How long will a power station run my CPAP?
How many nights does one charge last?
The nights you get depend on the CPAP's watts, the station's watt-hour capacity, and whether the path is the AC inverter or the DC supply.
This page uses the BLUETTI Elite 100 V2 at 1,024 watt-hours and 1,800 watts continuous, as of October 5, 2026.
Nights on this page are about 8 hours of sleep.
Published specs
| Item | Spec | Value |
|---|---|---|
| ResMed AirSense 11, published typical | Load | Typical power consumption 56.1 W (111.5 VA), as of October 5, 2026 |
| DreamStation with heated humidifier | Load | DC power consumption 12 VDC, 6.67 A, when the heated humidifier is used with a therapy device, as of October 5, 2026 |
| ResMed AirSense 11, 65 W supply DC rating | Load | 65 W power supply unit. DC output 24 V, 2.71 A, as of October 5, 2026 |
| BLUETTI Elite 100 V2 | Capacity | 1,024 watt-hours, as of October 5, 2026 |
| BLUETTI Elite 100 V2 | Output | 1,800 watts, as of October 5, 2026 |
| BLUETTI Elite 100 V2 | Chemistry | LiFePO4, as of October 19, 2026 |
| BLUETTI Elite 100 V2 | Weight | 25 lb, as of October 19, 2026 |
A BLUETTI Elite 100 V2 at 1,024 watt-hours and 85% inverter efficiency runs this ResMed AirSense 11, published typical, for about 15.5 hours, about two good nights' sleep. As of October 5, 2026.
The ResMed AirSense 11 user guide lists typical power consumption of 56.1 watts. As of October 5, 2026.
Check the device manual, and ask your doctor, before you count on backup power for this device. This page is a power estimate, not medical advice.
Estimated runtime
Overnight
15.5 hours, about two good nights' sleep
1,024 watt-hours at 85% inverter efficiency is 870.4 watt-hours delivered. This load averages 56.1 watts. 870.4 divided by 56.1 is about 15.5 hours.
Assumption: inverter efficiency is 85%.
ResMed publishes a typical power figure of 56.1 watts. The user guide does not say whether the humidifier is on.
Worked example
ResMed AirSense 11, published typical on the BLUETTI Elite 100 V2 (1,024 watt-hours) at 85% inverter efficiency. Specs in this example are as of October 5, 2026.
| Step | Figure |
|---|---|
| Running watts | 56.1 watts |
| Duty cycle | 100 percent of the time |
| Average watts | 56.1 x 1.00 = 56.1 watts |
| Nameplate volts | 120 volts |
| Delivered watt-hours | 1,024 x 0.85 = 870.4 |
| Hours | 870.4 / 56.1 = about 15.5 |
| Nights | 15.5 / 8 = 1.9394 nights before rounding to the nearest half, about two good nights' sleep |
Result: 15.5 hours, about two good nights' sleep.
Assumptions
| Assumption | Value | Note |
|---|---|---|
| Inverter efficiency | 85%, as of October 5, 2026 | Used for the AC presets. The DC supply rating skips it. |
| Runtime formula | watt-hours x efficiency / running watts, as of October 5, 2026 | Duty on these presets is 100 percent, because the manuals list continuous operation while the machine is on. |
| Sleep per night | About 8 hours, as of October 5, 2026 | Nights are the hour count divided by 8, rounded to the nearest half night. Under 8 hours, before that rounding, is less than one full night. The word about stays on the night count. |
| AirSense 11 typical | 56.1 watts, as of October 5, 2026 | Published typical power from the user guide. |
| DreamStation humidifier | 80.04 watts, as of October 5, 2026 | 12 volts times 6.67 amps from the heated humidifier manual. |
| Elite 100 V2 | 1,024 watt-hours, 120 volts, as of October 5, 2026 | Continuous AC output is 1,800 watts. A peak above that is not in the spec table used here. |
Questions
How long will a 1,024 watt-hour station run an AirSense 11 at the published typical power?
About 15.5 hours, about two good nights' sleep, at 85 percent inverter efficiency. The user guide lists 56.1 watts typical. 1,024 watt-hours times 0.85 is 870.4 watt-hours, and that divided by 56.1 is about 15.5 hours. Nights use about 8 hours of sleep a night. As of October 5, 2026.
What does the nights line mean?
About 8 hours of sleep a night. The night count is the hour estimate divided by 8, then rounded to the nearest half night. Under 8 hours, before that rounding, reads as less than one full night. As of October 5, 2026.
What is the DC adapter case?
The AirSense 11 guide lists a 65 watt power supply with a DC output of 24 volts at 2.71 amps, which is 65.04 watts. That preset uses the rated output and skips inverter loss. It is not a measured therapy draw. The AC product is not shown for that DC-side rating. As of October 5, 2026.
Is this medical advice?
Check the device manual, and ask your doctor, before you count on backup power for this device. This page is a power estimate, not medical advice. As of October 5, 2026.
Sources
Updated .
- ResMed AirSense 11The ResMed AirSense 11 user guide lists typical power consumption of 56.1 watts. As of October 5, 2026.
- Philips DreamStation Heated HumidifierThe Philips DreamStation heated humidifier manual lists DC power consumption of 12 volts at 6.67 amps when the humidifier is used with a therapy device. That is 80.04 watts. As of October 5, 2026.
- ResMed AirSense 11 65 W power supplyThe same AirSense 11 user guide lists a 65 watt power supply with a DC output of 24 volts at 2.71 amps. That rated output is 65.04 watts. It is the adapter rating, not a measured therapy wattage. As of October 5, 2026.
- BLUETTI Elite 100 V2BLUETTI lists the Elite 100 V2 at 1,024 watt-hours, with 1,800 watts of AC output at 120 volts. Manual: https://s4.bluettipower.com/bluetti/purchasePageBiz/2026/05/Elite%C2%A0100%C2%A0V2%C2%A0User%20Manual%20US%20EN-FR-1778731949298-2371.pdf As of October 5, 2026.