What size power station do you need to keep a fridge running for 24 hours?
Short answer: 2,033 Wh of rated capacity — that's the ~2 kWh — large class. A full day of refrigeration is the most common blackout-prep goal.
The math, appliance by appliance
Appliance
Avg draw
Hours used
Energy
Refrigerator (full-size)
60 W
24 h
1,440 Wh
Energy needed per day
1,440 Wh
÷ 0.85 inverter efficiency
1,694 Wh
× 1.2 headroom (ageing, cold, overrun)
2,033 Wh
Recommended: ~2 kWh — large class. Output check: 150 W continuous, 900 W surge.
Fridges and freezers use their average cycling draw for energy and full compressor draw for the output check — that's why the numbers differ from the label.
The bare energy need is 1,694 Wh after inverter losses; the extra 20% covers battery ageing, cold weather, and outages running long. A smaller unit works on a good day — this size works on a bad one.
What about output watts, not just capacity?
The station must sustain 150 W continuous and survive a 900 W start-up surge. Nearly every unit in the ~2 kWh clears both comfortably.
Could solar keep this running indefinitely?
Roughly 480 W of panels replaces a day's usage with ~4 hours of decent sun at real-world (75%) efficiency. Half that solar doubles your runtime instead of sustaining it.