How long will a power station run a fridge?
A fridge's compressor runs only about a third of the time, so it averages roughly 60 W — a power station runs one far longer than its 180 W nameplate suggests.
The wattage on a fridge is its running draw, not its average. Because the compressor cycles on and off, the number that actually drains your battery is much smaller. Here's the honest math, worked on real models.
Why a fridge sips instead of guzzles
A refrigerator’s compressor doesn’t run constantly — it cycles on to pull the temperature down, then shuts off. Over an hour it’s only drawing power maybe a third of the time, so its average wattage is far below its running wattage.
These are our sourced device figures — the same ones the sizing tool uses. “Avg while cycling” is the running draw multiplied by the duty cycle (the fraction of time the compressor is actually on), and it’s the number that drains a battery.
| Appliance | Running draw | Startup surge | Avg while cycling | Source |
|---|---|---|---|---|
| Refrigerator (full-size) | 180 W | 1,200 W | ~63 W | 2026-07-06 |
| Chest freezer | 100 W | 700 W | ~30 W | 2026-07-06 |
The runtime math, on real stations
Runtime is usable watt-hours divided by average draw, minus a little for inverter conversion loss. Using our published AC efficiency (85%) and the ~63 W fridge average above, here’s roughly how long each unit holds a full-size fridge.
| Model | Usable capacity | Est. fridge runtime |
|---|---|---|
| EcoFlow DELTA 3 | 1,024 Wh | ~14 hr |
| Anker SOLIX C1000 Gen 2 | 1,024 Wh | ~14 hr |
| Bluetti Elite 200 v2 | 2,074 Wh | ~28 hr |
| Jackery Explorer 2000 v2 | 2,042 Wh | ~28 hr |
These are round estimates to show the shape of it — a warm garage, a stuffed freezer compartment, or frequent door openings all push the average draw up. For a number tuned to your fridge and how many hours or days you need to cover, run the sizing tool, which uses the same physics with your inputs.
Startup surge: the number that trips cheap inverters
A compressor pulls a brief inrush spike several times its running wattage when it starts. If the inverter’s surge rating can’t cover that spike, it trips — and the fridge never starts, no matter how big the battery is.
Comfortably runs a fridge
- ~1 kWh+ usable capacity for overnight, ~2 kWh for a full day
- Inverter surge rating clears the compressor's startup spike
- Pure sine wave output (protects the compressor motor)
- Room to also run Wi-Fi, a light, and phone charging
Will struggle
- Sub-500 Wh units: only a few hours of fridge time
- Low surge rating trips when the compressor kicks on
- No headroom left for anything besides the fridge
- Modified sine wave (can buzz or stress the motor)
The models above are drawn from our best power stations for home backup list — every one ranked on sourced capacity and output, with the fair-price verdict shown on each model page.
Frequently asked questions
- How long will a power station run a refrigerator?
- Longer than the wattage implies, because a fridge's compressor only runs about a third of the time. A typical full-size fridge draws ~180 W while the compressor is on but averages closer to ~60 W over an hour. On roughly 1 kWh of usable capacity that's about 13–15 hours; on a 2 kWh unit, over a day. Exact runtime depends on your fridge, the ambient heat, and how often the door opens.
- What size power station do I need to run a fridge during an outage?
- For overnight coverage of a full-size fridge, aim for at least ~1 kWh of usable capacity and an inverter of 800 W or more (to clear the compressor's startup surge). For a full day or to also run a few lights and Wi-Fi, step up to a 2 kWh-class unit. Size it to your actual fridge and outage length with our sizing tool.
- Why does a fridge need a big surge rating?
- The compressor motor draws a brief inrush spike several times its running wattage when it kicks on — a ~180 W fridge can momentarily pull ~1,200 W. If the inverter's surge rating can't cover that spike, it trips and the fridge never starts, even though the running wattage is small. This is why the surge number matters more than the running number for anything with a motor.
- Can I run a chest freezer on a power station too?
- Yes, and often longer than a fridge — a chest freezer is well-insulated and cycles less, averaging roughly 30 W over an hour. The startup surge is lower than a fridge's, so inverter surge is rarely the limiter. The same capacity math applies: usable watt-hours divided by average draw.
- Does opening the fridge door change how long the battery lasts?
- It does — every door opening lets cold air out, so the compressor runs more and the average draw climbs. During an outage, keep the door shut as much as possible; a full fridge also holds temperature longer than an empty one, which stretches your runtime.