Appliance Database
How Much Backup Power Does a CPAP Need?
This page is a power-planning tool for CPAP and similar low-power home medical equipment. It does not change therapy settings, recommend treatment, or replace the device manufacturer's emergency instructions.
CPAP Backup Sizer
INTERACTIVEResMed publishes 6.3 W typical / 27 W peak for AirMini and 56.1 W normal / 73.2 W maximum for AirSense 11. The custom preset is only a starting placeholder — replace it with your own device data.
Battery result uses 90% assumed system efficiency and a 20% Zaron sizing margin. Real consumption can change with humidification, heated tubing, pressure, leaks and device configuration.
ResMed technical specifications list 6.3 W typical power consumption and 27 W peak.
ResMed's AirSense 11 user guide lists 56.1 W normal power consumption and 73.2 W maximum.
Raw energy before conversion losses or reserve margin.
The key planning rule
Power-Supply Rating Is Not the Same as Typical Consumption.
The adapter tells you what the power system can provide. Runtime planning is better when you have the device's typical or measured draw.
Operating Consumption
Useful for estimating battery runtime when the manufacturer publishes it.
Maximum Consumption
Useful for ensuring the power source has enough output headroom for the documented device configuration.
Your Real Setup
A measured AC or DC draw can improve accuracy because heated humidification and accessories change demand.
Humidification matters
Accessories Can Change the Battery Math.
A full-size CPAP system can use substantially more power when humidification or heated tubing is active. Travel-oriented systems without conventional heated humidifiers can have much lower demand.
Use model-specific data rather than assuming all CPAP machines behave the same.
This is one reason measured watts are valuable for battery planning.
Only use manufacturer-approved DC accessories and voltage requirements for the specific device.
Electricity Is Only One Layer of Emergency Preparedness.
FDA guidance for home medical devices emphasizes reading the manufacturer's instructions, contacting the device supplier when necessary, and planning for outages in advance. Zaron estimates energy; it does not replace those device-specific steps.
Methodology
Transparent Math. Device-Specific Inputs.
Evidence
Manufacturer Data First. Emergency Guidance Separate.
AirSense 11
ResMed's AirSense 11 user guide lists a 65 W power supply, 56.1 W normal consumption and 73.2 W maximum consumption.
AirSense 11 guide →AirMini
ResMed technical specifications list 6.3 W typical power consumption, 27 W peak consumption and 1 W standby.
AirMini technical guide →Power-Outage Planning
FDA advises users of home medical devices to read device instructions, contact the manufacturer or distributor, and understand battery or generator options before an outage.
FDA outage guidance →Home-Use Devices
FDA maintains power-outage preparation resources for medical devices used at home.
FDA home-use devices →Common questions
Straight Answers.
Appliance database
Keep Sizing Your Backup.
Power planning belongs in a broader emergency plan
Add the Load to the Whole Backup Plan.
Combine CPAP power with lighting, refrigeration, communication and other household essentials — while keeping device-specific emergency guidance separate.
Add CPAP to Full Calculator →