A typical compact dorm-style fridge uses about half a kilowatt-hour a day, which means a 1,000Wh portable power station can keep one cold for roughly a day and a half. That estimate comes from the U.S. government’s ENERGY STAR database. Its certified compact all-refrigerators are rated from about 158 to 283 kWh a year, and compact chest freezers have a median rating of 196 kWh a year. Twelve-volt compressor fridges use much less: Dometic lists its CFX3 35 at 0.98 amp-hours per hour, and EcoFlow rates its GLACIER Classic 35L at 165Wh a day in Eco mode. This guide turns those official figures into runtimes for five power stations, from about 300Wh to 2kWh.
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Where the figures come from: annual energy ratings are from the ENERGY STAR certified refrigerators and certified freezers datasets, as of October 2026. Power station capacities and outputs are from each maker’s specifications. All runtimes below are my estimates, not test results; I explain the math so you can redo it for your own fridge.
Step 1: Find your fridge’s daily energy use
The yellow EnergyGuide label on a U.S. fridge or freezer lists its estimated yearly energy use in kWh. Divide that by 365 and you have watt-hours per day. Here’s how that works out for common mini fridge types in the ENERGY STAR data:
| Appliance type (ENERGY STAR class) | Rated range, kWh/yr | Per day (estimate) |
|---|---|---|
| Compact all-refrigerator, manual defrost (no freezer) | 158–247 | About 430–680Wh |
| Compact all-refrigerator, automatic defrost | 106–283 | About 290–780Wh |
| Compact fridge-freezer, partial automatic defrost | 195–354 | About 530–970Wh |
| Compact chest freezer | 137–226 (median 196) | About 375–620Wh |
| Compact upright freezer, manual defrost | 215–305 | About 590–835Wh |
Two real models show the spread. The Frigidaire EFR176, a 1.6 cu ft fridge with no freezer, is listed at 206 kWh a year, or about 564Wh a day. The Danby DCR032C3, a 3.2 cu ft model with a small freezer section, is listed at 320 kWh a year, about 877Wh a day. The extra freezer compartment is the main reason it uses more.
These ratings come from the Department of Energy’s standard lab test, so your real use will differ. A hot garage, a full door rack opened every hour, or warm groceries all raise it; a cool room lowers it.
Step 2: Compare with a 12V compressor fridge
If you’re buying a fridge for camping or a vehicle, a 12V compressor model is the efficient choice because it skips the power station’s inverter entirely and has thick insulation. Maker figures:
| Fridge | Maker’s figure | Test condition | Per day (estimate) |
|---|---|---|---|
| Dometic CFX3 35 | 0.98 Ah/h | 90°F ambient, 39°F inside | About 282Wh |
| Dometic CFX3 25 | 0.92 Ah/h | 90°F ambient, 39°F inside | About 265Wh |
| EcoFlow GLACIER Classic 35L | 165Wh/24h | 77°F ambient, 39°F inside, Eco mode | 165Wh |
The test conditions differ, so don’t treat those rows as a head-to-head ranking. Even so, a 12V fridge typically needs about half the daily energy of a compact household fridge. For model picks, see our best 12V fridge for a car and best 12V fridge for van life guides.
Step 3: Check that the inverter can start the compressor
Compressors pull a short spike when they start, well above their running watts. The fridge’s running draw is usually small, but the power station’s inverter has to cover that start-up surge. Every station in this guide is rated at 600W or more, which comfortably covers a typical compact fridge’s running draw; if your fridge lists a start-up figure, compare it with the station’s surge rating. Our surge watts vs running watts explainer covers how to check.
Step 4: Do the runtime math
Usable energy is less than the label capacity. I use about 85% for AC appliances, to cover inverter losses and idle draw, and about 90% for 12V DC fridges plugged into the car socket. Runtime in days equals usable watt-hours divided by daily use.
| Power station (capacity) | GLACIER Classic 35L, 165Wh/day (12V) | CFX3 35, ~282Wh/day (12V) | Frigidaire EFR176, ~564Wh/day (AC) | Danby DCR032C3, ~877Wh/day (AC) |
|---|---|---|---|---|
| EcoFlow RIVER 3 Plus (286Wh) | About 1.5 days | About 22 hours | About 10 hours | About 6.5 hours |
| BLUETTI Elite 30 V2 (288Wh) | About 1.5 days | About 22 hours | About 10 hours | About 6.5 hours |
| BLUETTI Elite 100 V2 (1,024Wh) | About 5.5 days | About 3.3 days | About 1.5 days | About 1 day |
| Jackery Explorer 1000 v2 (1,070Wh) | About 5.8 days | About 3.4 days | About 1.6 days | About 1 day |
| BLUETTI Elite 200 V2 (2,048Wh) | About 11 days | About 6.5 days | About 3 days | About 2 days |
All runtimes are estimates from rated figures, not measurements. A compact chest freezer at the ENERGY STAR median (about 537Wh a day) lands close to the Frigidaire column: roughly 1.6 days on a 1kWh station.
