Typical wattage range
35-75 W. Use a measured average when the device matters.
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Camping
12V portable cooler Runtime Estimate
12V coolers can be efficient on DC, but duty cycle depends on ambient temperature and insulation.
Planning default
50 W at 60% duty cycle, or about 30 W average load.
Confidence label
Estimated. Treat the result as a planning estimate, not a lab measurement.
1,024 Wh example
With 90% efficiency and a 10% reserve, about 829 Wh remains usable. At the default load, that is roughly 1d 3h.
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 50 W if you do not have a watt-meter reading yet.
- 12V portable cooler is treated as a cycling load at 60% duty cycle, so the calculator averages the running watts over time.
- 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.
- Cycling devices can run longer or shorter depending on ambient temperature, thermostat settings, insulation, and door openings.
Sources
- 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.
Mini fridge
50-100 W, default 75 W, confidence: Estimated.