How Long Will the EcoFlow River 2 Max Run a CPAP with Humidifier?
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 | 435Wh (85% via AC outlets) |
| Continuous AC output | 500W |
| Surge rating | 1000W |
| CPAP with humidifier running watts | 60W |
| Startup watts | 60W |
| Average draw | 60W |
| Estimated runtime | 7.3 hours |
| Energy per day of typical use | 480Wh |
512Wh × 0.85 = 435Wh usable ÷ 60W average = 7.3 hours
Station specs: source, checked 2026-10-17. See how we calculate runtime.
Adjust the numbers
Check the label on your CPAP with humidifier 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 with humidifier uses about 480Wh a day at 8 hours of use, so with enough panels and good sun the EcoFlow River 2 Max can run it indefinitely.
Tips
- The heated humidifier roughly doubles a CPAP's power draw. Turning it down or off is the easiest way to get more nights per charge.
- You’ll still have about 440W of AC capacity left for other devices at the same time, though they’ll share the same battery.
- 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 with humidifier
| Power station | Capacity | Output | Runtime | Verdict |
|---|---|---|---|---|
| Jackery Explorer 300 Plus | 288Wh | 300W | 4.1 hours | Yes |
| Goal Zero Yeti 500X | 505Wh | 300W | 7.2 hours | Yes |
| Anker 535 PowerHouse | 512Wh | 500W | 7.3 hours | Yes |
| DJI Power 500 | 512Wh | 1000W | 7.3 hours | Yes |
| Jackery Explorer 500 | 518Wh | 500W | 7.3 hours | Yes |
| EcoFlow River 2 Pro | 768Wh | 800W | 11 hours | Yes |
| Anker SOLIX C800 Plus | 768Wh | 1200W | 11 hours | Yes |
| Bluetti AC70 | 768Wh | 1000W | 11 hours | Yes |
FAQ
Will the EcoFlow River 2 Max run a CPAP with humidifier overnight?
No. At about 60W average it runs out after 7.3 hours. For a full night you need at least 600Wh of 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.