How Many Watts Does a CPAP Machine Use?
CPAP machines are essential medical devices for sleep apnea treatment. Power consumption varies significantly based on whether the humidifier is enabled and the pressure settings used.
Typical Power
30W
Power Range
20-60W
Daily Usage
240Wh
(8 hrs/day typical)
CPAP Machine Runtime Calculator
Range: 20-60W
Continuous Runtime
27.2 hours
Days at 8hrs/day
4.0 days
Daily Consumption
240Wh
Usable Battery
960Wh
Recommended Equipment
* Calculations assume 85% inverter efficiency and 80% depth of discharge (LiFePO4).
Battery Runtime Examples
| Battery Size | Voltage | Runtime at 30W |
|---|---|---|
| 100Ah | 12V | 26 hours |
| 200Ah | 12V | 53 hours |
| 100Ah | 12V | 13 hours |
* Assumes 85% inverter efficiency and 80% depth of discharge for LiFePO4 batteries.
CPAP Machine Power Tips
- •Disable the heated humidifier to reduce power consumption by 50% or more
- •Use a DC-to-DC adapter instead of an inverter to improve efficiency by 15-20%
- •Most CPAP machines have a 12V DC input option - check your model
- •A 100Ah LiFePO4 battery can run a CPAP for 3-4 nights without humidifier
- •Consider a travel CPAP like the ResMed AirMini (20W) for off-grid use
Frequently Asked Questions
Can I run a CPAP on a portable power station?
Yes, most portable power stations can run a CPAP. For a full night (8 hours), you need at least 400Wh capacity. A 500Wh station provides comfortable margin.
How long will a 100Ah battery run my CPAP?
At 30W without humidifier: about 26 hours (3+ nights). With humidifier at 60W: about 13 hours (1-2 nights). Use our calculator for exact runtime.
Do I need a pure sine wave inverter for my CPAP?
Yes, CPAP machines require pure sine wave power. Modified sine wave can damage the motor and void your warranty.