Build an overnight energy budget before choosing a battery. Match your device, prescribed setup and backup duration to a compatible power source.
If you measured the entire setup with your normal settings, enter that total in the base field and set extra watts to zero. Do not double-count heat already included in the measurement.
The extra-watts field is a budgeting input, not a therapy control. Do not disable prescribed features to make a small battery fit. The examples do not predict the effect of settings on your specific machine.
Target Wh = total W × hours/night × nights ÷ 0.90 × 1.20.
* Planning nights = capacity × 0.90 ÷ 1.20 ÷ (total W × hours/night). Assumptions: 90% efficiency + 20% margin.
Full starting charge. No recharge assumed. Fractional nights are energy estimates, not verified complete therapy sessions. Measure with your actual power supply or approved converter and operating setup.
CHECK THE CAPACITY SHORTLIST →Lower-draw illustration. The unrounded capacity target is 213.33 Wh. Not a manufacturer CPAP specification.
Higher-draw illustration. Includes 20 W base plus 40 W additional draw. Replace both with actual measured inputs.
No-recharge target for three identical nights. A base 1 kWh battery falls below this scenario’s energy budget.
These are conditional power-station candidates based on published capacity and output. No model is presented here as universally compatible with CPAP or medically approved.
Consider only when your measured overnight budget fits. The 286 Wh base unit meets the 20 W eight-hour example, but falls below the 60 W example.
Required check: Confirm that both manufacturers permit this use, verify the exact CPAP supply or converter, and test a complete session before relying on it.
CHECK OFFICIAL SPECS ↗Consider when a larger overnight energy budget or multiple lower-draw nights matter. Verify the exact configuration and approved connection pathway.
Required check: Confirm that both manufacturers permit this use, verify the exact CPAP supply or converter, and test a complete session before relying on it.
CHECK OFFICIAL SPECS ↗Compare when its connectors, capacity and current price fit. Rated watt-hours alone do not establish CPAP compatibility or medical suitability.
Required check: Confirm that both manufacturers permit this use, verify the exact CPAP supply or converter, and test a complete session before relying on it.
CHECK OFFICIAL SPECS ↗Generic illustrations, not product photographs. Manufacturer specifications reviewed October 4, 2026. This is a specification-based comparison, not hands-on testing. Prices and availability remain on official listings. Links have no affiliate tracking.
| Model | Rated battery | Continuous AC | 20 W / planning nights | 60 W / planning nights |
|---|---|---|---|---|
| EcoFlow RIVER 3 Plus | 286 Wh | 600 W | 1.34 | 0.45 |
| EcoFlow DELTA 3 Plus | 1,024 Wh | 1,800 W | 4.80 | 1.60 |
| Jackery Explorer 1000 v2 | 1,070 Wh | 1,500 W | 5.02 | 1.67 |
Rated capacity: 286 Wh
Continuous AC: 600 W
20 W / 8 h: 1.34 planning nights
60 W / 8 h: 0.45 planning nights
Rated capacity: 1,024 Wh
Continuous AC: 1,800 W
20 W / 8 h: 4.80 planning nights
60 W / 8 h: 1.60 planning nights
Rated capacity: 1,070 Wh
Continuous AC: 1,500 W
20 W / 8 h: 5.02 planning nights
60 W / 8 h: 1.67 planning nights
These constant-load illustrations do not predict a particular machine’s consumption. Heater duty cycle, prescribed pressure, ambient conditions and the power pathway can change actual draw. A decimal night does not guarantee a complete night.
Confirm that the power station’s output voltage and waveform meet the CPAP manufacturer’s requirements. Use the specified device power supply and follow its instructions.
A matching-looking plug does not establish compatibility. Verify input voltage, regulated output, polarity, current and the exact converter listed for your CPAP model.
A model-compatible dedicated battery may fit your needs better than a general power station. Ask your equipment provider about current supported battery options and realistic runtime for your prescribed setup.
ResMed publishes model-specific battery and converter guidance. Its AirSense 11 and earlier-device accessories must not be treated as interchangeable. Confirm the exact accessory against current manufacturer documentation.
Plan with your normal prescribed setup, including heated humidification or heated tubing when used. These functions contribute to the total energy budget; their draw can vary during the night.
A supply label’s watt rating is not a measured nightly average. If you have energy data for a full session, divide its watt-hours by the session duration to get a useful average planning draw.
For example, a measured 400 Wh over eight hours averages 50 W. With the Zaron assumptions, its one-night battery target is 400 ÷ 0.90 × 1.20 = 533.33 Wh. This arithmetic is illustrative, not a machine rating.
A 600 W inverter can have only 286 Wh of storage. At the illustrative 60 W load, this method gives 3.58 planning hours — less than an eight-hour session. Confirm both output compatibility and sufficient watt-hours.
Check CPAP and power-station instructions for compatibility and restrictions on medical loads. Obtain the exact supported supply or converter.
Test under your provider’s guidance with your real device, settings and accessories. A capacity calculation cannot replace a full-session verification.
Check low-load shutoff, AC/DC timeout, sleep modes and battery cutoff behavior. Confirm the output remains available throughout the session.
A marketed UPS mode is not proof of medically suitable continuity. Follow manufacturer restrictions and confirm how the device behaves if mains power disappears.
Charge according to instructions. For multiple nights, plan reliable recharge or enough capacity without it. Allow for temperature, aging and standby losses.
Arrange an alternative power source or location if backup fails or the outage continues. Life-support ventilation and oxygen equipment require separate specialized planning.
90% efficiency and 20% margin are Zaron planning assumptions, not medical recommendations or universal constants. They do not account precisely for every inverter or DC converter. The model assumes a constant average load, full starting charge and no additional connected loads.
There is no universal choice. Start with the exact machine, approved power connection and measured session energy. Choose capacity that covers the needed nights with reserve, then confirm both manufacturers permit the application.
Under the 20 W eight-hour illustration, the target is about 214 Wh, so 286 Wh exceeds that energy target. Under the 60 W example, it falls below the 640 Wh target. Neither calculation guarantees runtime for your machine.
Discuss any change to your prescribed setup with your care team or equipment provider. This tool models energy inputs; it does not recommend changing therapy or accessory settings to fit a battery.
No. Check the exact power-station and CPAP manuals, including medical-use restrictions and transfer behavior. Confirm the backup arrangement with your provider and verify actual operation before relying on it.
Use only a power connection supported for the exact device and source. Verify voltage, polarity, current and converter requirements. Do not infer compatibility from the plug shape.
No. This is a capacity comparison based on published power-station specifications and editable assumptions. Your equipment provider must confirm a suitable CPAP continuity plan. It does not cover life-support ventilation or oxygen equipment.