CPAP backup calculator

Estimate how many nights a power station can run a CPAP.

Use your machine's wattage, humidifier setting, battery size, usable capacity, and sleep schedule to get a practical backup estimate before shopping.

Estimated coverage 1.3 nights

A 500Wh class station is close for a one-night CPAP backup.

Inputs

Machine and battery

CPAP running watts Use a meter or manufacturer power specs when possible. Humidifier/heated tube setting Heat can change CPAP battery runtime a lot. Power station capacity Use the listed watt-hours, such as 300Wh, 500Wh, or 1000Wh. Usable battery percent Accounts for inverter losses, reserve, and real-world headroom. Hours per night Use your usual sleep window plus a little margin. Nights needed Used to estimate the battery class you should compare.

Important CPAP note

This is a sizing estimate, not medical advice. If CPAP backup is medically critical, confirm the backup plan with your equipment provider or clinician and check your exact machine's power requirements.

CPAP backup guides

Use the estimate before picking a size class

Guide

Power station size for CPAP

See what to check before choosing a CPAP backup battery.

Read guide

Overnight

Can a power station run a CPAP overnight?

Understand the settings that change one-night runtime.

Read guide

Recharge

Solar recharge time calculator

Check whether a panel can refill the station before the next night.

Open calculator