Humidifier
The biggest draw. Turning it off can greatly extend your runtime.
Estimate your runtime
A planning number, not a promise. Change the settings to match your nights.
Pick your machine to see its adapter voltage.
8.4W
Without the humidifier and heated tube. ResMed measured these at 12V through its DC converter. Your machine may differ; a watt meter shows your own number.
Humidifier watts
W
Heated tube watts
W
8h
Estimates, not guarantees. Pressure, mask leak and room temperature change the number.
What changes the number.
Heated tube
Also power-hungry. Off helps a lot.
Pressure
Higher pressure means more power.
Mask leak
A leaky seal makes the motor work harder.
Getting more nights.
Turn off the humidifier and heated tube when you're on battery.
Use the DC cable, not an inverter. Direct DC wastes less power.
Recharge during the day from the car or a solar panel.
How we estimate
We start from the battery's capacity and count 82% of it as usable, after conversion losses. We then keep another 15% in reserve as a planning margin. What's left is divided by your machine's average power draw, plus the humidifier and heated tube when they're on, and then by the hours you sleep.
The starting point is 8.4W: ResMed's published draw for an AirSense 10 at 6 cmH2O with the humidifier off. It's the same number behind the nights on every product page. Pick your pressure above to see how it changes.
The result is a planning number for a typical night. It isn't a guarantee.
Know your machine? Get the full match.
See the cable, the voltage and the battery that fits.