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Can a portable power station run a refrigerator?
Yes, as long as it can handle the start-up surge. A full-size fridge runs at about 100–250 W but needs roughly 1,000–1,500 W for a second each time the compressor starts, so look for a surge (peak) rating of at least 1,200 W. A typical modern fridge uses 1–1.5 kWh a day, which means a 1,000 Wh power station keeps it going for about 14–20 hours. Older fridges, hot kitchens and frequent door opening can cut that by half.
Run time by power station size
A fridge doesn't draw power all the time. The compressor switches on and off to hold the temperature, so what matters for run time is its average draw over a day. We use 85% of the rated capacity, because the inverter that makes household AC power loses some energy as heat.
| Fridge | Uses per day | 500 Wh | 1,000 Wh | 2,000 Wh | 3,000 Wh |
|---|---|---|---|---|---|
| Mini fridge | ~0.6 kWh | 17 h | 34 h | 2.8 days | 4.3 days |
| Efficient full-size (Energy Star, under 10 years old) | ~1.0 kWh | 10 h | 20 h | 40 h | 2.5 days |
| Typical full-size | ~1.4 kWh | 7 h | 14 h | 28 h | 42 h |
| Older or large side-by-side | ~2.2 kWh | 4.6 h | 9 h | 18 h | 28 h |
How we got these: run time = capacity × 0.85 ÷ average watts. A fridge using 1.4 kWh a day averages about 60 W, so a 1,000 Wh unit gives 850 ÷ 60 ≈ 14 hours. These are estimates from typical figures, not measurements of specific fridges. Your fridge could use noticeably more or less.
Find your own fridge's numbers
You don't need to guess. There are two easy ways to get a better figure than our table.
1. The yellow EnergyGuide label
Fridges sold in the US come with a yellow EnergyGuide label that lists estimated yearly use in kWh. It is often still inside the fridge door or in the manual, and you can look it up online by model number.
Wh per day = kWh per year × 1,000 ÷ 365
Example: a label that says 500 kWh/year works out to about 1,370 Wh a day, or an average of 57 W.
2. A plug-in power meter
A plug-in electricity meter costs around $20. Plug the fridge into it for 24 hours and read the kWh. This is the most accurate number you can get, because it includes your kitchen temperature and how often your household opens the door.
Don't use the watts or amps printed on the fridge's rating plate to work out run time. That figure is the maximum the fridge can draw (often including a defrost heater), not what it uses on average. Volts × amps from the plate gives a number far higher than real use.
The surge problem
This is where most fridge-and-power-station setups fail. When the compressor starts, it pulls several times its running power for a fraction of a second. If the power station can't supply that peak, it shuts off, often with an overload light, even though the fridge would only need 150 W a moment later.
- Standard compressor fridges: plan for a surge of about 1,000–1,500 W. A unit rated "1,000 W continuous / 2,000 W surge" handles almost any household fridge.
- Inverter (variable-speed) compressor fridges: these start gently and need much less surge. Many newer models from large brands use them; the spec sheet or manual will say "inverter compressor".
- Other things plugged in: the surge needs to cover the fridge starting while everything else is already running. The calculator adds this up for you.
Also check that the power station puts out a pure sine wave. Almost all current lithium power stations do, but compressors run hot and noisy on the cheaper "modified sine wave" output.
Keeping food safe in an outage
According to the USDA, a fridge keeps food safe for about 4 hours without power if you keep the door closed. A full freezer holds its temperature for about 48 hours, a half-full one for about 24 hours. The fridge should stay at 40 °F (4 °C) or below.
That gives you some room to stretch a smaller power station:
- Keep the door shut. Every opening lets cold air out and makes the compressor run longer.
- Put a thermometer inside. It's the only way to know the food is still safe, whatever the power station's display says.
- Unplug other loads. Ice makers and door heaters on some models add to the draw; turn them off if your fridge allows it.
- Prioritise. If capacity is tight, a chest freezer full of food is worth more per watt-hour than a half-empty fridge.
Running a fridge on solar
To keep a fridge going for days, you need to put back what it uses each day. With 4 peak sun hours and panels delivering about 75% of their rating:
Panel watts ≈ Wh per day ÷ (4 × 0.75)
A typical fridge at 1,440 Wh a day needs roughly 480 W of panels. Check that your power station's solar input can take that much: many mid-size units accept 400–800 W. In winter, or on cloudy days, expect half the output or less.
Running more than the fridge? Add your router, lights or a CPAP and see the size you need.
Open the calculatorFAQ
Can a 500 Wh power station run a refrigerator?
For a few hours, if its surge rating can start the compressor. A typical full-size fridge averages about 60 W, so 500 Wh (about 425 Wh usable) lasts roughly 7 hours. Many 500 Wh units only surge to about 1,000 W, which may not be enough to start an older fridge.
Do I need a pure sine wave power station for a fridge?
Yes. Almost all current lithium power stations are pure sine wave, but check the spec sheet, especially on very cheap units.
How many solar panels keep a fridge running?
About 480 W of panels for a typical fridge using 1,440 Wh a day, with 4 peak sun hours. More in winter or cloudy weather.
Is it safe to run a power station indoors?
A battery power station gives off no exhaust, so it can be used indoors. A gas generator can't: it must stay outside because of carbon monoxide. Keep the power station ventilated and away from water.
What's the difference between W and Wh here?
The fridge's watts decide whether the power station can run it at all. The power station's watt-hours decide how long. Watts vs watt-hours, explained.
How we worked this out: run times are calculated from typical refrigerator energy use and an 85% usable-capacity assumption, not measured on specific products. Food-safety times are from the USDA's guidance on power outages.