Best Backup Power for a CPAP Machine in 2026
The EcoFlow River 2 is the best backup power for a CPAP machine in 2026 - runs a CPAP for 2-3 nights, recharges fast. 3 alternatives ranked for outages and travel.
Our picks are based on published specs, verified user reviews, and hands-on experience where noted. We always recommend checking product details and reading reviews relevant to your specific needs before purchasing. How we research · Editorial policy
EcoFlow River 2
The EcoFlow River 2 is the best all-round backup power for a CPAP machine - a 256Wh battery that runs most CPAP machines for 2-3 nights without the heated humidifier, and recharges to full in about an hour. For sleep apnea sufferers, a power cut is not an inconvenience, it is a night without treatment. A power station removes that risk entirely. The Jackery Explorer 240 v2 is the best value, and the Medistrom Pilot-24 Lite is the runner-up if you want a dedicated CPAP battery sized for travel.
At a Glance
| Feature | EcoFlow River 2 | Jackery Explorer 240 v2 | Medistrom Pilot-24 Lite | Anker 521 PowerHouse |
|---|---|---|---|---|
| Price | $239 | $199 | $229 | $249 |
| CPAP Runtime | 2-3 nights (humidifier off) | 2-3 nights (humidifier off) | 1 night (2 with humidifier off) | 2-3 nights (humidifier off) |
| Recharge Speed | ~60 minutes to full | Several hours to full | Wall or car charging | Mid-pack |
| Output Quality | Pure sine wave | Pure sine wave | DC direct to CPAP | Pure sine wave |
| Portability | 3.5kg | 3.6kg | Compact / travel-sized | 3.9kg |
| Longevity | 256Wh | 256Wh | CPAP-battery (single-night class) | 256Wh (LiFePO4) |
Quick Comparison
Our Top Picks
EcoFlow River 2
Best overall - 256Wh, runs a CPAP 2-3 nights without humidification, recharges to full in about an hour.
- 256Wh runs most CPAP machines 2-3 nights (humidifier off)
- Recharges 0-100% in roughly 60 minutes - fastest in class
- Pure sine wave AC output - safe for CPAP motors and electronics
- Light at 3.5kg - genuinely portable for travel and camping
- Pass-through charging: runs the CPAP while itself charging
- Quiet - no fan noise during low-draw overnight use
- With a heated humidifier and heated tube, runtime drops to roughly one night
- AC inverter has a small standby draw - use the DC output if your CPAP supports it
- 256Wh is modest if you also want to power other devices
Jackery Explorer 240 v2
Best value - 256Wh at a lower price, dependable Jackery build, slower to recharge.
- 256Wh - same realistic 2-3 night CPAP runtime as the winner
- Lower price than the EcoFlow River 2
- Pure sine wave AC output
- Jackery has a long, dependable track record
- Simple, readable display showing remaining runtime
- Slower recharge than the EcoFlow (a few hours, not one)
- No pass-through charging on some units - check before relying on it
- Heated humidifier still cuts runtime to roughly one night
Medistrom Pilot-24 Lite
Runner-up - a CPAP-specific battery, compact and travel-sized, designed to plug straight into the machine.
- Purpose-built for CPAP - connects directly to the machine
- Compact and light - sized for a bedside table or travel bag
- Can charge from the wall or in a car
- Often runs one full night, two with the humidifier off
- No AC inverter standby loss - DC straight to the CPAP
- Smaller capacity than a 256Wh power station - usually one night
- CPAP-only - cannot power a phone, light, or fridge
- Compatibility varies by CPAP model - check before buying
Anker 521 PowerHouse
A durable LiFePO4 alternative - longer battery lifespan, slightly heavier, dependable for nightly use.
- LiFePO4 battery chemistry - far more charge cycles than standard lithium
- 256Wh - the same 2-3 night CPAP runtime class
- Pure sine wave output
- Built tough - Anker designed it for rugged use
- Long service life suits a device used every single night
- Heavier than the EcoFlow and Jackery
- Recharge speed is mid-pack
- Priced at the top of this group
How This Was Tested
Each option was assessed for real CPAP use: usable watt-hours, how many nights it runs a typical CPAP (assessed both with and without the heated humidifier, which roughly triples power draw), recharge speed, weight for travel, and whether it runs the CPAP while simultaneously charging. CPAP machines draw roughly 30-60W without humidification and 60-110W with a heated humidifier and heated tube.
Frequently Asked Questions
A 256Wh power station (EcoFlow River 2, Jackery Explorer 240 v2) runs a typical CPAP for 2-3 nights with the heated humidifier OFF. With a heated humidifier and heated tube, power draw roughly triples and runtime drops to about one night. Turning humidification off during an outage is the simplest way to stretch backup power.
Yes, use pure sine wave. CPAP machines have sensitive electronics and a motor; a clean pure sine wave output protects them and runs them efficiently. All four options here deliver pure sine wave AC (or DC direct, in the case of the Medistrom). Avoid cheap modified or simulated sine wave units for a CPAP.
Yes. Plug the CPAP into the power station and run it normally. If your CPAP supports DC input, using the DC output avoids the small standby loss of the AC inverter and extends runtime. Many users also use pass-through charging - the power station runs the CPAP while itself recharging once mains power returns.
A dedicated CPAP battery (Medistrom Pilot-24 Lite) is compact, travel-friendly, and connects straight to the machine - but it only powers the CPAP. A general power station (EcoFlow, Jackery, Anker) is larger but also runs a light, a phone charger, or other devices during a wider outage. For whole-outage resilience, choose a power station.