How Long Will the EcoFlow River 2 Run a CPAP Machine?
Updated 2026-10-17 · Yes
Medical equipment: these are estimates. Test your own setup and keep a backup plan.
The numbers
| Battery capacity | 256Wh (LFP) |
|---|---|
| Usable energy | 236Wh (92% via 12V/USB DC output) |
| Continuous AC output | 300W |
| Surge rating | 600W |
| CPAP machine running watts | 30W |
| Startup watts | 30W |
| Average draw | 30W |
| Estimated runtime | 7.9 hours |
| Energy per day of typical use | 240Wh |
256Wh × 0.92 = 236Wh usable ÷ 30W average = 7.9 hours
Station specs: source, checked 2026-10-17. See how we calculate runtime.
Adjust the numbers
Check the label on your CPAP machine and enter its real wattage.
Recharging with solar
The EcoFlow River 2 accepts up to 110W of solar input. In real conditions that harvests about 413Wh on a sunny day (5 peak-sun hours).
Solar can keep up. A CPAP machine uses about 240Wh a day at 8 hours of use, so with enough panels and good sun the EcoFlow River 2 can run it indefinitely.
Tips
- Figures assume the humidifier and heated tube are off. Running a CPAP from its 12V/DC adapter instead of the AC outlet stretches runtime noticeably.
- Running it from the EcoFlow River 2’s DC port instead of the AC outlet avoids inverter losses: about 18Wh more usable energy.
- The EcoFlow River 2 uses LiFePO4 (LFP) cells, rated for thousands of cycles, so running it down daily won’t wear it out quickly.
Other power stations running a CPAP machine
| Power station | Capacity | Output | Runtime | Verdict |
|---|---|---|---|---|
| EcoFlow River 3 | 245Wh | 300W | 7.5 hours | Yes |
| Jackery Explorer 240 v2 | 256Wh | 300W | 7.9 hours | Yes |
| Bluetti EB3A | 268Wh | 600W | 8.2 hours | Yes |
| Jackery Explorer 300 Plus | 288Wh | 300W | 8.8 hours | Yes |
| Anker SOLIX C300 | 288Wh | 300W | 8.8 hours | Yes |
| Goal Zero Yeti 500X | 505Wh | 300W | 15 hours | Yes |
| EcoFlow River 2 Max | 512Wh | 500W | 16 hours | Yes |
| Anker 535 PowerHouse | 512Wh | 500W | 16 hours | Yes |
FAQ
Will the EcoFlow River 2 run a CPAP machine overnight?
No. At about 30W average it runs out after 7.9 hours. For a full night you need at least 300Wh of capacity.
How long does the EcoFlow River 2 take to recharge with solar?
With its maximum 110W of solar input it refills in about 3.1 hours of strong sun. A single 200W panel is enough to max out its solar input.
Is the EcoFlow River 2 safe for medical equipment?
These are estimates, not medical advice. Check your device’s actual power draw, test your setup before you rely on it, and always keep a backup plan approved by your doctor or equipment supplier.