Capacity in watt-hours is the whole decision. Size it to your nights and your humidifier, and a power station runs your CPAP off-grid without a hookup. Here is how to get it right, plus five units worth buying.
Updated June 2026·14 min read·Built around real CPAP power draw, not spec-sheet marketing
Powering a CPAP in a tent, a van or a remote cabin is not complicated once you stop shopping by brand and start shopping by one number: watt-hours of capacity. A CPAP itself is a light load. The blower motor sips power. What trips people up is the heated humidifier and heated tubing, which are small electric heaters bolted onto a small fan, and they can easily use more energy across a night than the machine they are attached to.
So this page does not hand you a ranking and walk away. It starts with a capacity picker that asks the three questions that actually move the number, your humidifier, your nights off-grid and what you care about most, and points you at a tier and a unit. Then it shows the simple math behind that number so you can sanity-check it for your own machine, compares five real power stations on the specs that matter, and is honest about when a given unit is the wrong tool.
One thing up front. This is a guide to powering the device away from the wall, for camping, road trips and off-grid stays. It is not medical advice and it does not touch your therapy. For anything about pressures, masks, humidity settings or whether your machine is safe to run on battery, ask your CPAP provider or doctor. The figures here are approximate planning numbers, useful for sizing a battery, not clinical specifications.
Interactive
Size your portable power station for CPAP camping
Set the three things that move the number, your humidifier, your nights off-grid and what you care about most. The picker returns a target capacity tier and the unit that fits.
Answer three questions
Your target capacityAbout 300Wh
Suggested unit
Jackery Explorer 300 Plus
about 288Wh, around 8 lb
One humidifier-free night needs roughly 300Wh, and at around 8 lb the 300 Plus is the lightest unit that covers it, ideal if you carry your gear any distance.
A sizing guide, not medical advice. For therapy questions, ask your CPAP provider.
The math
The only number that matters: watt-hours per night
Watts are how fast a device pulls power. Watt-hours (Wh) are how much it uses over time, and a power station is rated in Wh. Get the watt-hours per night right and capacity choice becomes obvious.
A CPAP blower on its own draws roughly 30 to 60W depending on your pressure and how hard the motor has to work. Run that across an eight-hour night and the raw draw is somewhere around 240 to 480Wh. In practice a good working figure for a humidifier-free night is about 300Wh, which already builds in a little slack for the power lost converting battery DC into wall-style AC. Lower pressures and a machine running off DC can come in well under that, which is why some campers get more nights than the math suggests.
The heated humidifier is where the budget blows up. It is a resistive heater warming a tank of water, and a heater is a far hungrier load than a small fan. Switched on, it can add as much again as the blower or more, pushing a single night past 500 to 600Wh on its own. Heated tubing is a second heater layered on top. Run the humidifier and heated hose together on a cold night and one night of sleep can use what the bare blower would spread across two or three.
Two smaller factors shave the rest. Running through the AC inverter wastes roughly 10 to 15% as heat, so a unit's usable output is always a bit less than its sticker capacity. If your machine supports a DC input, feeding it from the power station's 12V output skips the inverter and claws some of that loss back, stretching runtime. Plan with the AC figure to stay safe, and treat any DC saving as a bonus.
Blower only
About 300Wh per night
30 to 60W across roughly eight hours, with a margin for inverter losses. The safe planning figure for a humidifier-free night.
Heated humidifier on
Often 500 to 600Wh or more
The single biggest drain. A heated tank can add as much as the blower again, sometimes more on a high setting.
Plus heated tubing
Adds even more on cold nights
A second resistive heater. Run both and one night can approach what the bare machine uses in two.
Inverter loss vs DC
Roughly 10 to 15% on AC
Feeding a DC-capable machine from the 12V output skips the inverter and recovers some of that, extending runtime.
Multiply your nightly figure by the nights you will be away, then add headroom for cold weather and inverter loss. That target in watt-hours is the number you buy to.
