Running a CPAP machine away from shore power is one of the most specific portable power challenges there is — because getting it wrong doesn't just mean a dead phone, it means a bad night's sleep or a gap in treatment.
This guide is written specifically for CPAP users. We cover how much power your machine actually draws, which stations give the best runtime per dollar, and the DC vs. AC powering question that most reviews skip entirely.
Our top pick
- ✓LiFePO4 battery rated for 3,000+ full charge cycles
- ✓Charges 0–80% in under 50 minutes via AC
- ✓Up to 500W solar input — pair with 2×160W panels
- ✓X-Boost powers up to 2,400W devices
How much power does your CPAP actually use?
CPAP power draw varies more than most guides acknowledge. Your machine's pressure setting and whether you use a humidifier are the two biggest variables.
| Machine | No Humidifier | With Humidifier |
|---|---|---|
| ResMed AirSense 10 | 15–30W | 40–80W |
| ResMed AirSense 11 | 15–35W | 45–85W |
| Philips DreamStation 2 | 20–40W | 50–90W |
| ResMed AirMini (travel) | 8–20W | N/A |
Turning off the humidifier roughly doubles your runtime from any given station. Many CPAP users tolerate skipping it for short trips, especially in humid climates.
Calculating your runtime
Use this formula for any station:
Via AC outlet: (Station Wh × 0.85) ÷ Machine Wattage = Hours
Via DC cable: Station Wh ÷ Machine Wattage = Hours
The 0.85 factor accounts for inverter losses when using AC. A DC cable — if your station supports 12V output and your machine has a compatible cable — skips the inverter entirely, giving you 15–20% more runtime.
Example — ResMed AirSense 10 at 25W, no humidifier, 500Wh station:
- Via AC: (500 × 0.85) ÷ 25 = 17 hours (~2 nights)
- Via DC: 500 ÷ 25 = 20 hours (~2.5 nights)
Even a 300Wh station gives you multiple nights without a humidifier.
Turn off the humidifier for travel
Skipping the humidifier for a few nights can double your runtime and lets you use a much smaller, lighter station. Most users tolerate it fine for short trips — especially in already-humid environments like coastal or summer camping.
Quick comparison
| Product | Price | Capacity | Weight | Battery | Airline OK | Best For | Buy |
|---|---|---|---|---|---|---|---|
EcoFlow DELTA 2Best Overall | ~$599 | 1,024Wh | 27 lbs | LiFePO4 | — | Best all-around pick | Buy → |
Jackery Explorer 500Most Popular | ~$349 | 518Wh | 13.3 lbs | NMC | Check airline | The most popular power station among CPAP travelers | Buy → |
Bluetti AC50SBest Mid-Range | ~$299 | 500Wh | 16.5 lbs | NMC | — | 500Wh hits the sweet spot for CPAP travelers who want 3–4 nights of coverage in a lighter package. | Buy → |
Jackery Explorer 300 PlusMost Portable | ~$279 | 288Wh | 7.3 lbs | LiFePO4 | Yes | The lightest viable option for CPAP users who prioritize portability over multi-night capacity. | Buy → |
ResMed Power Station IIPurpose-Built | ~$249 | ~97Wh | 1.9 lbs | — | Yes | The only option made specifically for CPAP | Buy → |
The reviews
1. EcoFlow DELTA 2 — Best Overall for CPAP
- ✓LiFePO4 battery rated for 3,000+ full charge cycles
- ✓Charges 0–80% in under 50 minutes via AC
- ✓Up to 500W solar input — pair with 2×160W panels
- ✓X-Boost powers up to 2,400W devices
- ✓Expandable to 2,048Wh with add-on battery
- ✗27 lbs — heavier than some alternatives
- ✗Higher upfront cost than NMC competitors
1,024Wh is more than enough for most CPAP travelers. At typical CPAP draw (25W, no humidifier), you're getting 35+ hours via DC connection — enough for a full week-plus of nightly use. With a humidifier at medium settings, plan on 2–3 nights.
The LiFePO4 chemistry is important here. This is a device you'll use hundreds of nights over the years. An NMC battery that degrades to 70% capacity after 2 years of heavy use is a problem; LiFePO4 rated for 3,000 cycles holds up for a decade.
Use a 12V DC cable for your specific machine model (ResMed sells these, as do third-party accessory makers) and bypass the inverter entirely for maximum runtime.
