How to Keep Your CPAP Running During a Home Power Outage
The short answer: power your CPAP from a battery with the correct DC cord for your machine, turn off the humidifier and heated hose, and you can sleep through the outage. Both EXP PRO APEX batteries support pass-through charging, so on a night when an outage looks likely you can leave the battery plugged into the wall and the CPAP plugged into the battery. If the power drops, the battery switches to battery power automatically. No moving plugs in the dark.
The rest of this article covers how pass-through works, which battery fits your household, how to stretch every charge, and how to keep the battery ready between storms.
Start with the honest version of the risk
NOAA's Climate Prediction Center puts the Atlantic hurricane season at June 1 through November 30, with the climatological peak running August through October. In its updated outlook issued August 6, 2026, NOAA called for a below-normal season: a 75% chance of below-normal activity, 7 to 13 named storms, 2 to 6 hurricanes, and 0 to 2 major hurricanes, driven by a strengthening El Niño.
That's genuinely good news, and it tells you nothing about your street. A quiet season is a statement about basin-wide storm counts, not about the maple limb over your service drop or the substation fault three towns over.
The more useful number comes from the U.S. Energy Information Administration. Across 2024 — the most recent full year available — the average U.S. electricity customer experienced about 11 hours of interruption, the most in ten years, with hurricanes doing most of the damage. Roughly 9 of those 11 hours came from major event days. Strip those out and the routine, ordinary-Tuesday number is about 2 hours a year, spread across an average of 1.5 interruptions per customer.
Two hours is a nuisance. Nine hours concentrated into one bad night is the night you don't sleep. Both are worth a plan, and the plan is the same either way.
You're also not an unusual case. HHS's emPOWER Program tracks more than 3 million Medicare beneficiaries who rely on electricity-dependent durable medical equipment — BiPAP machines are explicitly among the tracked equipment — and more than 4.6 million people classified as at-risk when dialysis, home oxygen, home health and hospice are counted. Emergency managers pull that map monthly. Preparing for an outage isn't catastrophizing. It's the same category of ordinary competence as keeping a spare tire.
Why a battery, and not a generator, is what runs beside your bed
A portable generator is a fine tool for a refrigerator and a window unit. It is not a tool for a bedroom.
The Consumer Product Safety Commission, in a release dated February 10, 2025, reported an average of about 100 deaths a year in the U.S. from carbon monoxide poisoning caused by portable generators. CPSC's guidance is blunt and worth repeating exactly: never run a generator inside a home, garage, basement, crawlspace or shed. Opening doors and windows does not provide adequate ventilation. Operate it outdoors, at least 20 feet from the house — a porch or a carport is too close. If you do own one, CPSC points toward models certified to PGMA G300-2018 or UL 2201.
So the generator lives 20 feet away in the rain, and you're running an extension cord to a machine you'll be breathing through all night. A battery is the thing that can actually sit on the nightstand: silent, no fuel, no exhaust, no cord through a window.
There's an efficiency argument too. Running a CPAP off a battery through an AC inverter means converting DC to AC and then letting the machine's power brick convert it back to DC — you pay a conversion penalty twice, in a situation where every watt-hour is a fraction of a night. Powering the CPAP directly over DC skips both conversions. We've written that comparison out in detail in Using an Inverter vs. Direct DC Power. For outage planning, treat direct DC as the default and the inverter as the exception.
Set it up so the battery switches over for you
Both APEX batteries have pass-through charging: the battery charges from the wall and powers your CPAP at the same time. When wall power drops, the battery detects it and switches to battery power automatically.
The setup is simple. The battery's charger goes into the wall, the CPAP's DC cord goes into the battery, and you go to bed. The battery keeps itself topped up while the grid is on and carries the load when it isn't.
Two things to know. First, save pass-through for the nights you're actually concerned about an outage — a storm in the forecast, a planned shutoff — rather than running it every night. That's easier on the battery over the long run. Second, test the setup at home once before you rely on it, and talk with your sleep provider or equipment supplier about backup power for your specific therapy needs.
Sizing: how many nights do you actually need?
Here's what the two EXP PRO batteries do on a CPAP, with the humidifier and heated hose switched off.
EXP48PRO APEX — 153.6 Wh, 12.8 Ah at 12V, about 3.25 lb. One DC output port, 12V at 10A continuous and 15A peak, switchable to 24V. USB-C in and out plus two USB-A. An LCD shows battery percentage and current output voltage. Estimated 2 to 3 nights of CPAP runtime. $399 bundled with the CPAP DC cord.
EXP96PRO APEX — 307.2 Wh, 25.6 Ah at 12V, about 6.5 lb. Two DC output ports, so it runs two CPAP or BiPAP machines at once — the reason it's usually the right answer for couples. Output at 5V, 9V, 12V, 15V and 24V, one USB-A and two USB-C, same LCD readout. UL 2743 and ANSI certified, IP65 rated. Estimated 4 to 6 nights with auxiliaries off, and roughly 1 night with both the humidifier and heated hose running. $549 bundled with the CPAP DC cord. It is not airline-eligible, which for a home backup unit is beside the point.
Every runtime figure above is an estimate. Your actual hours depend on your pressure, your mask fit and leak rate, your machine's efficiency and how cold the room is. Treat the ranges as planning numbers, not promises.
Most single-user households in a typical outage region are well served by an EXP48PRO. If two people in the house are on therapy, or you're in an area where multi-day restoration is normal after a storm, the EXP96PRO's second port and larger reserve is the more comfortable choice.
The single decision that stretches your runtime the most
Turn off the heated humidifier and the heated hose.
