About 121.4 hours. A 3,000 Wh power station has roughly 2,550 Wh usable, and a portable 12V fridge averages about 21 W because the compressor cycles on and off. Depending on the model the range is about 60.7 to 173.5 hours.
- Runtime
- 121.4 hEstimate at average draw
- Usable energy
- 2,550 Wh85% of 3,000 Wh
- Average draw
- 21 W50 W while running
- Surge
- NoneNo motor start
The math
| Usable capacity | 3,000 Wh × 0.85 = 2,550 Wh |
|---|---|
| Average draw | 50 W running × 0.42 duty = 21 W |
| Runtime | 2,550 ÷ 21 = 121.4 h |
Other battery sizes
Questions people ask
How long will a 3,000 Wh power station run a portable 12V fridge?
About 121.4 hours (about 5.1 days). A 3,000 Wh power station has roughly 2,550 Wh usable, and a portable 12V fridge averages about 21 W because the compressor cycles on and off. Depending on the model the range is about 60.7 to 173.5 hours.
How many watts does a portable 12V fridge use?
A 12 V compressor fridge/cooler draws about 50 watts while the compressor runs (roughly 35-100 W) and averages about 0.5 kWh a day (around 20 W average) as it cycles in mild weather.
How do you calculate power station runtime?
Hours ≈ capacity in Wh × 0.85 ÷ average watts. The 0.85 allows for inverter and battery losses.