It is easy to put a phone on a battery bank when the lights go out. Planning for your CPAP feels different. You want to go to bed knowing how your equipment will get through the night, without turning your evening into an electrical engineering project.
I would start with the setup you already sleep comfortably with: your machine, your usual humidification, your tubing, and the hours you actually use it. Then I would work backward to the power supply.
That order matters. A battery can have plenty of stored energy and still be the wrong choice for your equipment. And a setup that runs a CPAP when you plug it in may not take over automatically during an outage.
Let’s work through those questions separately, so you know what to check before spending money.
Can a portable power station run a CPAP machine overnight?
A compatible portable battery system can supply enough energy for an overnight CPAP session. Whether a particular consumer power station is suitable depends on both manufacturers’ instructions, the exact connection, your overnight consumption, and the backup behavior you need.
There is no honest universal answer such as “every CPAP needs 500Wh.” Under the illustrative assumptions below, an eight-hour session averaging 40 watts at the AC outlet calls for about 495 watt-hours of nominal battery capacity. A session averaging 80 watts calls for about 940 watt-hours. Those are energy calculations, not approvals or tested product runtimes.
Before applying either number, check that the equipment is intended for the job. Some power-station manufacturers specifically advise against medical-device use.
Three separate checks.
First, make sure the proposed backup is appropriate for your machine
Imagine we are looking at two boxes together. One says “CPAP,” and the other says “1,000Wh.” Those labels do not tell us whether the two should be connected.
I would want the exact CPAP model, the power accessory you plan to use, and the exact battery model. “ResMed” or “Jackery” alone is not enough; models within a brand can have different connections, restrictions, and behavior.
The FDA’s guidance for medical devices during power outages advises checking the device instructions or asking the manufacturer or distributor whether a battery or generator can be used. That is the starting point I would use here.
Why I would not choose a CPAP battery from a runtime chart alone
Here is a concrete example. The FAQ on Jackery’s Explorer 1000 v2 product page advises against using its portable power stations with medical devices. Its wording extends beyond life-support equipment.
That matters even if you have seen a CPAP pictured in an advertisement or read an owner’s positive experience. Neither establishes manufacturer support for your setup. We cannot responsibly recommend the Explorer 1000 v2 for CPAP use against that guidance.
If product instructions and marketing appear to disagree, ask the manufacturer to clarify the exact proposed use in writing. Until the conflict is resolved, choose a supported alternative with your CPAP equipment provider.
The Explorer 1000 v2 is shown here to illustrate that check. Jackery’s product FAQ advises against medical-device use; this image is not a CPAP recommendation.
Give your equipment provider a specific question
Instead of asking, “Can I run this on a battery?” ask:
“I use this exact CPAP model with this humidifier and tubing. I need power for this many hours. Which battery and power accessory support that setup, and can they provide the automatic backup I need?”
Your equipment provider is the supplier that helps with your CPAP machine and accessories. They can help identify supported power options; your clinician can advise on your treatment and outage plan.
This guide addresses ordinary CPAP backup planning. If you use a ventilator, another form of respiratory support, supplemental oxygen, or equipment whose interruption could be dangerous, have your care team specify the complete backup arrangement. A CPAP energy example cannot establish suitability for those systems.
Build the plan around your normal night
Before looking at capacity, write down what needs power and for how long. You do not need to know every electrical detail yet. You need a clear description of the night you want the battery to cover.
- Your exact machine: include the model, rather than just the brand.
- Your usual accessories: humidifier, heated tubing, and the intended power supply or converter.
- Your expected usage: count the full session and any additional sleep periods you need to cover.
- Your location: bedroom, RV, or campsite, including expected temperatures.
- Your backup goal: a planned battery-powered night, automatic takeover during an outage, or several nights between charges.
If your usual session is nine hours, calculate nine hours. An eight-hour chart is only an example. Likewise, a battery that covers one night does not automatically cover a weekend.
I would keep your usual therapy setup as the baseline. Humidification and heated tubing can change the energy requirement, but changing treatment or comfort settings to squeeze into a smaller battery is a discussion for your equipment provider or clinician. Do not reduce prescribed pressure to save electricity.
This is also where I would separate your CPAP budget from the rest of the household. A battery earmarked for overnight use should not quietly become the battery everyone uses for lights, laptops, and cooking beforehand.
How many watts does a CPAP machine use?
The useful answer is the consumption of your complete setup over time. A single number on a power brick cannot tell you that.
There are two electrical terms worth getting comfortable with:
- Watts, or W: how quickly equipment is using energy at a particular moment.
- Watt-hours, or Wh: how much energy it uses over a period of time.
