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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

Planning wattage range

30-60 W. Use this as a planning estimate, not a guaranteed runtime claim.

Planning default

40 W × 100% = 40 W (Average load).

Confidence

estimated. Use this as a planning estimate, not a guaranteed runtime claim.

Static example · 1,024 Wh

Assumptions: 40 W, 100% duty cycle, 85% AC efficiency, 10% reserve, new battery, no temperature loss. Usable capacity: 783 Wh. Estimated runtime: 19h 35m. Fixed station overhead unknown; not included. Runtime does not prove a station can start a compressor or motor.

Evidence behind these load values

Published device values and editorial calculator assumptions have different evidence. An editorial range is a starting input, not a measured category range; replace it with your device reading. Context links explain units or compatibility and do not prove the numbers. The check date records the evidence classification, not a new hardware test.

Evidence type
Editorial planning default
Source type
Official · Editorial
Confidence
Estimated
Conditions
Humidifiers and heated tubes can more than double power draw. Users should check their device label and prescription setup. This is a comfort-focused estimate, not medical advice. Use the device manufacturer's battery guidance for critical backup planning. CPAP values are editable planning assumptions, not a manufacturer-approved battery prescription. Check the exact device, pressure, humidifier, heated tube, approved converter and output path with the manufacturer and care provider. Adapter wattage is not measured therapy consumption. Do not change prescribed therapy to meet an estimate.
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Evidence behind these load values
ValueEvidence typeConditionsSource and datesConfidence
Planning wattage range30-60 WEditorial planning default
  • Operating state: Unknown
  • Output path: Unknown
  • Measurement interval: Unknown
No separately attributed sourceSource date: UnknownChecked:
estimated
Planning default40 WEditorial planning default
  • Operating state: Unknown
  • Output path: Unknown
  • Measurement interval: Unknown
No separately attributed sourceSource date: UnknownChecked:
estimated
Duty cycle100%Editorial planning default
  • Operating state: Unknown
  • Output path: Unknown
  • Measurement interval: Unknown
No separately attributed sourceSource date: UnknownChecked:
estimated

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.
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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.

Planning notes

  • Assumptions: 40 W, 100% duty cycle, 85% AC efficiency, 10% reserve, new battery, no temperature loss.
  • Humidifiers and heated tubes can more than double power draw. Users should check their device label and prescription setup. This is a comfort-focused estimate, not medical advice. Use the device manufacturer's battery guidance for critical backup planning. CPAP values are editable planning assumptions, not a manufacturer-approved battery prescription. Check the exact device, pressure, humidifier, heated tube, approved converter and output path with the manufacturer and care provider. Adapter wattage is not measured therapy consumption. Do not change prescribed therapy to meet an estimate.
  • Keep reserve for cold weather, battery age, and load changes.

Assumptions to check

  • These are calculated planning estimates, not measured runtimes. Actual results vary with load, battery condition, temperature, and output path.
  • Use these numbers only as a battery-planning estimate, not medical advice. For critical backup, follow the device manufacturer's battery guidance, ask your clinician or equipment provider when needed, and test the exact setup before relying on it overnight.

Sources

  • Manufacturer CPAP battery product page (official) - Manufacturer-specific PAP battery compatibility and conditional runtime guidance. This page does not establish the generic scenario wattage range or default; heating, tubing, pressure and the exact device affect runtime.
  • ResMed CPAP battery and power converters (official) - Exact-device battery and converter compatibility guidance. Converter wattage is a supply rating, not measured therapy consumption or proof of these editorial load assumptions.
  • 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.