2. Jackery Explorer 500 — Most Popular Choice
- ✓518Wh — solid 3–4 nights without humidifier
- ✓One of the most trusted brands among CPAP users
- ✓13.32 lbs — genuinely portable
- ✓Compatible with Jackery SolarSaga panels
- ✗NMC battery (not LiFePO4)
- ✗AC recharge takes about 7.5 hours
- ✗1 AC outlet only
The Explorer 500 is the most commonly recommended power station in CPAP user forums, and for good reason. 518Wh at 13.3 lbs is a practical size — substantial enough for a week of light use or a 3–4 night trip with humidifier, light enough to pack without second thoughts.
Jackery's customer support reputation is strong, which matters when you're depending on something for nightly medical use. The main limitation is NMC battery chemistry — fine for users who travel a few times a year, but not ideal for daily or weekly use over many years.
3. Bluetti AC50S — Best Mid-Range Value
- ✓500Wh covers 3–4 nights without humidifier
- ✓Lighter than larger stations at 16.5 lbs
- ✓Multiple output ports including DC barrel
- ✓Solid value for occasional travelers
- ✗NMC battery — shorter cycle life than LiFePO4
- ✗Slower recharge than premium options
The AC50S sits between the Explorer 300 and the larger 800Wh+ options in a useful way — 500Wh for 3–4 nights without a humidifier, in a package that's lighter than the DELTA 2. If you want more than the Explorer 300 Plus but find the DELTA 2 overkill for your trips, this is the right middle ground.
The NMC battery is the trade-off against the Bluetti EB70S, which offers LiFePO4 at a similar capacity.
4. Jackery Explorer 300 Plus — Best for Portability and Air Travel
- ✓Only 7.3 lbs — truly portable
- ✓LiFePO4 battery
- ✓2–3 nights CPAP use without humidifier
- ✓Airline carry-on eligible
- ✗288Wh limits you to 2–3 nights without humidifier
- ✗No DC barrel connector on all models
At 7.3 lbs and under the 100Wh carry-on threshold per cell, the Explorer 300 Plus is the best option if you need something genuinely airline-portable. It won't cover a full week — plan on 2–3 nights without a humidifier — but for a long weekend trip or a work trip where you'll also have some outlet access, it's the right call.
The LiFePO4 battery at this size and price is a genuine standout.
5. ResMed Power Station II — Purpose-Built for ResMed Users
- ✓Under 100Wh — FAA-approved for airline carry-on
- ✓Designed specifically for ResMed AirSense/AirMini
- ✓Very lightweight at under 2 lbs
- ✓Direct DC connection, no inverter needed
- ✗Only works with ResMed machines
- ✗1–2 nights capacity maximum
- ✗Expensive for the capacity
This is the only option on the list made specifically for CPAP machines. If you use a ResMed AirSense or AirMini, it integrates cleanly, is FAA-approved for cabin carry-on, and weighs under 2 lbs. It's not a general-purpose power station — it won't charge your phone or run a fan.
The value case is narrow: it's expensive for the capacity, and only makes sense if airline compliance and minimal weight are your top priorities. For most users, a general-purpose station like the Explorer 300 Plus gives better value at similar weight.
DC vs. AC powering — the detail most guides miss
Most power station reviews for CPAP users just tell you to make sure the station has an AC outlet. That works — but it's leaving runtime on the table.
AC path: Battery → DC inverter → AC outlet → CPAP power brick → CPAP. Two conversions, each losing 10–15% as heat.
DC path: Battery → 12V DC port → DC cable → CPAP. One connection, minimal loss.
For CPAP users, 12V DC cables are available for most ResMed and Philips models. The EcoFlow DELTA 2, Jackery Explorer 500, and Bluetti AC50S all support 12V DC output. It's worth checking your machine's compatible cable before buying — the runtime difference is meaningful over a week-long trip.
Frequently asked questions
Frequently Asked Questions
The bottom line
For most CPAP travelers, the EcoFlow DELTA 2 is the right choice — enough capacity for a full week, LiFePO4 longevity for years of nightly use, and DC output for maximum efficiency.
If portability is the priority, the Jackery Explorer 500 hits the sweet spot of capacity and weight that makes it the most popular choice in the CPAP community.
For air travel, the Jackery Explorer 300 Plus (7.3 lbs, multiple nights) or the ResMed Power Station II (under 2 lbs, airline-approved) are the right choices depending on how many nights of coverage you need.