How to Power a CPAP Machine During a Power Outage
By Portable Power Stations, Solar Generators | Published: 2026-10-14
Category: How-to Guides
Learn how to keep your CPAP running during an outage with a power station or solar generator. Match your machine's needs to the right backup and avoid common mistakes.
Quick answer
To keep your CPAP running during a power outage, use a battery-based power station sized to your machine's wattage and the number of nights you need. For most users, a mid-size unit like the Yeti 500X with a 120W power supply works for one to two nights, while longer outages call for a larger Yeti 1500X or a solar generator with panels. The key is matching capacity to your CPAP's actual power draw, not the label on the box.
Why a standard outlet won't save you in an outage
During a blackout, your CPAP loses power the moment the grid goes down. A UPS battery backup for a computer won't last through the night, and a gas generator is overkill for a device that draws less than 100 watts. The practical solution is a portable power station or solar generator that you can keep charged and ready indoors. Unlike a medical battery that only powers one device, these units can also run a phone charger, a small fan, or a lamp, which matters when an outage stretches past a few hours.
How to size a power station for your CPAP
Start by finding your CPAP's wattage. Most machines draw between 30 and 60 watts without a humidifier, but heated humidifiers can push that to 90 watts or more. Check the label on your power brick or the manual. Then estimate your nightly runtime. If you sleep seven hours and your CPAP draws 50 watts, that's 350 watt-hours per night. Add 20 percent for inefficiency. A power station with at least 500 watt-hours will cover one night with margin; 1,000 watt-hours or more gives you two nights or room for a humidifier. If you plan to use a solar generator, match panel wattage to your daily consumption and available sunlight, not to the station's maximum input.
Setting up your CPAP for an outage
Before the next storm, charge your power station to full and test your CPAP on it for a full night. This reveals your actual runtime and any compatibility issues. Turn off the humidifier and heated tube if you need to stretch capacity. Use the 12V DC output if your CPAP has a DC adapter, since it avoids the efficiency loss of converting to AC. Keep the station in a ventilated spot, not under blankets, and never run a gas generator indoors. For multi-night outages, pair your station with solar panels and place them in direct sun during the day.
When to choose a larger home backup system
If outages in your area last more than two nights, or if you need to power other medical devices or a refrigerator, a single mid-size station may not be enough. In that case, a home backup system with expandable batteries makes more sense. The 16 kWh Haven Home Backup, for example, includes a Yeti Pro 4000 and three Yeti Pro Tank Batteries, and it can back up 10 circuits in your home, which could include the outlet your CPAP uses. That's a permanent installation, not a portable solution, so weigh the cost and complexity against how often you lose power.
Diagnose your CPAP outage problem
- Symptom: CPAP shuts off after a few hours on battery: Likely cause: your power station's capacity is too small for your CPAP's actual draw, especially if the humidifier or heated tube is on. Corrective action: turn off humidification and heating, then calculate your watt-hours and compare to your station's capacity. If you're still short, step up to a larger station or add expansion batteries. If runtime is under six hours with humidifier off, you need more capacity.
- Symptom: CPAP won't power on from the station at all: Likely cause: the station's AC output is off, or your CPAP's power brick requires a pure sine wave inverter that your station lacks. Corrective action: check that the AC outlet is enabled and try a different outlet. If your CPAP uses a proprietary connector, use the 12V DC port with the correct adapter. If it still won't run, your station may not be compatible. If the station works for a lamp but not the CPAP, the issue is likely waveform or connector compatibility.
- Symptom: You need backup for more than two nights: Likely cause: a single portable station can't keep up with repeated overnight use without recharging. Corrective action: add solar panels to recharge during the day, or consider a home backup system like the Haven Home Backup if outages are frequent. For camping, a solar generator with 200W or more of panels can extend runtime indefinitely with good sun. If you can't recharge daily, choose a system with expandable batteries or a permanent transfer switch.
Product facts that matter for CPAP backup
- Yeti X 120W Power Supply: The Yeti X 120W Power Supply charges a Yeti 200X or 500X in half the time and is also a replacement for the Yeti 1000X, 1000 Core, and 1500X. It is not compatible with Yeti Lead Acid or Yeti Lithium power stations. If you already own a compatible Yeti station, this supply cuts recharge time between outages. Check your model first, because older Yeti lines won't work with it.
- Yeti Link Expansion Module V3: The Yeti Link Expansion Module V3 connects Tank Expansion Batteries to a Yeti 1500X or larger X-line power station. It includes a 120W power supply and is not compatible with the Yeti 1000X. It cannot be used at the same time as the Yeti Lithium MPPT Solar Charging Optimization Module. This lets you add capacity to a compatible Yeti station for longer outages without buying a whole new system. If you own a Yeti 1000X, this module won't work for you.
- 16 kWh Haven Home Backup: The 16 kWh Haven Home Backup provides approximately 16,000 watt hours and can back up 10 circuits. It includes a Yeti Pro 4000, three Yeti Pro Tank Batteries, and a Haven 10 transfer switch. For frequent or long outages, this whole-home system can keep your CPAP circuit live without manual setup each time. It's a permanent install, so it suits homeowners rather than renters or campers.
