Anker runtime estimate
Will the Anker 521 PowerHouse run a CPAP?
Estimate: about 0.5 nights with heated humidifier on, 0.9 nights with humidifier off, or 1.1 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 | 256 Wh |
|---|---|
| Usable estimate | 256 Wh x 0.85 = 218 Wh on AC inverter |
| AC inverter | 200 W continuous fixture value |
| Chemistry | LiFePO4 |
| Weight | 8.2 lb |
| MSRP | $249, fixture checked 2026-06-12 |
| Source | https://www.anker.com/products/a1720 |
Line-by-line math
- CPAP humidifier on: 256 Wh x 0.85 = 218 Wh / 53 W = 4.1 h = 0.5 nights.
- CPAP humidifier off: 256 Wh x 0.85 = 218 Wh / 30 W = 7.3 h = 0.9 nights.
- Compatible DC cable: 256 Wh x 0.92 = 236 Wh / 28 W = 8.4 h = 1.1 nights.
- Full-size refrigerator: 256 Wh x 0.85 = 218 Wh / 150 W = 1.5 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.