Photo: An Chu / PexelsCapacity tiers
Capacity tiers: what each watt-hour bracket actually covers
Three brackets cover almost everyone. Match your nightly draw and nights away to a tier first, then pick the unit inside it that fits your weight and budget.
About 300Wh
One humidifier-free night
Enough for a single night with the humidifier off, and the lightest, cheapest way in. Right for a weekend warrior who can charge by day, a backpacker counting every pound, or anyone who already sleeps without humidification. Turn the humidifier on and this tier runs out before morning, so treat it as a one-night, no-heat battery.
Fits: Single nights, humidifier off, lowest weight and cost
About 500Wh
One comfortable night, or two frugal ones
A comfortable single humidifier-free night with real headroom, or two careful nights if you keep the heat off and watch your draw. The mid bracket suits car campers and road-trippers who want margin without lugging a heavy unit. It is still tight for a heated humidifier, which can eat most of it in one night.
Fits: One easy night or two frugal nights, humidifier off
About 1000Wh and up
Humidifier on, multiple nights, or home backup
The bracket that runs a heated humidifier through the night, covers several humidifier-free nights between charges, and doubles as household backup when you are home. It is the answer for anyone who will not give up their humidity, van-lifers, and multi-day off-grid trips, especially paired with a solar panel. The trade is weight and price.
Fits: Humidifier on, multi-night trips, or double-duty home backup
Compare
Comparing 5 portable power stations for CPAP camping
Every pick will run a humidifier-free CPAP for at least one night. They differ on capacity, weight, chemistry and how fast they refill. Scan the table, then read the decision cards below.
Prices move constantly, so we use tiers, not figures. Capacity and weight are approximate.
The pick for most
If you only buy one: Anker SOLIX C1000
Best for most
Anker SOLIX C1000
The unit to buy if you are only buying one: enough watt-hours for a humidified night or several frugal ones, fast LiFePO4, and a genuine second life as home backup.
Capacity: ~1056WhWeight: ~28 lbLiFePO4Recharge: Very fast (about 1 hour)Price: Step-up
Best for: Most CPAP campers, humidifier users, anyone wanting home backup too
If you want one decision instead of five, this is it. At roughly 1056Wh it sits right at the entry to the bracket that actually solves the CPAP-camping problem: it will carry a heated humidifier through a full night, or stretch across several nights with the humidifier off, which is exactly where the smaller units run dry. The chemistry is LiFePO4, so it is built for hundreds upon hundreds of cycles and is the safer, longer-living choice for something you sleep next to. Output is pure sine wave, which keeps the fussiest machines happy, and it recharges from empty in roughly an hour at the wall, so a quick stop tops it up. The reason it tops the list is that it does not retire when the trip ends: brought home, it is a capable backup for a CPAP, a fridge or a router during an outage, which makes the spend far easier to justify than a single-purpose battery. The honest catch is weight. At about 28 lb it is something you carry from the car to the tent once, not something you hike with.
Strengths
About 1056Wh runs a heated humidifier overnight or several humidifier-free nights
Durable LiFePO4 cells and pure sine output, recharges roughly fully in about an hour
Doubles as household backup when you are not camping, so it earns its keep at home
Watch-out
Heavy at around 28 lb, this is car-and-cabin gear, not a backpacking battery
Each of these beats the recommended pick for one specific reader: lighter to carry, cheaper to buy, or with more room to grow. Match the one to your own trip.
Best for long trips
EcoFlow Delta 2
The one that grows with you: roughly 1024Wh on its own, expandable with extra batteries for genuinely long off-grid stretches with everything running.
