Quick answer
Yes, a power station runs a CPAP machine easily, and it is one of the jobs these batteries do best. With its heated humidifier and heated hose switched off, a typical CPAP draws only about 30 to 60W, so an eight-hour night uses roughly 250 to 500Wh. That means a small 300Wh unit covers about one night, a 1,000Wh unit two to three nights (or one night with humidification), and a 2,000Wh unit sees out a long trip. The humidifier and heated tube are the power hogs and can multiply the draw several times over, so turning them off, or running a cooler setting, dramatically extends runtime. Use a pure sine wave AC output, and check your machine's manual for a DC input, which skips the inverter and is more efficient again.
Can a power station run a CPAP machine?
Yes, a power station runs a CPAP machine easily, and quietly enough to sleep beside. It is one of the loads a portable battery handles best, because a CPAP without heated extras draws very little power.
With its heated humidifier and heated hose switched off, a typical CPAP pulls only about 30 to 60W. Over an eight-hour night that is roughly 250 to 500Wh of energy. Put that next to a kettle or a fan heater, which pull thousands of watts, and you can see why a CPAP is an undemanding overnight companion for the right battery.
The catch is not the machine itself. It is the two heated accessories bolted onto it.
What actually uses the power: the humidifier and heated hose
The blower motor that pushes air is efficient. The heated humidifier and heated tube are the power hogs, and they can multiply the total draw several times over, because heating water and heating air both take real energy.
Switch them off and a CPAP sips power all night. Run them on a high setting and the same machine can pull three to four times as much, turning a two-night battery into a one-night one.
For exact numbers, check your CPAP's own manual or the label on its power supply. It lists the wattage, and it will tell you whether the machine has a DC input, which matters for efficiency (more on that below).
How many nights will each size run a CPAP?
The table below gives rough estimates for a full night's use, not lab tests. It assumes an eight-hour night and that a power station delivers around 85% of its rated capacity to your device, because the inverter and battery lose the rest as heat.
Your own machine may sit higher or lower than these figures, so treat them as a guide and check your CPAP's rated watts.
| CPAP setup | Typical draw | Energy per 8-hour night | ~300Wh unit (~245Wh usable) | ~1,000Wh unit (~870Wh usable) | ~2,000Wh unit (~1,740Wh usable) |
|---|---|---|---|---|---|
| Humidifier and heated hose OFF | ~30 to 60W | ~250 to 500Wh | About 1 night | 2 to 3 nights | 4 to 6 nights |
| Humidifier or heated hose ON | ~90 to 150W | ~700 to 1,200Wh | Not a full night | About 1 night | About 2 nights |
Two things follow from that table. First, if you camp with humidification on, a 300Wh unit will not see you through the night, and you want a 1,000Wh battery as your realistic minimum. Second, humidifier off is where the small units shine: a pocketable 300Wh station genuinely covers a night, and a 1,000Wh one covers a long weekend without a recharge.
Use a pure sine wave output, and check for a DC input
Two technical points decide whether the pairing runs cleanly.
Use a pure sine wave AC output. CPAP machines have sensitive electronics and are happiest on the same clean mains-quality power they get from a wall socket. Every model featured on Coast & Fell uses a pure sine wave inverter, so this is a non-issue with the units here, but it is worth knowing if you are looking at a cheap unbranded battery elsewhere.
Check your CPAP's manual for a DC input. Many CPAPs can be run from a 12V DC supply directly, using an optional DC cable or converter. Feeding the machine over DC skips the AC inverter step, which wastes a slice of energy converting the battery's DC to 230V AC and back again inside the machine's own adapter. Running on DC is more efficient and squeezes extra runtime out of the same battery. Whether your machine supports it, and which cable it needs, is in its manual, so check there before buying accessories.
Which power station for a CPAP?
For most CPAP users the choice comes down to how many nights you need and whether you run humidification.
For a night or two away, humidifier off, a compact 300Wh unit is enough and light enough to carry. The EcoFlow River 3 Plus holds 286Wh, weighs 4.7kg and has a 600W pure sine wave output, which comfortably covers a CPAP's modest draw for a night. It slips into a rucksack rather than filling the boot.
Buy the EcoFlow River 3 Plus on Amazon Or buy direct at EcoFlowFor longer trips, or nights with the humidifier on, step up to around 1,000Wh. The Anker SOLIX C1000 Gen 2 holds 1,024Wh and runs a humidifier-off CPAP for two to three nights, or a humidified one for about a night, with a 2,000W output that leaves plenty of headroom for phones, a light and other kit alongside. At 11.3kg it is a carry-to-the-pitch unit rather than a rucksack one, but it is the sensible size if you want margin.
Buy the Anker SOLIX C1000 Gen 2 on AmazonIf your CPAP runs humidification every night and you want several nights off-grid, or you want the same battery to double as home backup during a power cut, size up again to 2,000Wh. The full buying guide ranks every current UK model against the same fact base.
FAQ
How much power does a CPAP machine use?
Will a power station run a CPAP all night?
Do I need a pure sine wave power station for a CPAP?
Is it more efficient to run a CPAP on DC instead of AC?
Can a power station run a CPAP during a power cut?
Where to next
Worked out the size you need? The complete portable power station buying guide ranks every current UK model against the same fact base, and the what size power station do I need guide walks through the sizing sum for the rest of your kit.