EcoFlow runtime estimate
Will the EcoFlow RIVER 2 Max run a CPAP?
Estimate: about 1.0 nights with heated humidifier on, 1.8 nights with humidifier off, or 2.1 nights using a compatible CPAP DC converter cable.
A CPAP is a medical device. These are runtime estimates, not medical advice or a medical-safety guarantee. Test your exact setup at home before relying on it.
| Rated capacity | 512 Wh |
|---|---|
| Usable estimate | 512 Wh x 0.85 = 435 Wh on AC inverter |
| AC inverter | 500 W continuous fixture value |
| Chemistry | LiFePO4 |
| Weight | 13.4 lb |
| MSRP | $469, fixture checked 2026-06-12 |
| Source | https://www.ecoflow.com/us/river-2-max-portable-power-station |
Line-by-line math
- CPAP humidifier on: 512 Wh x 0.85 = 435 Wh / 53 W = 8.2 h = 1.0 nights.
- CPAP humidifier off: 512 Wh x 0.85 = 435 Wh / 30 W = 14.5 h = 1.8 nights.
- Compatible DC cable: 512 Wh x 0.92 = 471 Wh / 28 W = 16.8 h = 2.1 nights.
- Full-size refrigerator: 512 Wh x 0.85 = 435 Wh / 150 W = 2.9 h.
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Try this model with your loads
Pick loads, hours, and whether CPAP uses an AC inverter or a compatible DC converter cable.
A CPAP is a medical device. These are runtime estimates, not medical advice or a medical-safety guarantee. Test your exact setup at home before relying on it.