Bottom line: A CPAP without its heated humidifier draws only 30–60W — a small 300–500Wh portable power station runs it for 1–3 nights. Turn off the heated humidifier and heated tube (this triples your runtime), use a 12V DC converter instead of AC power when possible, and size for at least two nights so one cloudy day doesn’t leave you stranded.
For the roughly 8% of American adults using a CPAP, a hurricane power outage isn’t just inconvenient — it’s a health issue. Here’s how to keep breathing easy when the grid goes down.
How Much Power Does a CPAP Use?
This is the good news: CPAPs are light loads.
| CPAP Setup | Typical Draw | 500Wh Station Runtime* |
|---|---|---|
| CPAP only, no humidifier, no heated tube | 30–40W | ~12–14 hours |
| CPAP + humidifier (no heated tube) | 60–90W | ~5–7 hours |
| CPAP + heated humidifier + heated tube | 90–120W | ~3.5–4.5 hours |
*Assuming ~85% efficiency through the AC inverter. DC power (below) stretches this further.
The heated humidifier is the power hog — it can triple consumption. During an outage, turn it off (or set humidity to the lowest passive setting). You’ll wake up with a drier mouth; you’ll also wake up with battery to spare. That’s the trade.
The 12V DC Trick (Do This)
Most CPAPs can run directly from 12V DC with a manufacturer DC converter cable (~$80–100 for ResMed, Philips, etc.). Why bother? Running on AC means your power station converts battery DC → AC, then your CPAP’s power brick converts AC → DC again. Each conversion wastes ~10–15%.
Running DC-to-DC skips the round trip and typically adds 20–30% more runtime from the same battery. For multi-night outages, that’s the difference between two nights and three.
Buy the DC converter for your specific CPAP model before storm season — they’re model-specific (ResMed AirSense 10/11, Philips DreamStation, etc.) and sell out when hurricanes approach.
What Size Battery Do You Need?
Minimum — one night: A 250–300Wh power station (~$200–$250) covers a single 8-hour night with the humidifier off. Tight, but workable for brief outages.
Sweet spot — 2–3 nights: A 500Wh-class station (~$300–$450) gives you 2+ nights with margin. This is what most CPAP users should buy. It’s also enough to keep phones charged on the side.
Whole-house outage kit: A 1,000Wh station (~$500–$800) runs the CPAP for 4–5 nights and covers the fridge, phones, and a fan. If you’re buying one power station for the household anyway, the CPAP rides along for free.
[AFFILIATE LINK: EcoFlow River 2 Pro] [AFFILIATE LINK: Jackery Explorer 500]
Dedicated CPAP batteries (Medistrom Pilot-24 Lite, ~$300) are smaller and lighter — great for travel — but a general-purpose power station is more versatile for home outages since it also runs everything else.
Recharging During a Multi-Day Outage
- Car: A 12V car charger refills a 500Wh station in ~4–5 hours of driving/idling. Not fast, but it works.
- Solar: A 100–200W portable panel refills a 500Wh station in a day of decent sun. Slow, but silent and fuel-free.
- Gas generator: If you have one, recharge the power station during the day while the generator runs other loads — then sleep on silent battery power at night. (Generator stays outdoors, 20+ feet from the house — never indoors or in the garage.)
What NOT to Do
- Don’t run a gas generator indoors to power your CPAP — not in the garage, not “just for a minute.” Carbon monoxide is odorless and kills in minutes. The generator lives outside; run an extension cord in.
- Don’t use a cheap modified-sine-wave inverter from a gas station. CPAPs are medical devices with sensitive electronics — use pure sine wave power only (all the power stations we recommend are pure sine wave).
- Don’t forget to test. Run your CPAP off the battery for a full night before storm season. Discovering a dead battery or wrong cable at 2 AM during a hurricane is the failure mode you’re preparing against.
Our Recommended Setup for Florida CPAP Users
- 500Wh LFP power station (EcoFlow River 2 Pro, Jackery Explorer 500, or similar) — 2+ nights per charge, useful for the whole household.
- 12V DC converter cable for your exact CPAP model — buy now, not when the storm is coming.
- Humidifier OFF during outages — the single biggest runtime lever you have.
- A recharge plan — car charger cable at minimum; a 100W+ solar panel if you want multi-day independence.
Total cost: roughly $400–$550 for a setup that also backs up your phones, a fan, and a lamp. For something you depend on to breathe safely through the night, that’s cheap insurance.
Frequently Asked Questions
Will my CPAP work with any portable power station?
Yes, as long as the station’s AC output covers your CPAP’s draw (any 300W+ station does) and it’s pure sine wave (virtually all modern stations are). For maximum runtime, use the DC converter.
How many nights will a Jackery 1000 v2 or EcoFlow Delta 2 run my CPAP?
With the humidifier off (~40W draw): roughly 20+ hours each — about 2.5 nights. With heated humidifier on (~100W): roughly 8–9 hours — one night. See our full comparison.
Can I use my CPAP in the car during an outage?
Yes, with the DC converter plugged into the 12V outlet — but don’t idle the car in a closed garage (carbon monoxide again). Crack the garage door fully or park outside.
Does Medicare/insurance cover a backup battery?
Generally no — backup power is considered a convenience, not a medical necessity, by most insurers. Some durable medical equipment suppliers sell battery packs; check with yours, but expect to pay out of pocket.
What about oxygen concentrators?
Stationary oxygen concentrators draw 300–600W — far more than a CPAP. They need a large power station (2kWh+) or a generator, and this is a “talk to your doctor and equipment supplier now” situation, not a buy-a-battery situation. Portable oxygen concentrators with their own batteries are a separate category — keep them charged and have a car-charging plan.