Typical wattage range
20-75 W. Use a measured average when the device matters.
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Portable fan Runtime Estimate
Fans are usually good power-station loads. Check the label because speed setting changes draw.
Planning default
35 W at 100% duty cycle, or about 35 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 22h 23m.
Evidence behind these load values
The value class and conditions stay separate from the number. Missing source details remain unknown rather than becoming assumptions.
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.
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.
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.
How to use this scenario
- Start with 35 W if you do not have a watt-meter reading yet.
- Portable fan 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.
Sources
- Reliant appliance energy comparison (editorial) - Compares common home device wattage such as LED TV, desktop computer, fan, microwave, and space heater.
- U.S. Department of Energy power and energy definitions (official) - Defines watts, volts, amps, and kilowatt-hours for the site's unit conversions; it is methodological context, not a source for individual appliance wattage ranges.
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.
Electric blanket
50-150 W, default 100 W, confidence: Estimated.