Capacity: ~1024WhWeight: ~27 lbLiFePO4Recharge: Very fast (about 80 minutes)Price: Premium
Best for: Van-lifers, multi-day off-grid trips, humidifier-and-heated-tubing users
Where the Anker is the sensible single buy, the Delta 2 is the one to choose when you know your trips are getting longer or your loads heavier. The base unit is about 1024Wh, enough to run a humidified machine for a night and change, but the real point is expandability: it accepts bolt-on batteries that stack its capacity well beyond the base, so a long van trip or a week off-grid becomes a question of how many packs you bring rather than whether you will make it. It uses LiFePO4 cells, recharges from the wall in well under two hours, and takes a healthy solar input, which matters because on multi-day trips you want to be refilling by day, not just draining by night. For someone running both a heated humidifier and heated tubing, the kind of setup that punishes a smaller battery, this is the unit with the most room to absorb that draw. The cost climbs once you add expansion, and like the Anker it is heavy, so it suits a fixed basecamp or a vehicle rather than anything you carry far.
Strengths
About 1024Wh base, and accepts add-on batteries to multiply capacity for long trips
Comfortably runs a humidifier plus heated tubing across multiple nights
LiFePO4 chemistry, very fast wall recharge and strong solar input for daytime top-ups
Watch-out
Premium price once you add expansion batteries, and still around 27 lb on its own
Best for: Car campers wanting one easy humidifier-free night with real headroom
The Explorer 500 is the answer to a specific, common need: one comfortable night without a humidifier, with enough margin that you are not nursing the last few percent at dawn. At roughly 518Wh it clears the bare blower with plenty to spare even at a higher pressure, and it can stretch to a second frugal night if you keep the heat off and your draw low. At about 13 lb it lands in a useful sweet spot, heavier than the pocket-sized 300Wh units but a fraction of the 1000Wh class, so one person can carry it and the camp gear in the same trip. The honest caveats keep it in the middle of the pack rather than at the top. It uses older lithium-ion (NMC) cells rather than LiFePO4, so it will not match the lifespan of the newer units, and its wall recharge is slow by current standards. It is also still too small for a heated humidifier, which will drain it inside a night. As a clean, dependable single-night battery for a humidifier-free camper, though, it does exactly what it says.
Strengths
About 518Wh gives a relaxed humidifier-free night with headroom for a high pressure
At around 13 lb it is far easier to move than the 1000Wh units
Proven, simple and pure sine, a no-drama single-night battery
Watch-out
Older Li-ion chemistry and slower recharge, and too small for a heated humidifier
The smart cheap pick: LiFePO4 longevity and a startlingly fast recharge in a one-night, humidifier-free package.
Capacity: ~268WhWeight: ~10 lbLiFePO4Recharge: Very fast (about 30 minutes to 80%)Price: Budget
Best for: Budget buyers who still want LiFePO4 and a fast refill for one humidifier-free night
The EB3A is the budget pick that does not feel like a compromise on the thing that matters most: chemistry. Where cheap power stations usually mean older lithium-ion, this one uses LiFePO4, so you get the longer cycle life and the steadier safety profile of the pricier units at the bottom of the price ladder. Capacity is about 268Wh, which is firmly one humidifier-free night with little to spare, so it is best for a low-pressure machine, a careful sleeper, or a weekend where you can recharge by day. Its party trick is speed: plugged into the wall it can reach roughly 80% in around half an hour, which turns a short stop at a cafe or a campground hookup into a meaningful top-up. It is compact and has earned a big following as a first off-grid battery. Just respect the size. Switch on a heated humidifier and it will not see morning, so this is a no-heat, single-night tool, chosen for value and longevity rather than runway.
Strengths
LiFePO4 chemistry at a budget price, unusual and welcome in this bracket
Refills remarkably fast, roughly 80% in around half an hour at the wall
Compact and popular, an easy first off-grid CPAP battery
Watch-out
At about 268Wh it is a strict one-night, humidifier-off battery with little margin
The featherweight: about 288Wh at roughly 8 lb, the easiest unit to actually carry for a single humidifier-free night.
