CPAP Power Backup: Keeping Sleep Apnea Therapy Running During an Outage
A CPAP machine draws relatively little power — most units use well under 100W continuous — which makes a small, dedicated battery backup a practical option instead of running a full generator overnight.
Check your CPAP model's power draw (listed on its power supply or manual) against a battery's rated capacity in watt-hours to estimate how many nights of runtime you'll get. Humidifier and heated-tube settings increase draw noticeably.
For a multi-night outage, a dedicated CPAP battery or small power station is the more reliable choice over a generic phone power bank — see the picks below.
Relevant picks
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How many nights will a CPAP battery last?
It depends on your machine's draw and the battery's watt-hour rating — a typical CPAP without humidifier draws 30-60W, so a 100Wh battery gives roughly 1.5-3 hours per full charge, while a dedicated 300Wh+ CPAP battery can cover a full night or more. Check your specific machine's power supply label for its actual wattage rather than assuming.
Does running the humidifier drain the battery faster?
Yes, noticeably — a heated humidifier and heated tube can roughly double a CPAP's power draw. If you're planning for a multi-night outage on a limited battery, running without the humidifier (or on a lower heat setting) meaningfully extends runtime.
Can I use a regular USB power bank for my CPAP?
Most standard phone power banks don't supply the right voltage or continuous wattage a CPAP needs — you generally need a battery designed for CPAP use (often with the machine's specific DC connector) or a small power station with an AC outlet matching your CPAP's power supply.
Should I talk to my doctor about a backup power plan?
Yes — if CPAP therapy is medically necessary for you, your physician or equipment supplier can advise on your specific machine's requirements and whether your insurance covers a battery backup as durable medical equipment.