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What Size Generator to Run a Refrigerator? Watts, Surge, and Picks
A refrigerator by itself needs a generator with about 1,200 starting watts, and a fridge plus a freezer needs about 1,400 starting watts. Honda's wattage guide lists an ENERGY STAR refrigerator or freezer at about 1,200 starting watts and 132 to 192 running watts. So even a small generator can keep a fridge cold. Plan for 3,500 to 4,500 watts if you also want a microwave, a space heater, or other essentials during an outage.
Refrigerator running watts vs starting watts
A fridge compressor pulls a short burst of power each time it kicks on, then settles to a much lower running draw. GE Appliances says start-up amps and watts are usually about 3 times the running amps or watts. Here is what generator makers and fridge spec sheets list:
| Source | Running watts | Starting watts |
|---|---|---|
| Honda wattage guide: refrigerator or freezer (ENERGY STAR) | 132 to 192 W | 1,200 W |
| Champion wattage chart: refrigerator | 150 to 400 W | 800 to 1,200 W |
| Champion wattage chart: freezer | 100 to 500 W | 500 to 1,000 W |
| Frigidaire FFHT1814W (18.3 cu ft top freezer) spec sheet | 3 A at 120V (360 W rated) | Not listed |
| Frigidaire Gallery GRFC2353A (22.6 cu ft French door) spec sheet | 3.3 A at 120V (396 W rated) | Not listed |
Sources: Honda Power Equipment generator wattage estimation guide, Champion Power Equipment generator wattage chart, GE Appliances refrigerator electrical requirements, Frigidaire spec sheets. Rated watts = amps x 120.
Find your own number: the rating plate inside the fridge, or the spec sheet, lists its amps. Multiply by 120 for watts. If you size from that nameplate number, you build in extra margin.
How much electricity does a refrigerator use?
Because the compressor cycles on and off, a fridge uses far less energy than its running watts suggest. ENERGY STAR certified full-size models (7.75 cu ft and up, US market, as of October 2026):
| Type | Models | Typical kWh per year | kWh per day | Average watts |
|---|---|---|---|---|
| Top freezer | 749 | 363 | About 1.0 | About 41 W |
| Bottom freezer (includes French door) | 1,524 | 566 | About 1.6 | About 65 W |
| Side-by-side | 123 | 640 | About 1.8 | About 73 W |
Source: ENERGY STAR Certified Residential Refrigerators data set. Typical = median. Average watts = kWh per year x 1,000 / 8,760 hours.
That low average is why fuel use is small. The generator mostly needs enough headroom to start the compressor.
What size generator do you need? (worked examples)
Add up the running watts of everything, then add the extra starting watts of the one item with the biggest jump. Motors rarely start at the exact same moment. Using Honda's figures (fridge 192 running / 1,200 starting, 1,000 W microwave 1,500 W) and a 1,500 W space heater:
| What you want to run | Running watts | Peak watts | Generator size |
|---|---|---|---|
| Refrigerator only | 192 W | 1,200 W | 1,200+ starting watts |
| Refrigerator + freezer | 384 W | 1,392 W | 1,500+ starting watts |
| Fridge + freezer + 1,000 W microwave | 1,884 W | 2,892 W | 3,000+ starting watts |
| Fridge + freezer + microwave + space heater on high | 3,384 W | 4,392 W | 4,500 running watts |
Peak = running total + (1,200 - 192) for the fridge compressor. An older fridge or garage freezer can draw more (Champion lists up to 400 W running), so leave some room.
Generators that run a refrigerator
In-stock portable generators with room for a fridge, a freezer, and more:
- DuroMax XP5500HX: 5,500 starting / 4,500 running watts on gasoline (4,275 running on propane), CO alert shutoff. Covers every row in the table above. DuroMax lists about 19 hours at 25% load on its 4-gallon tank. $629
- DuroStar DS8000iX: 8,000 starting / 6,500 running watts, inverter power, L14-30R outlet for a transfer switch or interlock kit. Adds room for a furnace blower, sump pump, and more of the house. $999
- DuroMax XP8500EH: 8,500 starting / 7,000 running watts on gasoline, L14-30R outlet, 7.9-gallon tank. $1,075.99
Plug the fridge into the generator with a heavy-duty outdoor extension cord rated for the load, or power it through a transfer switch or interlock kit. Keep the generator outside, away from doors and windows. Not sure which type to get? See inverter generator vs regular generator.
How long will food stay safe without power?
According to FoodSafety.gov, a refrigerator keeps food cold for about 4 hours if the door stays closed. A full freezer holds its temperature for about 48 hours, or 24 hours if it is half full. That is why a fridge is usually the first thing people connect to a generator in an outage.
Can a power station run a fridge instead?
Yes, and quietly. A station needs enough output for the compressor start and enough battery for the hours you need. At the bottom-freezer median of about 1.6 kWh a day (about 65 W average):
| Power station | Capacity / output | Fridge run time | Price |
|---|---|---|---|
| Jackery Explorer 2000 v2 | 2,042 Wh / 2,200 W | About 28 hours | From $899 |
| Jackery HomePower 3000 | 3,072 Wh / 3,600 W (7,200 W surge) | About 43 hours | From $1,349 |
Hours = capacity x 0.9 / 65 W. Capacity, output, and surge are from each product page. Your fridge's own kWh rating changes these numbers. For the full breakdown, read Portable Power Station for a Refrigerator. Going solar? See How Many Solar Panels to Run a Refrigerator?
Backing up more than the kitchen? Read What Size Generator Do You Need to Run a House?
Need help sizing? Call 1-888-855-7286. Send us the amps from your fridge's rating plate and what else you want running, and we will match you to the right generator.
Refrigerator generator FAQ
What size generator do I need to run a refrigerator? About 1,200 starting watts for the fridge alone, based on Honda's guide for an ENERGY STAR fridge. A fridge and freezer together need about 1,400 starting watts.
How many watts does a refrigerator use on a generator? About 132 to 192 watts while running for an ENERGY STAR model, per Honda. Champion lists 150 to 400 running watts, so older or larger fridges draw more.
What size generator do I need for a fridge and freezer? About 1,400 starting watts for the pair. To add a microwave and a space heater, step up to about 4,500 running watts.
Will a 2,000 watt generator run a refrigerator? Yes, for a fridge or a fridge and freezer, as long as you are not running much else.
How long does food last in a fridge without power? About 4 hours with the door closed, according to FoodSafety.gov. A full freezer lasts about 48 hours.