How Long Will the EcoFlow River 2 Max 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 | 512Wh (LFP) |
|---|---|
| Usable energy | 471Wh (92% via 12V/USB DC output) |
| Continuous AC output | 500W |
| Surge rating | 1000W |
| CPAP machine running watts | 30W |
| Startup watts | 30W |
| Average draw | 30W |
| Estimated runtime | 16 hours |
| Energy per day of typical use | 240Wh |
512Wh × 0.92 = 471Wh usable ÷ 30W average = 15.7 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 Max accepts up to 220W of solar input. In real conditions that harvests about 825Wh on a sunny day (5 peak-sun hours), or about 750Wh with one 200W panel.
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 Max 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 Max’s DC port instead of the AC outlet avoids inverter losses: about 36Wh more usable energy.
- The EcoFlow River 2 Max 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 |
|---|---|---|---|---|
| Jackery Explorer 300 Plus | 288Wh | 300W | 8.8 hours | Yes |
| Goal Zero Yeti 500X | 505Wh | 300W | 15 hours | Yes |
| Anker 535 PowerHouse | 512Wh | 500W | 16 hours | Yes |
| DJI Power 500 | 512Wh | 1000W | 16 hours | Yes |
| Jackery Explorer 500 | 518Wh | 500W | 16 hours | Yes |
| EcoFlow River 2 Pro | 768Wh | 800W | 24 hours | Yes |
| Anker SOLIX C800 Plus | 768Wh | 1200W | 24 hours | Yes |
| Bluetti AC70 | 768Wh | 1000W | 24 hours | Yes |
FAQ
Will the EcoFlow River 2 Max run a CPAP machine overnight?
Yes. Eight hours uses about 240Wh, roughly 51% of the EcoFlow River 2 Max’s usable capacity.
How long does the EcoFlow River 2 Max take to recharge with solar?
With its maximum 220W of solar input it refills in about 3.1 hours of strong sun. With a single 200W panel, expect about 3.4 hours of full sun.
Is the EcoFlow River 2 Max 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.