What Size Solar Generator Runs a Refrigerator and Freezer?

A solar generator needs about 1,500 Wh of battery to run a typical full-size refrigerator for 24 hours, and about 2,900 Wh to add an upright freezer. Those figures use ENERGY STAR median ratings plus 15% inverter losses. The unit’s surge rating must also cover the compressor’s startup spike, which EcoFlow puts at several times running watts.

How much energy do a fridge and freezer use?

Less than their nameplates suggest. A U.S. Department of Energy lesson explains that a refrigerator only draws its rated wattage while the compressor runs, and the compressor cycles on and off. The yellow EnergyGuide label’s annual kWh is the better number to size from.

We pulled the ENERGY STAR certified refrigerator and freezer datasets in September 2026 and took the median rating for each type.

Appliance (ENERGY STAR median)	Models in dataset	kWh per year	Wh per day	Average watts
Full-size refrigerator (all types)	2,963	457	about 1,252	about 52
Top-freezer refrigerator	832	363	about 995	about 41
Side-by-side refrigerator	123	640	about 1,753	about 73
Upright freezer	497	438	about 1,200	about 50
Chest freezer	9	218	about 597	about 25
Compact freezer	162	244	about 668	about 28

The chest freezer figure rests on only nine certified models, so treat it as a rough guide. Your own label is always better than a median.

What size solar generator runs a refrigerator and freezer?

Add the daily watt-hours, then divide by 0.85. EcoFlow’s runtime guide suggests multiplying battery capacity by 0.80 to 0.90 for AC loads, and 0.85 is the middle.

Setup (24 hours)	Wh per day	Battery needed (÷ 0.85)	Size class
Full-size fridge	about 1,252	about 1,470 Wh	2 kWh class
Fridge plus chest freezer	about 1,849	about 2,180 Wh	2 kWh class, near the limit
Fridge plus upright freezer	about 2,452	about 2,880 Wh	3 kWh class
Side-by-side fridge plus upright freezer	about 2,953	about 3,470 Wh	3 to 4 kWh class

A 1 kWh class unit still helps. With about 870 usable Wh from 1,024 Wh, it runs a median full-size fridge for about 17 hours. See what a 1000Wh solar generator can run for the full table.

Why startup surge matters

Every time the compressor starts, it pulls a short spike. EcoFlow’s refrigerator guide says a fridge may need 2 to 3 times its usual power to start. Its surge power guide lists refrigerators and freezers at 3 to 5 times running watts, for a few seconds.

The two EcoFlow articles disagree, so size for the higher figure if your fridge is older or large. Compare the result with the unit’s surge or peak rating, not its rated output. If both a fridge and a freezer are plugged in, their compressors can start at the same moment.

How many solar panels do you need to run a refrigerator?

Enough to put back what the fridge takes out each day. The method has three steps.

1. Daily battery energy: about 1,470 Wh for a median full-size fridge (from the table above).
2. Peak sun hours for your location and month: the daily solar energy per square meter, in kWh/m²/day. NLR’s PVWatts calculator reports this as “solar radiation” for any US address.
3. Panel watts = daily battery energy ÷ (peak sun hours x 0.86). The 0.86 is our allowance for real-world losses; we entered 14% system losses in PVWatts.

Here is what that gives for a fixed panel tilted 30° to the south, using PVWatts version 8 data we pulled on September 26, 2026. Portable panels laid flat or poorly aimed will collect less.

Location	Peak sun hours, annual	Peak sun hours, December	Panel watts for one fridge, annual average	Panel watts for one fridge, December
Phoenix, AZ	6.60	5.30	about 260 W	about 320 W
Houston, TX	5.16	3.76	about 330 W	about 460 W
Chicago, IL	4.55	2.43	about 380 W	about 710 W
Seattle, WA	3.99	1.47	about 430 W	about 1,170 W

Add an upright freezer and the battery target rises to about 2,880 Wh, so multiply those panel figures by about 1.96. In Chicago in December, that is roughly 1,380 W of panels.

Check the solar input limit

Panels above a unit’s limit will not charge it faster. Listed maximums vary widely: 500 W on the BLUETTI AC180, 600 W on the Anker SOLIX C1000 Gen 2 and 1,000 W on the Jackery HomePower 3000. A winter fridge-and-freezer setup in the northern US can exceed what a mid-size unit accepts.

Solar generators sized for a fridge

Browse current portable power stations on eBay, new condition only, from $200.

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• 1000Wh and up
• LiFePO4
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Tips to stretch fridge runtime

• Start cold and keep doors shut. Fewer openings mean fewer compressor cycles.
• Use your own label. An older or larger fridge can use far more than the median.
• Charge during the day, run overnight. Solar input while the fridge runs reduces the battery you need.
• Consider a separate chest freezer. By the ENERGY STAR medians, chest models use about half the energy of upright ones.

Related guides

For a full outage plan beyond the kitchen, read our solar generator home backup guide. Bigger units and two-fridge setups are covered in what a 3000 watt solar generator will run. To compare brands and sizes, start with our best solar generators guide.