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Full-size refrigerator Runtime Estimate

Fridges cycle on and off. The calculator treats the entered wattage as compressor running wattage and applies a duty-cycle estimate.

Use this load in the runtime calculator

Typical wattage range

300-800 W. Use a measured average when the device matters.

Planning default

500 W at 33% duty cycle, or about 165 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 4h 45m.

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
Source-reported range · Editorial planning default · Manufacturer typical value
Source type
Editorial · Official
Confidence
Estimated
Conditions
Fridges cycle on and off. The calculator treats the entered wattage as compressor running wattage and applies a duty-cycle estimate.
Swipe table sideways
Evidence behind these load values
ValueEvidence typeConditionsSource and datesConfidence
Typical wattage range300-800 WSource-reported range
  • Operating state: Cycling
  • Output path: AC
  • Measurement interval: Unknown
EnergySage refrigerator wattage guideSource date: UnknownChecked:
estimated
Planning default500 WEditorial planning default
  • Operating state: Cycling
  • Output path: AC
  • Measurement interval: Unknown
No separately attributed sourceSource date: UnknownChecked:
estimated
Startup surge2,900 WManufacturer typical value
  • Operating state: Startup
  • Output path: AC
  • Measurement interval: Unknown
Generac Home Standby Buyers Guide wattage worksheetSource date: UnknownChecked:
estimated
Duty cycle33%Editorial planning default
  • Operating state: Cycling
  • Output path: AC
  • Measurement interval: Unknown
EnergySage refrigerator wattage guideSource 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

Check surge and output

  • Runtime does not prove a station can start a compressor or motor.
  • Compare device startup watts with the station surge rating.
  • Compare running watts with the station continuous output rating.

Check startup surge

How to use this scenario

  • Start with 500 W if you do not have a watt-meter reading yet.
  • Full-size refrigerator is treated as a cycling load at 33% 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.
  • Runtime does not prove the station can start or safely run the load. Check continuous output and startup surge before trusting a station.

Sources

Use this load in the runtime calculatorOpen the dedicated Full-size refrigerator calculatorCheck source wattage rangesFind a practical power station sizeCompare runtime by battery capacityCheck startup surge

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 a 24-hour fridge outage

Start from the outage duration, then reverse the runtime formula using the refrigerator scenario's sourced wattage range and duty-cycle assumption.

Related Scenarios

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

LED TV

60-150 W, default 100 W, confidence: Estimated.