How Many Watts to Run a Refrigerator on a Generator?
A standard refrigerator draws roughly 400-800 running watts once its compressor is steady, but needs a brief starting surge of about 1,200-3,200 watts — commonly cited as 3-4x the running figure — for the compressor motor to spin up. Size your generator to at least 1,000W running and 3,000-3,500W starting for the fridge alone.
Why the range is wide
Refrigerator size, compressor age, and ambient temperature all shift where in the 1,200-3,200W starting range a specific unit lands. A larger side-by-side or French-door refrigerator-freezer combo sits toward the top of the range; a smaller top-freezer unit sits lower. An older compressor with worn bearings, or a cold garage where the compressor oil is thicker, both push the surge higher than a spec sheet's best-case number.
Fridge plus freezer together
If you're running a separate chest freezer alongside the fridge, add their running watts together for your continuous total, but size your generator's surge capacity to whichever single unit's starting watts is larger — not both starting surges added together, since they won't typically hit their startup instant at the exact same moment. Staggering which one you plug in first reduces the instantaneous demand further.
See the full appliance-by-appliance comparison in the Startup Watt Index, and the general principle in Running vs Starting Watts.
This page gives typical planning ranges, not a guaranteed figure for your specific refrigerator model — check its nameplate for actual running amps/watts where available.
Frequently Asked Questions
A standard household refrigerator (roughly 18-22 cu ft) typically draws about 400-800 running watts once its compressor is spinning steadily. Mini/compact fridges draw less, around 70-100W.
Plan for roughly 1,200-3,200 starting watts — commonly cited as about 3-4x the running-watt figure — for the brief moment the compressor motor spins up. Larger refrigerator-freezer combo units sit at the higher end of that range.
A generator with at least 1,000W running / roughly 3,000-3,500W starting capacity is a reasonable minimum for a refrigerator alone, based on published sizing guidance. If you're also running a chest freezer or other appliances at the same time, size up accordingly.
Freezers use a similar compressor-motor design and a comparable running/starting range to refrigerators, though larger chest freezers can run toward the higher end of the range. If you're running a fridge and a freezer together, add their running watts and size the surge to whichever one's starting watts is larger.
If the generator can't supply enough surge to start the compressor, the fridge typically just fails to start (and the generator's own overload protection should trip) rather than damaging the appliance — but repeated failed-start attempts and running a compressor motor on unstable or under-voltage power is not good for its long-term health. See our full explainer on generator-related appliance risk.