What size power station do I need to run a fridge during an outage?
Short answer (checked October 27, 2026): for a typical full-size fridge, a power station of about 1,000 watt-hours (Wh) with at least 1,500 W of continuous AC output keeps it running for roughly 12 to 22 hours, depending on the fridge type. A typical ENERGY STAR top-freezer model gets about 21 hours from a 1,000 Wh unit. A bottom-freezer or side-by-side gets about 12 to 14 hours. If you want a full day for a big fridge, you need closer to 1,800 to 2,100 Wh.
Before you spend $500 or more, though, check the outage you're actually planning for. For a typical short outage, the right amount of backup for your fridge may be zero. The numbers are below, so you can redo them with your own fridge's label.
Step 1: Do you need backup for the fridge at all?
Two federal numbers do most of the work here.
- Food safety. According to USDA guidance on FoodSafety.gov, a refrigerator keeps food safe for up to 4 hours during an outage if you keep the door closed. A full freezer holds a safe temperature for about 48 hours, or 24 hours if it's half full.
- How long US outages last. The U.S. Energy Information Administration's reliability data shows that in 2024 the average interruption, excluding major storm days, took about 124 minutes (2.1 hours) to restore. Including major events, the average interruption was about 433 minutes (7.2 hours), and the average customer lost power for about 11 hours over the whole year. In 2025 that annual total fell to about 4.5 hours.
So for an everyday outage of a couple of hours, a closed fridge is fine on its own. Backup power for the fridge earns its keep in storm-driven outages that run past that 4-hour line. That's the scenario to size for.
Step 2: Find your fridge's daily energy use
You need one number: kilowatt-hours (kWh) per day.
- Best: look at the yellow EnergyGuide label or look the model up in the ENERGY STAR database. It gives kWh per year. Divide by 365.
- Better still: plug the fridge into a plug-in energy meter for 24 to 48 hours. That captures your kitchen temperature and defrost cycles.
- No label? Use the medians below, from an analysis of the ENERGY STAR certified refrigerator list published by Solar Powered Tech (queried September 26, 2026).
| Fridge type | Median kWh per year | kWh per day | Average draw |
|---|---|---|---|
| Compact | 246 | 0.67 | 28 W |
| Top-freezer | 363 | 0.99 | 41 W |
| Bottom-freezer | 556 | 1.52 | 63 W |
| Side-by-side | 640 | 1.75 | 73 W |
"Average draw" is just kWh per day divided by 24 hours. The compressor actually cycles on and off at a much higher wattage, but over a day it averages out to this. These are certified test figures; a fridge in a hot garage, or one you open a lot, uses more.
Step 3: Turn battery size into runtime
Power stations lose some energy converting battery power to 120 V AC. Jackery's own runtime formula uses a factor of 0.85, meaning about 85% of the rated capacity reaches your appliance:
Runtime (hours) = capacity (Wh) x 0.85 / average draw (W)
Here's that math for two popular 1 kWh class units and a small 300 Wh unit, using the median fridges above.
| Power station | Rated Wh | Usable Wh (x 0.85) | Compact | Top-freezer | Bottom-freezer | Side-by-side |
|---|---|---|---|---|---|---|
| Typical 300 Wh unit | 300 | 255 | 9 h | 6 h | 4 h | 3.5 h |
| EcoFlow DELTA 3 Plus | 1,024 | 870 | 31 h | 21 h | 14 h | 12 h |
| Jackery Explorer 1000 v2 | 1,070 | 910 | 33 h | 22 h | 14 h | 12.5 h |
Capacity figures are from the EcoFlow DELTA 3 Plus and Jackery Explorer 1000 v2 spec pages. Treat the hours as estimates: cold or very hot rooms, battery age and the fridge's defrost cycle all move them.
Working backward: how big for a full day?
Flip the formula: capacity needed = kWh per day / 0.85.
- Top-freezer, 24 hours: 0.99 / 0.85 = about 1,165 Wh
- Bottom-freezer, 24 hours: 1.52 / 0.85 = about 1,790 Wh
- Side-by-side, 24 hours: 1.75 / 0.85 = about 2,060 Wh
- Top-freezer, 3 days: 2.97 / 0.85 = about 3,490 Wh
That last line is why multi-day backup usually means a big expandable unit, solar recharging, or a generator, not one portable box.
Step 4: Check the surge, not just the battery
A fridge compressor pulls a burst of power for a second or two when it starts. If the power station can't supply it, it shuts off or the fridge won't start.
Whirlpool's guidance for refrigeration is to double the running wattage to allow for motor start-up. Find the running figure on the fridge's model/serial tag (amps x volts gives watts).
Example, with an assumed label: a tag showing 6.5 A at 115 V is about 750 W. Doubled, that's about 1,500 W. Both units in the table clear that: the Jackery is rated 1,500 W continuous with 3,000 W surge peak, and the EcoFlow 1,800 W with 3,600 W surge. Small 300 Wh units often have much lower output, so check the spec sheet before counting on one for a full-size fridge.
