Fridge Backup Calculator
How long can a portable power station keep your fridge cold during a power outage? Select your fridge type and battery size. This calculator accounts for compressor duty cycles — fridges don't run at full power continuously.
Estimated Fridge Runtime
36.5
hours
Mini-Fridge on 1024Wh battery
Surge requirement
130W
Your power station must handle at least 130W surge when the compressor kicks on.
How we calculated this
- Compressor watts: 65W
- Duty cycle: 33% (compressor cycles on/off)
- Average draw: 21W
- Efficiency: 85%
- Reserve: 10%
- Usable: 870 Wh → After reserve: 783 Wh
Real fridge runtime varies heavily by ambient temperature, door openings, thermostat setpoint, and compressor age.
Fridge Runtime
36.5 hrs
Surge needed
130W