The refrigerator is almost always the first thing people want to keep running during a power outage. Here's the exact wattage you need — and what size generator actually handles the compressor's starting surge.
Keeping food safe during an outage means keeping the refrigerator and freezer running. The good news: refrigerators are not heavy power consumers while running. The catch: the compressor motor needs a burst of starting power that's 4–7× the running wattage every time it cycles on. That's the number that determines your minimum generator size.
💡 Running more than just the fridge? Use our free generator size calculator to add all your appliances and get a precise total recommendation.
Wattage varies significantly by refrigerator type, age, and size. Older units (pre-2010) use considerably more energy than modern Energy Star models. Here are typical figures:
| Refrigerator Type | Running Watts | Starting Watts (Surge) |
|---|---|---|
| Top-freezer, 14–18 cu ft | 100–150 W | 700–1,000 W |
| Top-freezer, 18–22 cu ft | 150–200 W | 800–1,200 W |
| Bottom-freezer, 18–22 cu ft | 150–200 W | 900–1,300 W |
| Side-by-side, 22–28 cu ft | 200–300 W | 1,000–1,500 W |
| French door, 24–28 cu ft | 150–250 W | 900–1,400 W |
| Mini-fridge (compact) | 50–100 W | 200–400 W |
| Chest freezer (5–10 cu ft) | 75–100 W | 400–600 W |
| Upright freezer (14–20 cu ft) | 100–150 W | 500–800 W |
| Older fridge (pre-2010) | 200–400 W | 1,200–2,000 W |
How to find your exact number: Check the yellow EnergyGuide sticker on your fridge door or the nameplate inside the unit. Look for amps and volts — multiply them (amps × 120V = running watts). The starting surge is typically 4–7× the running wattage for older compressors, or 3–5× for newer inverter compressors.
A full-size modern refrigerator's compressor typically surges to 800–1,200W for 2–3 seconds when it starts. Here's what that means for generator sizing:
A 2,000W inverter generator (typically 2,200W surge) safely starts and runs a standard full-size refrigerator, with enough headroom for lights, phone chargers, and a small TV. This is the bare minimum for fridge-only backup. The Honda EU2200i and Champion 2500W are popular choices.
A 3,500W generator handles the refrigerator, a separate chest freezer, lights, fans, chargers, and TV all running simultaneously — even when the compressors cycle on together. This is the practical sweet spot for kitchen-focused outage backup.
Important: If you also need a window AC, well pump, or sump pump, the refrigerator adds ~150–200W of running load and ~1,200W of peak demand on top of those larger motor loads. Use our calculator to add them all up.
During a power outage, you don't need to run the generator continuously. A properly functioning refrigerator will maintain safe temperatures for:
This means you can run the generator for 2–3 hours to cool everything down, shut it off for 3–4 hours, then run it again — stretching a tank of gas across a much longer outage. The USDA's rule: above 40°F for more than 2 hours = discard perishable food.
A chest or upright freezer that's packed full retains its temperature longest because the frozen food acts as thermal mass. Keep the doors closed and minimize openings during an outage.
Handles the refrigerator, chargers, and basic lights. Quiet, lightweight, and fuel-efficient. Perfect if the fridge is your only priority.
→ Browse 2,000W Inverter Generators on Amazon
Runs refrigerator + freezer + lights + TV + chargers with comfort. A great balance of cost, power, and portability for most homeowners.
→ Browse 3,500W Portable Generators on Amazon
The refrigerator becomes a minor load when you're also running an AC, sump pump, and other appliances. A 5,000W generator covers everything with room to spare.
Not reliably. Most full-size refrigerators need 800–1,200W to start their compressor. A 1,000W generator has maybe 1,200–1,300W of surge capacity — barely enough, and there's zero margin for anything else running. A compressor that cycles on while the generator is under any other load will trip the overload. Use a 2,000W generator as your minimum for a refrigerator.
Most modern full-size refrigerators use 100–300 watts running, but their compressors draw 700–1,500 watts for 2–3 seconds every time they start. Annual energy use is typically 300–800 kWh/year for modern models (check the yellow EnergyGuide sticker for the exact figure, then divide by 8,760 to get average hourly watts).
Yes — use a heavy-gauge outdoor extension cord (12 AWG minimum for runs under 25 feet; 10 AWG for 25–100 feet). Plug the fridge's standard 3-prong plug into the generator's 120V outlet. Alternatively, a transfer switch lets you power hardwired kitchen circuits directly from the generator without any extension cords.
Modern refrigerators with electronic control boards and variable-speed (inverter) compressors run better and more safely on the clean power from an inverter generator (pure sine wave). Older refrigerators with simple compressor motors generally tolerate the modified sine wave from conventional generators fine. When in doubt — especially for newer French door and smart fridges — use an inverter generator.
Add your appliances for an exact running + starting watt recommendation.
Running and starting watts for refrigerators, freezers, and 40+ other appliances.
What to prioritize when the grid goes down, and full outage prep sizing.
Full home load breakdown including refrigerator, AC, and pumps.