The short version: plug your CPAP's existing power brick directly into a power station's AC outlet — no special adapter needed — and even an entry-level 300–500Wh unit will run it for several nights per charge. For the roughly 8 million Americans who use a CPAP machine nightly, a power outage isn't just an inconvenience — it can mean a night without sleep apnea treatment, which carries real health risks for people with moderate to severe apnea. The good news: CPAP machines are one of the easiest medical devices to keep running on battery power, because they draw relatively little energy compared to most home appliances.
How Much Power Does a CPAP Actually Need?
Most CPAP machines draw between 30–60W without a humidifier running, and up to 80–100W with the heated humidifier active. This is very low compared to appliances like a fridge (60–400W) or space heater (750–1,500W) — which is why even a small power station can comfortably run a CPAP for multiple nights.
How Long Will a Power Station Run My CPAP?
| Power Station Capacity | CPAP Only (no humidifier, ~40W) | CPAP + Humidifier (~80W) |
|---|---|---|
| 245Wh (e.g. EcoFlow River 3) | ~5–6 nights | ~2–3 nights |
| 500Wh | ~10–12 nights | ~5–6 nights |
| 1,000Wh (e.g. Jackery Explorer 1000 v2) | ~20–25 nights | ~10–12 nights |
These estimates assume roughly 8 hours of nightly use and account for typical inverter efficiency losses. Plug your own CPAP's wattage and power station capacity into our runtime calculator for an exact number, or see our wattage sizing guide for a full breakdown of the math.
Step-by-Step: Setting Up CPAP Backup Power
- Check your CPAP's power draw. Look at the label on the power brick (usually printed as "Output: XXW" or "XX.XV, X.XA") or your machine's user manual.
- Confirm your power station has a pure sine wave inverter. Nearly all modern power stations do, but this matters specifically for CPAP machines, since a modified sine wave can cause some CPAP motors to run hotter or louder.
- Plug the CPAP's existing power brick directly into the power station's AC outlet. No special adapter is needed for most machines — you use the exact same power supply you already use at home.
- Turn off the heated humidifier if you need to stretch runtime. This alone can roughly double how many nights you get from a single charge.
- Keep the power station charged and ready, not stored empty. Recharge it after every use, the same way you'd treat a phone.
Which Power Station Size Should CPAP Users Buy?
For CPAP-only backup (not powering anything else), a 300–500Wh unit is usually enough for several nights per charge and stays compact and affordable. If you also want to cover a fridge or other essentials during a longer outage, size up to 1,000Wh+ — see our top-ranked power stations for options across every budget, or our dedicated best power stations for CPAP machines comparison for CPAP-specific picks.
Traveling With Your CPAP? A Power Station Isn't the Right Backup
A full-size power station is the right tool for home outages, but not for air travel: most exceed the FAA's 160Wh carry-on limit and can't fly at all. See our flying with a power station guide for the exact rules — for travel specifically, a dedicated CPAP battery (see below) or your machine's DC car adapter are the practical options instead.
Frequently Asked Questions
Can I run a CPAP with a DC battery adapter instead of AC?
Some CPAP models offer an optional DC adapter cable that skips the AC inverter entirely, slightly improving power efficiency. This is a nice-to-have but not necessary — running through the standard AC power brick works fine on any pure sine wave power station.
Will my travel CPAP battery be enough instead of a power station?
Dedicated CPAP travel batteries typically hold only 1–3 nights of charge and can't power anything else. A general-purpose power station costs slightly more but gives you multi-night CPAP backup plus the ability to run lights, charge phones, or power a mini fridge during the same outage.
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