If a complete setup averages 40W for eight hours, it uses 320Wh at the point where that power is measured. It does not have to draw exactly 40W every second for that average to be useful.
The distinction also explains why a station’s large output rating is not an overnight runtime promise. A “1,500W” label describes output capability. Its battery capacity is a separate specification. Our home backup sizing guide explains that distinction across household appliances.
What an AirSense 11 specification actually tells you
The ResMed AirSense 11 user guide lists a 65W power supply, 56.1W typical consumption, and 73.2W peak consumption in its technical specifications. Those figures describe different things; “65W” is not a statement that the machine draws exactly 65 watts throughout your sleep.
I would use the documentation to understand electrical requirements, then seek consumption guidance for your actual configuration. A manufacturer’s typical figure is useful context, but it is not a personalized overnight measurement or a guaranteed maximum for every operating condition.
Get an energy number that matches the connection you will use
Ask your equipment provider for model-specific battery guidance first. Where appropriate and permitted, a correctly rated plug-in energy meter can record the complete AC setup’s consumption during normal use on reliable mains power. Follow the equipment instructions; you do not need to deliberately interrupt treatment to collect useful information.
Record the session length, energy used, usual accessory settings, and relevant room conditions. More than one representative night can reveal variation that a single reading misses. Use a conservative planning value rather than picking the lowest result.
If the meter shows 0.32 kilowatt-hours, that is 320 watt-hours. Divide 320Wh by eight hours and you get a 40W session average.
A reading at the AC outlet includes the CPAP power supply’s losses. It does not include the losses inside a battery station that was not supplying that outlet. Keeping those two sides separate prevents some very optimistic runtime estimates.
A brief demonstration that the machine powers on is a compatibility observation, not an overnight energy measurement. The station’s live watt display is also only a snapshot unless it records energy over the whole session.
What size battery would cover the night?
Once compatibility is established, the calculation becomes much easier. Start with the energy the CPAP setup needs, account for the battery system’s own consumption and conversion losses, and leave a reserve.
Here is an illustrative AC-powered example. These assumptions are chosen to explain the method; they are not measurements of a particular product:
- Eight hours of operation, with the battery fully charged at the start.
- 90% conversion efficiency from the battery to the AC output, excluding the separate station overhead below.
- 5W of additional station overhead while the AC output is operating.
- 20% of nominal battery capacity left as an unused reserve.
Under those assumptions:
Required nominal capacity = [(AC energy ÷ 0.90) + (5W × operating hours)] ÷ 0.80
The word “nominal” means the advertised battery capacity. The full advertised amount does not arrive at the CPAP’s AC plug.
Walk through a 320Wh night with me
Our example CPAP setup uses 320Wh at the AC outlet over eight hours.
- Account for conversion: 320Wh ÷ 0.90 is about 356Wh drawn from the battery for that output.
- Add station overhead: 5W × 8 hours adds 40Wh, bringing the estimated battery draw to about 396Wh.
- Keep a reserve: 396Wh ÷ 0.80 gives a nominal capacity requirement of about 495Wh.
Notice how close that is to a 500Wh battery. In this example, 500Wh only just clears the calculated requirement. It gives little additional room beyond the chosen reserve for a longer night or assumptions that turn out to be optimistic.
That does not make a larger battery automatically suitable. It means I would avoid treating the smallest mathematically qualifying capacity as a comfortable guarantee.
needs a larger battery
Eight-hour sizing examples
| Average draw at AC outlet | Energy for 8 hours | Calculated nominal battery capacity |
|---|---|---|
| 20W | 160Wh | About 275Wh |
| 40W | 320Wh | About 495Wh |
| 60W | 480Wh | About 720Wh |
| 80W | 640Wh | About 940Wh |
Each row uses the same 90% conversion efficiency, 5W station overhead, and 20% reserve, with results rounded upward. The wattages are hypothetical averages. They do not represent specific machines, humidity settings, or clinical prescriptions.
Actual usable energy depends on the equipment, load, temperature, battery condition, and settings. Small loads can expose a station’s overhead more clearly than large ones. Use documented or appropriately verified figures for the system you are considering.
If the manufacturer supplies measured usable AC energy at a comparable load, check what it already includes. Do not deduct the same inverter losses and overhead a second time. And if battery capacity has declined with age, base the plan on its current usable performance, not its original label.
AC outlet or DC converter: which connection makes sense?
AC is the wall-outlet style connection most people recognize. A supported AC arrangement uses the CPAP’s correct power supply, with the battery system providing an appropriate AC source.
The energy takes a few steps: battery DC becomes AC in the station, then the CPAP power supply converts it to the DC the machine needs. The station’s inverter is the component that makes the AC.