The five stations, briefly
EcoFlow RIVER 3 Plus: overnight for a 12V fridge
EcoFlow lists 286Wh of LiFePO4 capacity, 600W AC output with a 1,200W surge, and expansion to 858Wh with an extra battery. On its own, it runs a 12V fridge for about a day and a household mini fridge through one evening. Its small size suits a car camping weekend. See our RIVER 3 Plus review, or find it on Amazon.
BLUETTI Elite 30 V2: same class, more USB-C power
BLUETTI lists 288Wh and 600W AC output. Runtimes are essentially the same as the RIVER 3 Plus. Choose between them on ports and charging; both are best paired with a 12V fridge rather than an AC mini fridge. See it on Amazon.
BLUETTI Elite 100 V2: the 1kWh sweet spot
BLUETTI’s manual lists 1,024Wh and 1,800W AC output. It’s the smallest size that covers a full day for a typical AC mini fridge or several days of 12V fridge use. Our Elite 100 V2 review has the full specs; it’s also on Amazon.
Jackery Explorer 1000 v2: strong surge for compressors
Jackery lists 1,070Wh, 1,500W rated output and a 3,000W surge, which leaves plenty of headroom for compressor start-up. Runtimes are a touch longer than the Elite 100 V2. See it on Amazon, or read our Explorer 1000 v2 solar charging guide.
BLUETTI Elite 200 V2: multi-day outages
BLUETTI lists 2,048Wh and 2,600W continuous AC output. It’s the pick if you want a household mini fridge or freezer to ride out a two- to three-day outage without solar, or a 12V fridge to run for a week or more. See it on Amazon.
Step 5: Add solar to keep it running
To run a fridge indefinitely, you need to replace each day’s energy. Portable panels typically deliver about 70–80% of their rated watts in good sun. Assuming about five hours of strong sun, here’s what each fridge needs:
| Daily use | Panel size to break even (estimate) |
|---|---|
| 165Wh (efficient 12V fridge) | About 50W |
| 282Wh (12V fridge, hot weather) | About 80–100W |
| 564Wh (compact AC fridge) | About 150–200W |
| 877Wh (compact fridge-freezer) | About 250W |
Cloudy days and short winter days can cut that output sharply, so size up if you can. The RIVER 3 Plus and Elite 30 V2 have smaller solar inputs than the 1kWh-plus models, which is another reason to pick a larger station for a fridge.
Ways to stretch runtime
- Pre-chill: cool the fridge and its contents on wall power before switching over.
- Keep it full: full fridges hold cold better; add bottles of water if it’s half empty.
- Open less: each opening lets cold air out and makes the compressor run longer.
- Use DC where you can: a 12V fridge on the car socket avoids inverter losses.
- Find shade: a fridge in a hot car or in the sun works much harder than the rated figures.
- Raise the setpoint a little: 39°F instead of 34°F is still a safe fridge temperature and lowers the load.
FAQ
Can a 300Wh power station run a mini fridge?
Yes, but not for long with an AC mini fridge: roughly 6–10 hours by my estimate, depending on the model. A 12V compressor fridge stretches the same station to about a day.
How many watts does a mini fridge use?
Running draw is usually modest, and it cycles on and off. Daily energy matters more for sizing: about 300–970Wh a day for ENERGY STAR compact models, per their rated annual use.
What size power station do I need for a fridge overnight?
For about 12 hours, a 300Wh station covers most 12V fridges, and a station of roughly 500Wh or more covers a typical compact AC fridge, by my estimate. Check your fridge’s EnergyGuide label for its exact figure.
Is a chest freezer easier to run than an upright?
In the ENERGY STAR data, yes: compact chest freezers have a median rating of 196 kWh a year, while compact manual-defrost uprights run 215–305 kWh.
Do I need a pure sine wave inverter?
Compressor appliances run best on pure sine wave power. BLUETTI’s manuals and EcoFlow’s specs for the models here list pure sine wave output; confirm it on the spec sheet for any other station you consider.
Bottom line
Start with your fridge’s EnergyGuide number and divide by 365. For a 12V fridge on a camping weekend, a 300Wh station like the RIVER 3 Plus or Elite 30 V2 is enough. For a household mini fridge through a day-long outage, a 1kWh station like the Elite 100 V2 or Explorer 1000 v2 fits. For several days, the Elite 200 V2’s 2kWh covers it, and a 200W panel can keep it going.