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Portable fan Runtime Estimate

Fans are usually good power-station loads. Check the label because speed setting changes draw.

Use this load in the runtime calculator

Planning wattage range

20-75 W. Use this as a planning estimate, not a guaranteed runtime claim.

Planning default

35 W × 100% = 35 W (Average load).

Confidence

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

Static example · 1,024 Wh

Assumptions: 35 W, 100% duty cycle, 85% AC efficiency, 10% reserve, new battery, no temperature loss. Usable capacity: 783 Wh. Estimated runtime: 22h 23m. 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
Editorial · Official
Confidence
Estimated
Conditions
Fans are usually good power-station loads. Check the label because speed setting changes draw.
Swipe table sideways
Evidence behind these load values
ValueEvidence typeConditionsSource and datesConfidence
Planning wattage range20-75 WEditorial planning default
  • Operating state: Unknown
  • Output path: Unknown
  • Measurement interval: Unknown
No separately attributed sourceSource date: UnknownChecked:
estimated
Planning default35 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.
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

Planning notes

  • Assumptions: 35 W, 100% duty cycle, 85% AC efficiency, 10% reserve, new battery, no temperature loss.
  • Fans are usually good power-station loads. Check the label because speed setting changes draw.
  • 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.

Sources

Use this load in the runtime calculatorCheck source wattage rangesFind a practical power station sizeCompare runtime by battery capacity

Related Scenarios

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