Capacity: ~288WhWeight: ~8 lbLiFePO4Recharge: Fast (USB-C PD, wall or solar)Price: Budget
Best for: Weight-counters and minimalists wanting the lightest one-night, humidifier-free battery
If weight is your deciding factor, this is the unit. At roughly 8 lb it is the only one here you would seriously consider carrying any distance from the car, which makes it the natural choice for a hike-in tent site, a kayak trip or anyone who simply does not want to wrestle a 28 lb block. Capacity is about 288Wh, so the job description is the same as the EB3A: one humidifier-free night for a typical machine, with the humidifier firmly off. It charges quickly over USB-C, which means a power bank, a laptop charger or a car can help refill it, and it accepts a solar panel for hands-off daytime topping up on longer trips. As with every small unit, the discipline is the same. Keep the humidity and heated tubing switched off, plan to recharge during the day, and it will quietly cover your night. Ask it to do more than that and it is simply the wrong size, which is what the larger picks are for.
Strengths
Lightest here at around 8 lb, the one you will actually pack for a hike-in camp
About 288Wh covers a single humidifier-free night for a typical machine
Recharges fast over USB-C and takes solar for daytime top-ups
Watch-out
Small capacity, so a heated humidifier or a second night is out of reach
Capacity decides whether you make it through the night. These five factors decide how well the unit fits the rest of your life off-grid.
Battery chemistry: prefer LiFePO4
LiFePO4 cells last far longer, typically many times the cycle life of older lithium-ion, and run cooler and steadier, which matters for a battery you sleep beside night after night. Most newer units use it. An older lithium-ion unit can still be a fine occasional-use battery, but for regular trips the longevity of LiFePO4 is worth paying for.
Pure sine wave output
Some CPAPs, especially those with sensitive electronics, want a clean pure sine wave from the inverter and can behave oddly on a cheaper modified sine output. The units here are pure sine, which is the safe default. If you are ever unsure whether your machine is happy on a given output, check its manual or ask your provider.
Recharge speed
On a trip you are refilling the battery by day to cover the next night, so how fast it charges is as practical as how much it holds. Fast wall charging turns a short stop into a real top-up, and strong USB-C input lets smaller units sip from a car or laptop charger. Slow recharging ties you to long stints at a hookup.
Solar input for multi-day trips
For anything past a couple of nights, solar changes the math. A panel that refills the battery during the day means your capacity resets before each night instead of ticking down to zero. Check the unit's maximum solar input and pair it with a panel sized to your trip and your local sun, not the best-case lab figure.
Weight and portability
The 300Wh units are around 8 to 10 lb and genuinely portable. The 1000Wh units are roughly 27 to 28 lb, which is a two-hands, car-to-site carry. Be honest about how far the battery has to travel from the vehicle. The lightest unit you can live with is the one you will actually bring.
DC output vs AC
Running your CPAP from the wall-style AC socket goes through the inverter and loses roughly 10 to 15%. If your machine supports a DC input, feeding it from the unit's 12V output skips that loss and stretches runtime. Not every machine offers a DC option, so check yours, but where it exists it is the more efficient way to run off-grid.
Do not buy if
When NOT to buy these (and what to do instead)
Honest sizing means knowing the failure cases. Buy the wrong unit for these situations and you will be cold, flat or stuck.
!Do not buy a 300Wh unit if you run a heated humidifier
A heated humidifier can push a night past 500 to 600Wh, so a 268 to 288Wh battery will quit before morning. If you will not give up humidity, skip the small tier entirely and start at the 1000Wh class, or commit to running the humidifier off when you camp.
!For flights, buy a CPAP-specific battery, not this
These are camping and road-trip batteries. For air travel you want a purpose-built CPAP battery that meets airline watt-hour limits and is sized to carry on. Large power stations are heavy, awkward and run into watt-hour restrictions. This page is for the ground, not the cabin.