A supported DC arrangement may avoid that AC conversion stage. That can improve efficiency, but the result depends on the converter and source. I would not promise a fixed percentage improvement or “twice the nights” without evidence for the actual setup.
The right converter is specific to the machine
ResMed’s Air11 DC/DC converter guide describes a converter specifically for Air11 devices, intended for suitable 12V or 24V vehicle auxiliary power sources. Its technical ratings include 12V/10A or 24V/5A input and 24V/3.75A output.
Those are connection and electrical ratings, not a statement that your CPAP constantly consumes 90W. A source with a similar-looking socket is not automatically a supported pairing. The intended source, current capability, connector, and operating instructions all need to match.
The AirSense 11 guide also warns against inserting a USB cable into the device. Do not choose a generic USB-C cable or a universal DC lead because the plug looks familiar.
For older equipment, ResMed’s 2018 deep-cycle battery guide includes model-specific tables and converter part numbers for devices such as the Air10 series. Its converter tables assume eight hours of use and already include a 50% safety margin. That guide does not cover AirSense 11, and its battery figures should not be transplanted into a modern power-station chart.
For a DC setup, calculate energy using the DC source and converter’s actual requirements and losses. Do not reuse the AC example’s 90% figure simply because it is convenient. Different routes through the equipment need different energy budgets.
Will the CPAP stay on when the electricity goes out?
This is a separate purchase decision from running on a battery at bedtime.
If you connect a supported battery before going to sleep, your question is whether that arrangement can supply the whole session. If you want the machine to switch from mains power automatically at 2 a.m., the behavior during the changeover also matters.
“Pass-through charging” usually describes supplying equipment while the battery system itself is connected to charging power. That label alone does not establish automatic transfer, uninterrupted output, or CPAP compatibility.
Even a stated UPS function needs closer reading. UPS means uninterruptible power supply, but advertised transfer behavior varies. A short transfer time on a product page does not prove that your medical equipment will continue operating correctly.
Ask the manufacturers or your equipment provider to confirm:
- Whether the exact arrangement supports continuous connection and automatic backup.
- What happens to the relevant output when mains power disappears and returns.
- Whether your CPAP continues, stops, or needs a manual restart.
- What happens after low battery, overload, or another protective shutdown.
- How you will know that backup power has taken over or is running low.
Our portable power station versus UPS guide explains the general differences. For CPAP, the equipment-specific instructions still decide the appropriate arrangement.
I would arrange any compatibility or transfer checks through the equipment provider’s recommended procedure, while reliable normal power is available. Do not discover the behavior by cutting power during sleep or interrupting prescribed therapy as an experiment.
Check the small details that matter at bedtime
Once the main electrical questions are answered, think about what using the setup will feel like in your bedroom.
Output timers and low-load shutoff
Some battery systems switch outputs off after a period of low demand or inactivity. Look for settings called energy-saving mode, eco mode, output timeout, or automatic shutdown. An outlet can stop supplying power while energy remains in the battery.
Confirm the correct settings for the supported arrangement, including whether settings persist after a restart. Follow the manufacturer’s procedure; bypassing a protection feature is not a substitute for compatibility.
Noise, placement, and access
A power station may have a cooling fan even though it has no engine. Check fan behavior during both charging and discharge, display brightness, and alarms. A unit that feels unobtrusive in the afternoon may be more noticeable beside your bed.
Follow the placement, ventilation, separation, and moisture instructions for every component. Leave controls accessible and route cords so you will not trip over them in the dark. Keep the power supply away from places where water could spill.
Do not cover the battery or converter with bedding to quiet a fan or hide a light. Also consider whether you can comfortably move the unit and reach its buttons. Those practical details affect whether the plan is easy to maintain.
A plan for a longer interruption
Keep your supplier’s contact details and your care team’s outage instructions somewhere accessible. Agree on what to do if the supported backup is unavailable, cannot be recharged, or stops working.
Extra battery capacity helps with duration. It does not remove the need for a response when a cable, output, or battery fails. If continuity is medically critical, let the care team define the required backup and escalation plan.
What changes if you need two nights or a weekend?
Count the sessions before assuming a daily charging opportunity will work out.
Using our same 320Wh-per-night AC example, two eight-hour nights require 640Wh at the outlet. With the same illustrative conversion efficiency and 16 hours of station overhead:
[(640Wh ÷ 0.90) + (5W × 16 hours)] ÷ 0.80 ≈ 989Wh nominal capacity.
Rounded upward, that is about 990Wh. Again, a nominal 1,000Wh battery barely clears this particular planning calculation; it is not a two-night guarantee.
