How long will a power station run a refrigerator?
Short answer: a typical full-size fridge averages about 60 watts, because its compressor runs only part of the time. On our estimate a 1,000–1,150Wh power station keeps it running for about 12–13 hours. To cover a full 24 hours, look for about 2,100Wh on the box — a 2,000Wh-class station only just falls short, so add an expansion battery or plan to recharge.
Step 1: get your fridge’s real number
Most runtime claims online start from a guess. You can do better in a minute: find the yellow EnergyGuide label (often inside the door or in the manual, or on the model’s listing). It shows estimated yearly energy use in kWh. Divide by 8.76 to get the fridge’s average power in watts.
| Label (kWh/year) | Average watts | Per day |
|---|---|---|
| 350 (small or very efficient) | 40 W | about 0.96 kWh |
| 500 (close to our default fridge) | 57 W | about 1.4 kWh |
| 650 (large French-door) | 74 W | about 1.8 kWh |
| 800 (older or very large) | 91 W | about 2.2 kWh |
The label is measured in a lab with the doors closed, so treat it as a starting point: a fridge in a hot room, or one you open often, uses more. In the planner, open “Fine-tune the numbers” and type your label’s kWh into the refrigerator row — every result updates.
Our default fridge is 150W while the compressor runs, running about 40% of the time: about 60W on average, or 1.4 kWh a day. An energy-estimating method published by Virginia Cooperative Extension assumes fridges run about a third of the time, so 40% leans cautious.
Step 2: from your fridge to a battery size
A power station never delivers all of the energy on its box. Turning battery power into household AC power costs energy, and the inverter draws some power just to stay on — which matters more at small loads like a fridge. Independent tests published by Outdoor Life found stations delivered 76–92% of their rated capacity at a 380W load, but only 49–77% at about 34W. We estimate about 76.3% efficiency for a 60W fridge, and keep 10% of the battery in reserve.
| Outage | Energy the fridge uses | Look for at least |
|---|---|---|
| 8 hours (overnight) | 480 Wh | 700 Wh |
| 12 hours | 720 Wh | 1,050 Wh |
| 24 hours | 1,440 Wh | 2,100 Wh |
What that means for real stations, on the same assumptions:
- 768Wh (RIVER 2 Pro): about 8.8 hours — an overnight bridge.
- 1,024–1,152Wh (DELTA 2, SOLIX C1000, Explorer 1000 v2, AC180, R1500): about 11.7–13.2 hours.
- 2,048Wh (DELTA 2 Max, AC200L): about 23.4 hours — nearly a full day.
Add Wi-Fi and a few LED lights and the load nearly doubles: a 1kWh station then lasts about 7 hours, and you need the 2kWh class to get through 12. The station comparison shows each combination.
Step 3: check the start-up surge
A compressor draws a brief spike when it starts — several times its running power, for a fraction of a second. A station has to handle that spike every time the compressor cycles on, all night. If it can’t, the station shuts off or the compressor won’t start.
We assume an 800W spike for a typical fridge. That’s a cautious estimate, not a measurement: start-up draw varies by model and age, and older or larger fridges can need more. Every station we cover is rated for at least 1,200W of surge, so a typical fridge starts on any of them — but a big older fridge plus other appliances on a small station is where trouble starts. If you know your fridge’s start-up watts (a plug-in meter with a peak reading will show it), enter them in the planner.
Ignore “boost” numbers when checking surge. EcoFlow’s X-Boost, BLUETTI’s Power Lifting and similar modes let heating appliances run at reduced power; they don’t help a compressor start. Each station page separates the two.
Keep food safe while the power is out
Federal food-safety guidance (FoodSafety.gov) is the backstop for any battery plan:
- A closed refrigerator keeps food safe for up to 4 hours without power.
- A full freezer holds its temperature for about 48 hours (24 hours if half full) if the door stays closed.
- Throw out perishable food (meat, dairy, leftovers) that has been above 40°F for 2 hours or more. Keep an appliance thermometer in the fridge so you know.
That guidance suggests a useful strategy for a smaller station: you don’t have to run the fridge continuously. Running it for a few hours, then leaving it closed for a few, stretches a 1kWh battery across a longer outage — as long as you watch the thermometer.
- Before outage season: fully charge the station and test it with the fridge for a few hours while the grid is up.
- During the outage: keep doors shut, plug the fridge directly into the station (avoid long thin extension cords), and leave the station somewhere ventilated, not in a closed cabinet.
- Never run a fuel generator indoors, in a garage or near windows to keep the fridge going — the CDC says generators belong outside, at least 20 feet from doors, windows and vents.
Try it with your fridge
The planner, set up for a fridge, shows every station’s runtime, the time of night it would run out, and why any station falls short. For a CPAP as well, read the CPAP guide; in an apartment, start with the apartment guide. If the outage stretches past a day, you’ll need to put energy back while the fridge runs — see how to recharge a power station from solar, a car or a generator.
Sources
- FoodSafety.gov: Food safety during a power outage — 4-hour fridge, 48/24-hour freezer, 40°F rule
- Beko US: How to read a refrigerator’s EnergyGuide label — the label’s “Estimated Yearly Electricity Use (kWh/year)” field
- Virginia Cooperative Extension: estimating appliance energy use — refrigerators run about one-third of the time
- Outdoor Life: best portable power stations (Jan 2026) — independent tests: delivered energy vs. load
- CDC: Preventing carbon monoxide poisoning — generators outdoors, 20 ft from openings