By Nicholas · Published September 25, 2026
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Check the startup load first
A refrigerator compressor briefly draws more power when starting than while running. The power station's continuous AC rating must support the running load, and its documented surge behavior must support the startup event. Manufacturer labels and manuals are a starting point; if the information is unclear, ask the appliance or station maker rather than assuming that two similar-looking refrigerators draw the same amount.
Some power stations advertise a special high-wattage mode that reduces output voltage to accommodate certain loads. Do not assume that mode will safely run your compressor: check the exact appliance and station guidance.
Estimate the energy needed until morning
Fridges cycle on and off. Their instant running wattage is not the same as their average draw across eight or twelve hours. A plug-in energy monitor, used according to its instructions, can measure watt-hours over a representative day. Divide the measured watt-hours by the measurement hours to get average watts, then multiply by the backup hours you need.
| Example only | Calculation | Meaning |
|---|---|---|
| Measured 1,200 Wh in 24 hours | 1,200 ÷ 24 = 50 W average | The average includes compressor-off periods. |
| 12-hour overnight plan | 50 × 12 = 600 Wh at the refrigerator | This is energy delivered to the appliance, not the battery's advertised capacity. |
| Illustrative 80% planning factor | 600 ÷ 0.8 = 750 Wh rated battery capacity | A planning example, not a guaranteed efficiency or a product recommendation. |
Hot rooms, frequent door openings, food just loaded into the fridge, inverter overhead, battery age and other connected devices can change the result. Leave more margin if losing refrigeration would be costly. Our adjustable runtime calculator lets you enter your own load and planning factor.
What if you don't have a power meter?
An EnergyGuide or manufacturer annual-use figure can provide a rough average: annual kilowatt-hours × 1,000 ÷ 8,760 hours. That annual average is not a promise for a hot summer night, and it does not tell you the startup surge. Treat it as an early sizing screen, then verify the actual setup before relying on it in an outage.
Choose the buying path
Battery power station
Compare AC continuous and surge output, usable watt-hours, charging time and an expansion option. The attraction is operation without combustion exhaust at the appliance; the constraint is a finite battery that must be recharged.
Outdoor fuel generator
Compare rated running and starting watts, fuel availability and the safe connection plan. A generator can support a longer outage if fuel is available, but it cannot be used inside, in a garage, or near the house. Start with our generator sizing guide.
Before you depend on the setup
- Confirm the fridge starts and runs from the exact station under a safe, supervised test.
- Measure the actual energy consumed over enough time to see normal cycling.
- Account for every other connected load and the station's own operating overhead.
- Plan how the station will be recharged if the outage extends beyond one night.
- Follow appliance food-safety guidance in an outage; a runtime estimate cannot establish safe food temperature.
For the full battery-sizing method, read What Size Portable Power Station Do You Need? For other outage loads, read How Much Generator Do You Need?
Safety references: CDC carbon monoxide and generator guidance · Wheatland Electric generator connection guidance. The calculation examples above are illustrative arithmetic, not measured product performance. This guide does not claim hands-on testing.