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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

Planning wattage range

300-800 W. Use this as a planning estimate, not a guaranteed runtime claim.

Planning default

500 W × 33% = 165 W (Average load).

Confidence

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

Static example · 1,024 Wh

Assumptions: 500 W, 33% duty cycle, 85% AC efficiency, 10% reserve, new battery, no temperature loss. Usable capacity: 783 Wh. Estimated runtime: 4h 45m. 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
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
Planning 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

Planning notes

  • Assumptions: 500 W, 33% duty cycle, 85% AC efficiency, 10% reserve, new battery, no temperature loss.
  • Fridges cycle on and off. The calculator treats the entered wattage as compressor running wattage and applies a duty-cycle 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.
  • Runtime does not prove a station can start a compressor or motor.

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.