What Size Generator Do I Need for a Refrigerator?

Understanding the Power Requirements

A refrigerator seems like a simple load, but the startup surge is what catches most people off guard. Modern inverter-compressor refrigerators (2015+) have dramatically lower surge than older units, but any refrigerator with a traditional compressor motor will spike 3–5× its running wattage when the compressor starts. For a refrigerator drawing 150 watts while running, the startup surge can hit 600–1,200 watts for 1–3 seconds.

Standard full-size refrigerators (18–26 cubic feet) draw 100–400 watts while the compressor runs, but the compressor doesn't run continuously — it cycles on for 10–20 minutes per hour depending on ambient temperature and how often the door is opened. The average continuous draw is closer to 30–80 watts when you account for the off-cycle. The surge at compressor startup is the critical number for generator sizing.

Choosing the Right Generator Size

For a refrigerator alone, a 1,000-watt generator technically meets the minimum surge requirement, but you'd have zero headroom for anything else. A 2,000-watt inverter generator is the sweet spot — it handles the compressor surge, runs efficiently at partial load, and powers lights and phone chargers simultaneously. If you also need a sump pump or freezer, step up to 3,500–5,000 watts.