Heat is where the watt-hours go. The difference is stark enough on the EXP96PRO to state plainly: an estimated 4 to 6 nights with auxiliaries off, versus roughly 1 night with both heat elements running. Same battery, same machine.
The comfortable substitute is a heat and moisture exchanger, a passive inline filter that captures warmth and humidity from your exhaled breath and returns it on the next inhale. It draws no power at all. Plenty of people find it perfectly livable for a few nights, and it's the standard trick for stretching a battery. We covered how they work and who they suit in Why Would I Consider an HME?
Anything about your pressure settings, your ramp, or whether a change in humidification is right for you belongs with your sleep provider or equipment supplier. We make power, not therapy decisions.
Get the cord right — this is where people get stuck
The cord is specific to your CPAP model, not to the battery. This is the most common ordering mistake we see, and it's almost always a generation mismatch: an AirSense 10 cord bought for an AirSense 11, or a DreamStation cord bought for a DreamStation 2.
Both APEX batteries power most major machines through the correct DC cord — the ResMed AirSense 10 and 11 families, AirCurve 10 and 11, AirMini and S9; Philips Respironics DreamStation, DreamStation 2 and System One 60 Series; Resvent iBreeze; Breas Z1 and Z2; React Health Luna G3 and TravelPAP; Transcend Mini and Micro.
Never infer compatibility from voltage alone. Find the exact model name on the label of your machine, including the generation number, and match the cord to that. If you're not certain, ask us before you order — it's a two-minute conversation and it saves a return.
Then, and this is the part people skip: plug it in and run a full night on battery once, before you need it. You want to discover the wrong cord in September, not at 2 a.m. in November.
Call your utility before the season, not during it
Most large utilities operate a medical certificate or life-support program for customers who depend on electricity for medical equipment. The details vary a lot by utility, so ask yours directly what it's called and what it does.
As a concrete example of what these programs can look like: PG&E's Medical Baseline Program bases eligibility on medical condition rather than income, counts respiratory and breathing devices among qualifying equipment, gives enrolled customers roughly 500 additional kWh per month at the lowest rate tier, and provides enhanced outage notifications during Public Safety Power Shutoffs. That's PG&E specifically — don't assume your utility's version matches.
Worth being clear about what enrollment does and doesn't do. It can mean earlier warning and a lower bill. It does not guarantee your power stays on, and it doesn't put you at the front of the restoration queue. It's an input to your plan, not a substitute for one. Ready.gov's general emergency guidance makes a similar point in recommending that anyone using electrically powered medical equipment talk through an outage plan with their medical provider ahead of time.
Keep the battery ready between storms
A backup battery that's been in a closet since last spring at 4% charge isn't backup.
Store it at 40–50% charge if it'll sit for more than three months, and recharge it at least once every three months while stored — that maintenance interval is a warranty condition, and missing it voids the warranty. Set a recurring calendar reminder on the first of the quarter and it takes care of itself.
A few other limits worth knowing: don't charge below 32°F, keep the ambient temperature in the 40°F–110°F range for best results, and never above 120°F. Never charge a battery that's bulging or visibly damaged.
LiFePO4 tolerates this kind of sit-and-wait duty better than ordinary lithium-ion, which is a large part of why we use it — up to 5,000 cycles on the EXP48PRO, and a chemistry that degrades less at a moderate storage charge than at full or empty. More on that in Maximizing the Lifespan of Your LiFePO4 Batteries and Why Do EXP PRO Batteries Use LiFePO4?
If a multi-day outage is realistic where you live, a folding monocrystalline solar panel closes the loop. The Summit 60W ($139) recharges an EXP48PRO in under about 5 hours of good sun; the Summit 100W ($219) brings an EXP96PRO back in under about 4.5 hours. Both fold flat into a closet the other 51 weeks of the year.
Your storm-season checklist
- Confirm your CPAP's exact model and generation, and get the matching DC cord.
- Run one full night on battery now, as a test.
- Decide your low-power configuration in advance — humidifier off, heated hose off, HME if you use one — and keep the HME with the battery.
- When a storm is in the forecast, charge the battery to full and set up pass-through: charger in the wall, CPAP plugged into the battery.
- Keep the battery on the nightstand with the CPAP already plugged into it, so when the power drops the battery handles it.
- Ask your utility about its medical certificate or life-support program.
- Calendar reminder: recharge every three months in storage.
- If you own a generator, it runs outdoors only, 20 feet from the house, never in a garage.
Do the setup before bed, and the battery takes care of the switchover.
Building your home backup setup? Start with your CPAP's exact model, and we'll make sure the right cord is in the box the first time.
Frequently asked questions
Will the battery switch over automatically when the power fails?
Yes, when it's set up for pass-through: the battery on its charger in the wall, and your CPAP plugged into the battery. When wall power drops, the battery switches to battery power automatically. We recommend using pass-through on nights when an outage is a real possibility rather than every night, and testing the setup once at home before you rely on it.
How many nights will an EXP48PRO run my CPAP?
An estimated 2 to 3 nights with the humidifier and heated hose off. It's an estimate — pressure, leak rate and machine model all move the number.
Can one battery run two CPAPs?
The EXP96PRO APEX has two DC output ports and can run two CPAP or PAP devices at once. The EXP48PRO has one DC output port.
Do I need a different battery for a BiPAP?
No. Both APEX models power most major CPAP and BiPAP machines, including the ResMed AirCurve families, through the correct model-specific DC cord.
Can I use an extension cord to a generator instead?
You can, but a generator must run outdoors at least 20 feet from the house per CPSC guidance, never in a garage or shed. A battery is the option that can sit next to the bed.
How often do I have to charge it if I'm just keeping it for emergencies?
At least once every three months, stored at 40–50%. Missing that interval voids the warranty.
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