This example counts only 16 hours with the AC output operating. If the system remains energized between sessions, include that additional consumption. Only turn outputs off between uses where that fits the supported setup and your backup plan.
The reserve is held at the end of the two-night period. We have not assumed a recharge between nights, and we have not applied a fresh reserve multiplier every night.
For a weekend away, I would also count the travel day and the return journey. A battery that starts the trip partially charged, supplies other appliances along the way, and reaches the campsite late has a different starting budget.
Can solar panels recharge the battery for the next night?
Solar can be part of a supported battery charging plan. The important question is how much energy reaches storage before the next session, under the conditions you actually have.
Panels recharge during daylight; the charged battery supplies the night. A panel’s wattage rating is not a promise of that output from sunrise to sunset.
Here is a hypothetical daytime budget: a 200W array, four peak sun hours, and an assumed 70% overall yield into battery storage would provide:
200W × 4 hours × 0.70 = 560Wh stored.
Four peak sun hours means the day’s sunlight is equivalent to four hours at the reference intensity. It does not simply mean four hours on the clock. The 70% factor here is an illustrative allowance for the overall charging path and real-world conditions, not a specification for your panels.
Our earlier night consumed about 396Wh from the battery, so 560Wh would replace that draw under these assumptions. A 100W panel with the same assumptions would store 280Wh, leaving a shortfall of about 116Wh.
Clouds, shade, winter conditions, input limits, and charging temperature restrictions can change the result. I would not make tomorrow night’s therapy depend on an optimistic weather estimate. Plan a supported alternative charging source or enough stored energy for the period your care plan requires.
Our guide to how many solar panels you need covers the energy budget in more detail. Check electrical compatibility as well as panel wattage.
What I would have in hand before buying
By this point, you should be able to explain the proposed setup in ordinary language. “This is my machine, this is the supported connection, this is the energy I need, and this is what happens if the power goes out.”
I would take this short checklist into the buying decision:
- Confirmed suitability: the exact CPAP, power accessory, and battery arrangement fit the manufacturers’ intended use.
- A realistic energy budget: full session length, usual accessories, losses, overhead, and reserve are included.
- Known backup behavior: manual connection or automatic takeover is understood and appropriate.
- A workable bedside setup: output settings, placement, noise, and access have been considered.
- A charging and outage plan: you know what happens after the first night and if the backup cannot provide power.
If a dedicated CPAP battery is the supported choice, evaluate it on those same questions. A category name alone does not guarantee sufficient runtime with your particular accessories.
We can help you read the electrical specifications of power stations we carry. Your CPAP supplier and clinician should establish the appropriate medical-device power arrangement. Bring their requirements when you contact Grid Getaway, so the conversation starts with what your equipment actually needs.
Questions you may still have
Will a 300Wh power station run a CPAP for eight hours?
The capacity could cover some lower-energy scenarios, but capacity alone cannot establish suitability. Our hypothetical 20W AC example calculates to about 275Wh with the stated losses and reserve; the 40W example calculates to about 495Wh. Verify the supported equipment and actual consumption before applying either result.
Is 1,000Wh enough for a CPAP?
It depends on session length, consumption, usable capacity, connection losses, and reserve. In our examples, 1,000Wh only narrowly exceeds the calculated requirement for two 320Wh nights or one 640Wh night. It is not a universal runtime or compatibility guarantee.
Should I turn off the humidifier to make the battery last longer?
Start by sizing for the setup you normally use. Discuss any proposed changes with your equipment provider or clinician; do not change prescribed therapy to fit a battery purchase. If a different configuration is appropriate, calculate its energy requirement separately.
Can I use an ordinary phone power bank?
Do not assume so. The complete power source and accessory must support the machine’s electrical requirements and intended use. A familiar USB connector or a large milliamp-hour number does not establish that. Compare supported options using watt-hours and the correct connection documentation.
Can I leave the battery connected all the time?
Only if the exact system’s instructions support that operating arrangement. Confirm charging behavior, automatic transfer, output settings, and any maintenance requirements. “It charges while something is plugged in” does not answer all those questions.
Choose the setup around the night you actually need
I would want you to finish this decision with more than a battery that looks big enough on paper. You should know that the connection is supported, that the energy budget covers your normal use, and that the outage behavior fits your needs.
Start with your exact equipment and your usual night. Confirm the appropriate power arrangement with your CPAP supplier. Then choose capacity with a clear allowance for losses, variation, and reserve.
That gives you a much better buying decision than a generic promise of “eight hours of CPAP.” It gives you a plan you can explain, check, and maintain.
