CPAP Runtime Calculator
How many nights can your portable power station run your CPAP? Select your pressure and humidifier settings, choose AC or DC mode, and get an instant estimate. DC adapters roughly double your runtime.
CPAP Runtime
9.75
hours total
1 full night
at 8 hours per night
DC adapter tip
You're using DC mode — great choice. This gives you ~8% more runtime than AC. Most ResMed and Philips CPAPs support 12V or 24V DC adapters.
Minimum battery for 8h (1 night)
629 Wh
At 65W via DC with 10% reserve
Assumptions
- CPAP draw: ~65W (Humidifier on medium, moderate pressure)
- Efficiency: 92% (DC — no inverter loss)
- Reserve: 10%
- Usable: 707 Wh → After reserve: 636 Wh
CPAP power draw varies by machine model, pressure setting, humidifier level, altitude, and mask fit. Always test your setup for a full night before relying on it. Consult your CPAP manual for DC adapter compatibility.
Stations for 8+ hours of CPAP (65W via DC)
These stations meet or exceed 629Wh. Prices link to Amazon.
Important: Test any battery with your CPAP for one full night at home before relying on it during an outage or trip.
CPAP Runtime
1 night
65W via DC
9.75h total
FAQ
How long can a portable power station run a CPAP?
A 500Wh station can power a CPAP without humidifier (25-40W) for 2-3 nights via DC adapter, or about 1.5 nights on AC. With the heated humidifier on high (90W), expect 1 night on a 500Wh battery.
Should I use AC or DC power for my CPAP?
DC whenever possible. DC bypasses the inverter, eliminating 15% efficiency loss. Most ResMed AirSense and Philips DreamStation machines support 12V or 24V DC adapters sold separately.
What size power station do I need for a CPAP?
For one night without humidifier: 200-300Wh is enough. For one night with humidifier on medium: 400-500Wh. For 2-3 nights: 700Wh+. Always use DC mode and leave a 10% reserve.
Can I use my CPAP during a power outage?
Yes — this is one of the best use cases for a portable power station. Look for a model with UPS/EPS mode (under 20ms switchover) so your CPAP stays on seamlessly when power cuts out.