!Do not assume any cheap inverter is fine for your machine
A modified sine wave output can upset some CPAPs. The units here are pure sine, which is the safe choice. If you are pulling an unknown or very cheap power station into service, confirm it is pure sine and that your machine is happy on it before you rely on it for a night.
!Do not buy more battery than you will carry
A 28 lb unit hauled to a backpacking site is the wrong tool, and you will leave it at home. If you hike in, size down to the lightest battery that covers a humidifier-free night and plan to recharge by day. Match the weight to how the battery actually travels.
!Do not lean on solar without enough panel or sun
Solar is a multi-day game-changer, but only with a panel sized to your draw and decent daylight. Cloud, shade and short winter days can leave you short. Size the battery to cover at least one full night on its own, and treat solar as the thing that refills it, not the thing that powers the night.
Real-world runtime
Real-world runtime: what campers actually get
Spec-sheet math is conservative on purpose. Real draw depends on your pressure, your humidity setting, whether you run on DC, and the temperature. These ranges reflect what people commonly report, not guarantees.
A ~300Wh unit, humidifier off
Often 2 to 3 nights for a low-pressure machine
Because a humidifier-free machine on a modest pressure can draw well under the 300Wh planning figure, sometimes only 100 to 150Wh a night, campers regularly stretch a small unit across two or three nights on a single charge, with the reserve dropping each morning. Higher pressures and colder nights pull that back toward one night.
A ~300Wh unit, humidifier on
Usually not even one full night
Switch the heated humidifier on and the same little battery struggles to reach morning. This is the single clearest reason the small tier is a no-heat, single-night tool. If you want humidity, this is not the unit.
A ~1000Wh unit, humidifier on
Roughly 1.5 to 2 humidified nights
At the 1000Wh class a heated humidifier becomes practical, with a comfortable single night and enough left for part of a second. Turn the humidifier off and the same unit covers several nights, which is why this bracket is the safe choice for anyone unwilling to give up humidity.
A ~1000Wh unit plus a solar panel
Effectively open-ended in good sun
Pair a 1000Wh unit with a capable solar panel and a sunny site and the trip length stops being about the battery. The panel refills it by day faster than the CPAP drains it by night, so a multi-day or van trip becomes sustainable rather than a countdown.
Want certainty for your own setup? Run one night at home on the power station and read the percentage used off its display. That single test beats any estimate on this page.
Field tips
Field tips: stretch every watt-hour off-grid
Capacity gets you to the campsite. These habits get you through the trip, and can roughly double how long a given battery lasts.
Turn the heated humidifier and heated tubing off. This is the single biggest lever by a wide margin, often the difference between one night and three. A simple in-line humidifier or a damp climate can make the heat unnecessary.
Use the DC or car output if your machine supports it. Running on 12V skips the inverter and its 10 to 15% loss, quietly adding runtime for free.
Recharge by day. Top the battery up from solar, the car or a campground hookup while the sun is out, so it is full again before each night rather than counting down across the trip.
Keep the unit from getting cold. Lithium batteries lose usable capacity in the cold, so insulate the power station, keep it inside the tent or vehicle, and do not leave it out in a freezing night.
Pre-charge to 100% before you leave, and top up at any opportunity on the way. Starting full is the cheapest extra night you will ever get.
Measure your own draw once. Run a normal night on the unit at home and note the watt-hours or percentage used. Now you know your real number and can size and plan with confidence.
Questions
CPAP camping power FAQ
How big a power station do I need to run a CPAP while camping?
Start from watt-hours per night. With the humidifier off, plan about 300Wh a night, so a single night needs roughly a 300Wh unit and a comfortable night with margin wants around 500Wh. Run a heated humidifier and a night can pass 500 to 600Wh, which pushes you to the 1000Wh class. Multiply your nightly figure by the nights you will be away, add headroom for cold and inverter losses, and buy to that number.
Can a portable power station run a CPAP with a heated humidifier?