What it costs per hour of fridge time
Prices move constantly, so here are the ones we found on October 27, 2026:
| Unit | Price found | Usable Wh | Price per usable Wh |
|---|---|---|---|
| Jackery Explorer 1000 v2 | $519 on jackery.com (list $589) | 910 | about $0.57 |
| EcoFlow DELTA 3 Plus | $719, tracked by Compare Power Stations on Oct 20 (shown out of stock on EcoFlow's US page on Oct 27) | 870 | about $0.83 |
Neither number makes one the "better" unit. The EcoFlow has more output and faster solar input (up to 1,000 W across two ports, per EcoFlow); the Jackery is lighter (about 23.8 lb against 27.6 lb). For a fridge alone, the cheaper usable watt-hour is the main thing to compare.
Make the battery last longer
These habits stretch any size of battery:
- Keep the doors shut. Every opening lets cold air out and makes the compressor run.
- Fill empty space with jugs of water. A full freezer holds temperature for about twice as long as a half-full one, per USDA.
- Put a thermometer inside and keep the fridge at 40°F or below, the line USDA uses for food safety.
- Don't run the ice maker or any other extras on battery.
- Plug the fridge directly into the power station with a heavy-duty cord rated for the load. Never backfeed your house through a wall outlet; that endangers line workers and needs a licensed electrician and a proper transfer switch.
- Recharge whenever you can, from a car, solar or a generator running safely outdoors. Jackery quotes 7.5 hours to recharge the 1000 v2 from its 200 W panel in good sun; real conditions are usually slower.
Example scenarios
These are illustrations with stated assumptions, not real households.
A two-person apartment with a top-freezer fridge, outages of 1 to 3 hours. Based on the USDA and EIA numbers above, they likely need no fridge backup at all. A fridge thermometer and keeping the door closed cover it.
A family in a hurricane state with a bottom-freezer fridge and a chest freezer. Planning for a 2-day outage: about 1.52 kWh a day for the fridge is 3.04 kWh, or about 3,580 Wh of rated capacity at 0.85. One 1 kWh unit won't do it. Options: an expandable unit with an extra battery, solar recharging, or a generator to recharge it, while the full freezer rides out the first 48 hours closed.
An RV owner with a compact fridge. 0.67 kWh a day means a 1 kWh class unit covers more than a full day, and a small solar panel can top it up.
When a power station is the wrong answer
- Long, frequent outages where you need the fridge, freezer, well pump and furnace fan together: look at a generator with a transfer switch installed by a licensed electrician.
- Medical devices: Jackery states its power stations are not recommended for medical or life-support equipment. If you rely on powered medical equipment, talk to your supplier and your utility about a backup plan first.
- Short outages only: a thermometer and a closed door are free.
Sources
Checked on October 27, 2026.
- FoodSafety.gov (USDA): Food Safety During Power Outage
- U.S. Energy Information Administration: Table 11.1, Reliability Metrics of U.S. Distribution System (SAIDI and CAIDI, 2015 to 2025)
- Solar Powered Tech: analysis of ENERGY STAR certified refrigerators (median kWh by type, September 26, 2026)
- Jackery Help Center: runtime formula (capacity x 0.85 / watts)
- Jackery: Explorer 1000 v2 product and spec page (capacity, output, price, medical-device note)
- EcoFlow: DELTA 3 Plus product and spec page (capacity, output, solar input)
- Compare Power Stations: EcoFlow DELTA 3 Plus price history
- Whirlpool Product Help: Generator Usage with Appliances (double running watts for refrigeration start-up)
More sizing guides are on our power station sizing page. Found a better number for your fridge? Send it to us.
Quick answers
How long will a 1,000 Wh power station run a refrigerator?
About 21 hours for a typical ENERGY STAR top-freezer fridge that uses 0.99 kWh a day, and about 12 to 14 hours for a typical bottom-freezer or side-by-side model. That assumes 85% of the battery is usable after conversion losses.
How many watts does a power station need to start a fridge?
Whirlpool recommends doubling a refrigerator's running watts to allow for the compressor's start-up surge. Most 1,000 Wh class power stations rated 1,500 W or more continuous cover a household fridge, but check your fridge's label.
Do I need backup power for my fridge at all?
Not for short outages. USDA guidance says a closed refrigerator keeps food safe for up to 4 hours and a full freezer for about 48 hours. The average US interruption outside major storms lasted about 2 hours in 2024, according to EIA data.
Dale Becker is the pen name of The Outage Planner's editorial team. Figures come from the manufacturer specs and public sources linked above and were checked on the date shown. Prices and specs change, so confirm before you buy. Example scenarios are illustrations with stated assumptions, not real households. Some links may be affiliate links that pay us a commission at no extra cost to you.