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.

Fridge type

Battery capacity (Wh)

Reserve buffer

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.

Stations that can handle a mini-fridge (130W surge)

These stations meet or exceed 1024Wh. Prices link to Amazon.

Best fit:EcoFlow DELTA 3 Plus

1024 Wh battery · 1800W output · 1000W solar · 12.5 kg

$799

Buy on Amazon

Anker SOLIX C1000

1056 Wh battery · 1800W output · 600W solar · 13 kg

$430$799

Buy on Amazon

Also available at Anker.com

Goal Zero Yeti 1000 Core

983 Wh battery · 1200W output · 300W solar · 14.4 kg

$900

Buy on Amazon

Fridge Runtime

36.5 hrs

Surge needed

130W