Yes, but only a big enough one. A heated humidifier is a small electric heater and is the largest drain in the system, often adding as much as the blower again or more. That puts a humidified night above 500 to 600Wh, so you want a unit in the 1000Wh class such as the Anker SOLIX C1000 or EcoFlow Delta 2. A 300Wh battery will not survive a humidified night.
How many nights will a power station run my CPAP?
It depends on your draw. Humidifier off and on a modest pressure, a 300Wh unit often covers two to three nights for a low-draw machine, while a 1000Wh unit can run several. Switch the humidifier on and a 1000Wh unit gives roughly one and a half to two nights, and a 300Wh unit may not finish one. Cold weather and higher pressures shorten all of these. A solar panel that refills by day can make a trip effectively open-ended.
Is LiFePO4 better than lithium-ion for a CPAP power station?
For regular use, yes. LiFePO4 cells last far longer, commonly several times the cycle life of older lithium-ion, and run cooler and more stably, which is reassuring for a battery you sleep next to. Most newer units, including the Bluetti EB3A, Anker C1000 and EcoFlow Delta 2 here, use LiFePO4. An older lithium-ion unit like the Jackery Explorer 500 can still serve fine for occasional trips, but the chemistry will not last as long.
Do I need a pure sine wave power station for my CPAP?
It is the safe choice. Some CPAPs, especially those with more sensitive electronics, prefer a clean pure sine wave from the inverter and can behave unpredictably on a cheaper modified sine output. Every unit recommended here is pure sine. If you are unsure whether your machine is happy on a particular power station, check your machine's manual or ask your CPAP provider.
Should I run my CPAP on DC or AC off-grid?
DC is more efficient where your machine supports it. Running from the wall-style AC socket goes through the inverter and loses roughly 10 to 15%. Feeding a DC-capable machine from the power station's 12V output skips the inverter and stretches runtime. Not every CPAP offers a DC input, and some need a specific cable or converter, so check yours. Where the option exists, it is the better way to run off-grid.
Can I recharge the power station with solar while camping?
Yes, and for trips past a couple of nights it is the key to not running out. A solar panel refills the battery during the day so its capacity resets before each night. Check the unit's maximum solar input and pair it with a panel sized to your trip and your local sun. Plan for the battery to cover a full night on its own, with solar as the thing that tops it back up.
Is a portable power station good for flying with a CPAP?
No, and that is not what this page is about. These are camping and road-trip batteries, heavy and large, and the big ones run into airline watt-hour limits. For air travel you want a purpose-built CPAP battery sized to meet carry-on watt-hour rules. Use a power station for the ground, for camping, road trips and off-grid stays, and a dedicated CPAP battery for the cabin.
Will turning off the humidifier really save that much power?
Yes, by a wide margin. The heated humidifier and heated tubing are the hungriest parts of the setup, and switching them off can roughly halve or better your nightly draw, often turning one night of runtime into two or three. If you can sleep comfortably without humidity, or use a passive in-line humidifier, it is the single most effective way to stretch any battery you buy.
Is it safe to run a CPAP off a power station all night?
Powering the device from a quality pure sine wave power station is a common, well-established way to camp with a CPAP. That said, this page covers powering the machine, not your therapy. For anything about whether your specific machine should run on battery, your pressure, mask or humidity settings, or any medical question, speak to your CPAP provider or doctor. Treat the figures here as planning numbers for sizing a battery, not clinical advice.
Affiliate disclosure. This guide is reader supported. When you buy through links on this page we may earn a commission, at no extra cost to you. Picks are chosen on capacity, chemistry and value, not commission. As an Amazon Associate I earn from qualifying purchases.
Not medical advice. This page covers powering a CPAP off-grid only. For any question about your therapy, pressures, mask, humidity settings or whether your machine should run on battery, consult your CPAP provider or doctor. For air travel, use a CPAP-specific battery rather than a power station.
