What is the best backup power for a CPAP during a power outage

For short outages (under 8 hours), a CPAP-specific battery like the Medistrom Pilot-24 Lite is compact and efficient. For multi-day outages, a portable power station with 300Wh or more gives you more runtime and versatility. A UPS works for brief outages but doesn't last the whole night.

Can I use a UPS for my CPAP machine

Yes, but with limitations. A standard home UPS (like an APC 600VA) will run a CPAP for 30-90 minutes — long enough for brief outages but not a full night. For true overnight backup, you need a higher-capacity battery or portable power station.

How long will a CPAP run on a battery during a power outage

It depends on the battery size and your settings. A 100Wh battery (like the Jackery 240 or similar) runs most CPAPs 4-8 hours without a humidifier. A 300Wh unit can run 12-20 hours. Turn off the heated humidifier to maximize runtime.

Will my CPAP automatically switch to battery when the power goes out

Not unless you have a UPS with automatic switching, or a CPAP-specific battery with auto-transfer built in. Most portable power stations require manual connection before an outage. The Medistrom Pilot-24 Lite has automatic transfer when set up correctly.

CPAP power outage prep: batteries, UPS units, and what actually works

Power outages at night are more common than people expect — storms, grid failures, and rolling blackouts don't wait until morning. If you rely on CPAP therapy, one night without it isn't just uncomfortable. It's a health issue.

Here's how to stay covered.

Three options for CPAP backup during power outages

Option 1: UPS (Uninterruptible Power Supply)

A UPS is a device that sits between your wall outlet and your CPAP. When power cuts out, it instantly switches to battery — no interruption, no restarting your machine.

The catch: standard home UPS units aren't built for all-night CPAP use. A 600VA UPS (common household size) will run a CPAP for 30 to 90 minutes depending on your pressure settings and whether the humidifier is on.

When a UPS makes sense: if your area has brief, frequent outages (brownouts, flickering power) and you want seamless auto-switching without doing anything manually.

Best UPS options for CPAP:

APC BE600M1 (600VA): Runs most CPAPs 45-90 min without humidifier. About $80. Good for short outages.
CyberPower CP1500PFCLCD (1500VA): More capacity, runs CPAPs 3-4 hours. About $200. Better for extended outages.

UPS limitations: they're heavy, not portable, and still won't get most people through a full night at typical capacity.

Option 2: CPAP-specific batteries

Batteries designed specifically for CPAP use. They're lightweight, often FAA-carry-on approved, and some include automatic transfer features.

Best options:

Medistrom Pilot-24 Lite: Works with most ResMed and Philips machines. About 1.4 lbs, 95Wh, runs 8-16 hours without humidifier. About $200. Has automatic transfer capability. Best all-around CPAP battery.
Jackery Explorer 240: 240Wh, runs CPAPs 10-20 hours, powers other devices too. About $160 on sale.
ResMed Power Station II: Made for ResMed machines specifically. Built-in 12V DC output, no inverter needed. About $300.

Best for: anyone who wants a dedicated CPAP backup that's easy to store, travels well, and lasts the night.

Option 3: Portable power stations

General-purpose batteries with AC outlets, USB, and 12V ports. They run your CPAP plus anything else you need during an outage — phone, lights, a fan.

Best options by budget:

Station	Capacity	CPAP runtime (no humidifier)	Price
EcoFlow River 2	256Wh	12-20 hours	~$200
Jackery Explorer 300 Plus	288Wh	14-22 hours	~$250
Bluetti EB3A	268Wh	12-20 hours	~$200
EcoFlow River 2 Pro	768Wh	3-5 nights	~$500

Best for: households that want one solution for CPAP backup AND general emergency power. Slightly heavier and larger than CPAP-specific batteries, but more versatile.

The humidifier decision

This is the single biggest factor in how long your backup lasts.

A CPAP with a heated humidifier draws 40-80 watts. The same CPAP without the humidifier draws 5-20 watts. That's a 4-8x difference in power consumption.

During a power outage, turn off the heated humidifier and use a cold pass-over configuration if you need moisture. You'll multiply your backup runtime dramatically.

Most modern CPAPs (ResMed AirSense 10/11, Philips DreamStation) let you disable the humidifier in settings. It takes 30 seconds.

What to set up before an outage hits

Step 1: Know your CPAP's power draw. Check the label on the back of the machine or the manual. Look for watts or amps. If you see amps, multiply by 12 (for 12V DC) or 120 (for AC) to get watts.

Step 2: Calculate your runtime needs. How many nights do you need coverage? Most people want one full night minimum, two nights to feel secure.

Step 3: Pick your solution.

Short outages only → UPS or small CPAP battery (100Wh)
One full night → CPAP battery or 250-300Wh power station
Multi-night coverage → 500Wh+ power station

Step 4: Test it before you need it. Plug your CPAP into your backup solution and run it for a night while connected to wall power. Confirm runtime meets your needs before a real outage.

Step 5: Keep it charged. An uncharged backup is useless. Most power stations hold their charge for 6-12 months. Top them off every few months.

Bottom line

For most CPAP users, a 250-300Wh portable power station covers everything — one to two nights of backup, works with any machine, and doubles as emergency power for phones and lights.

If you travel frequently and want something compact and CPAP-optimized, the Medistrom Pilot-24 Lite is the most purpose-built option on the market.

Whatever you choose, set it up and test it now. The night of an outage isn't the time to figure out cables.