtime | Estimated nights |
|---|---|---|
| 20 W generic example | 1 day 13 hr 37 min | 4.7 nights |
| 30 W generic example | 1 day 1 hr 5 min | 3.1 nights |
| 40 W generic example | 18 hr 49 min | 2.4 nights |
| 50 W generic example | 15 hr 3 min | 1.9 nights |
| 60 W generic example | 12 hr 32 min | 1.6 nights |
A CPAP power brick may be rated for more watts than the device normally uses. This calculator uses typical consumption or documented battery-guide examples where available, not the adapter rating as average load.
Humidifiers and heated tubes can materially increase energy use. This page lists those differences only when an official source provides a documented example, and otherwise lets you enter a measured custom average.
If your model is not listed, choose Custom average watts. Use the manufacturer documentation or measure your usual setup with a power meter. Do not change prescribed therapy settings just to lower wattage.
AC use normally includes inverter losses. DC operation may be more efficient only when you use accessories approved for your exact CPAP and power station.
Results are estimates for electrical planning only. Actual runtime can vary with device configuration, humidification, heated tubing, mask leaks, altitude, temperature, battery condition, inverter losses, and other connected loads.
Do not disable medically necessary features or change prescribed settings to extend battery runtime. Follow your CPAP manufacturer instructions and healthcare provider guidance.