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Medical comfort

CPAP without heated humidifier Runtime Estimate

Humidifiers and heated tubes can more than double power draw. This is a comfort-focused estimate, not medical advice. Use the CPAP manufacturer's battery guidance for critical planning.

Use this load in the runtime calculator

Typical wattage range

30-60 W. Use a measured average when the device matters.

Planning default

40 W at 100% duty cycle, or about 40 W average load.

Confidence label

Estimated. Treat the result as a planning estimate, not a lab measurement.

1,024 Wh example

With 85% efficiency and a 10% reserve, about 783 Wh remains usable. At the default load, that is roughly 19h 35m.

Evidence behind these load values

The value class and conditions stay separate from the number. Missing source details remain unknown rather than becoming assumptions.

Evidence type
Unknown
Source type
Official · Editorial
Confidence
Estimated
Conditions
Humidifiers and heated tubes can more than double power draw. This is a comfort-focused estimate, not medical advice. Use the CPAP manufacturer's battery guidance for critical planning.

Device measurement guide

Use the measured average

Enter a steady watt reading or a full-cycle average in the runtime calculator. Use 100% duty cycle for an average that already includes on and off periods.

Device wattage (W)
Read watts after a steady load settles; record energy over time for a cycling load.
Duty cycle (%)
Average watts calculated from Wh divided by hours already include off-cycle time, so do not apply duty cycle again.

How to Measure Device Watts for Runtime Planning

Use this load in the runtime calculator

Verify your watts

  • Check the device label for running watts or input amps and volts.
  • Use a plug-in watt meter for AC loads when the result matters.
  • For cycling loads, measure long enough to capture on/off behavior.

Open wattage library

Check output path

  • AC inverter loads usually lose more energy than direct DC loads.
  • Keep reserve for cold weather, battery age, and load changes.
  • Do not treat label capacity as fully usable watt-hours.

Read the method

Medical-device planning

  • Use this site as a planning estimate, not medical advice.
  • Follow the device manufacturer's battery guidance.
  • Test the full setup before relying on it overnight.

How to use this scenario

  • Start with 40 W if you do not have a watt-meter reading yet.
  • CPAP without heated humidifier is treated as a continuous load, so runtime is sensitive to the real wattage you enter.
  • Keep at least a planning reserve because battery age, temperature, output path, and device settings can move the result.

Watch-outs

  • The scenario wattage is an estimate. Measure the real load before relying on it for outage, travel, or critical planning.
  • For CPAP or other medical-comfort planning, use the device manufacturer's battery guidance for critical backup decisions.

Sources

  • Manufacturer CPAP battery product page (official) - Manufacturer page documents a PAP battery pack for continuing therapy away from regular power; runtime still depends on the device setup.
  • CPAP wattage range guide (editorial) - CPAP-focused medical equipment guide gives generic planning ranges for standard CPAP, humidifier, and heated-tube use.
Use this load in the runtime calculatorOpen the dedicated CPAP No-Humidifier calculatorCheck source wattage rangesFind a practical power station sizeCompare runtime by battery capacity

Runtime on Real Stations

These station-specific pages reuse this scenario's wattage assumptions with source-linked model specs. They are estimates, not measured runtimes.

Target-duration Plans

Start from a target time, then reverse the runtime formula into a required Wh class.

Plan two CPAP nights

This pilot uses an explicit 8-hour-per-night planning target and the no-heated-humidifier CPAP scenario. Change the hours and watts if your prescribed setup differs.

Related Scenarios

Compare nearby loads before assuming one wattage profile covers your setup.

Travel CPAP

5-20 W, default 12 W, confidence: Estimated.