CPAP on a Battery: How Many Nights Will You Actually Get?

Important: this page is about power and batteries only. It is not medical advice. Check with your doctor or CPAP provider before changing your therapy settings or running your machine from a battery. Disclosure: GoodGearDaily is reader-supported and may earn a commission from links on this page, at no extra cost to you. Specs and prices were checked in October 2026.

Those are averages. Your pressure, your room temperature and how you plug in all move the number. Set yours here:

The rest of this page goes through the questions that come up most often, in roughly the order people ask them.

My power brick says 90W. Doesn’t that mean my CPAP uses 90W?

No. The rating on the brick is the most it can deliver, not what your machine draws all night. Without heat, most CPAPs average somewhere between 20 and 40W, depending on pressure. Sizing a battery from the brick’s label makes you buy roughly three times more capacity than you need.

So what actually drains the battery?

Heat. The motor that pushes air is efficient. Warming water and the air in the tube is not. One RV owner measured a ResMed AirSense 10 with a heated humidifier and heated tube in a cold room and recorded about 1.17kWh over eight hours, roughly 146W on average. On that setup a 1,000Wh power station wouldn’t make it to morning. The same machine with heat off would run for four nights or more.

Many people sleep fine without heat for a night or two during an outage. Whether that’s okay for you is a question for your provider, not for us.

Should I plug into the AC outlet or the 12V socket?

The 12V socket, if your CPAP maker sells a DC converter or DC cord for your model. Through the AC outlet, the battery’s power gets converted to AC and then back to DC inside your power brick, losing energy both times. Going DC skips that and usually buys you around 8 to 10% more runtime. Use only the converter made for your machine.

Will the power station wake me up when the grid goes down?

Not if it has a fast UPS mode. Leave the CPAP plugged into the power station, and the power station plugged into the wall. When the grid drops, a unit that switches over in 10 milliseconds or less, like the EcoFlow DELTA 3 Plus or Bluetti Elite 100 V2, keeps the CPAP running without a hiccup. The Jackery Explorer 1000 v2 is listed at around 20ms, which most CPAPs ride through, but check before you rely on it.

Which size should I actually buy?

If you only need to cover one night, or you’re camping a night at a time without heat, a 300Wh-class unit is enough: the Jackery Explorer 300 v2, Bluetti Elite 30 V2 or EcoFlow RIVER 3 Plus. They’re light enough to carry to a tent.

If you want two to four nights of cover at home, or one night with the humidifier on, step up to 1,000Wh: the Bluetti Elite 100 V2, Jackery Explorer 1000 v2 or EcoFlow DELTA 3 Plus.

If you use a heated tube every night, or you live where outages last days, look at a unit you can expand. The DELTA 3 Plus takes extra batteries, and any of the 1,000Wh units pairs well with a solar panel.

What should I do before the next outage?

Sleep one test night on the battery. It’s the only way to learn your real number, and an inexpensive plug-in energy meter will show you the average watts to type into the calculator above. While you’re at it, ask your provider whether your machine is cleared for battery use, and top the power station up every couple of months so it isn’t half empty when you need it.

Need to keep more than your CPAP running? The power outage walkthrough adds a fridge, router and lights, and the camping calculator handles trips.

Sources

• RV Electricity: Power needed for a CPAP with heater/humidifier (owner measurement)
• Anker SOLIX: CPAP watt guide (typical wattage ranges)
• Manufacturer US product pages for each power station listed (capacity and UPS specs checked October 2026)