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CPAP on Battery Backup: Which Power Stations Actually Last a Full Night?

Real overnight draw for a CPAP, and why the inverter's waveform matters as much as the battery's capacity.

7 min read·Gridalyn team

A CPAP without a heated humidifier draws roughly 30-60W. Turn the humidifier on and that climbs to 60-90W, since it's heating water, not just running a motor. Over an 8-hour night, that's the difference between ~360Wh and ~720Wh needed.

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CPAP machines are sensitive to waveform. A modified sine wave inverter (cheaper, common in bargain power banks) can cause humming, overheating, or motor damage in some CPAP models. Confirm pure sine wave output before trusting any unit with a medical device overnight.

Unit
Capacity
Nights covered*
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*Assumes ~70W average draw (humidifier on) and ~90% inverter efficiency. Your CPAP's actual draw is printed on its data label or manual.

The short version

Check your CPAP's printed wattage, confirm pure sine wave output on the unit, then size to at least 1.5× a single night's draw so one bad recharge day doesn't leave you short.