Disclosure: Some links on this page are affiliate links. If you buy through them, we may earn a commission at no extra cost to you. We haven’t tested these products ourselves. Our recommendations come from manufacturer specs and the math shown on this page.
How Long Will a Power Station Run a 12V Camping Fridge?
Here’s the short answer: a typical 12V compressor fridge uses roughly 15–45 watts on average once it has cooled down, so a 500Wh power station usually runs one for about 10–25 hours. A 1,000Wh station roughly doubles that. Where you land in that range depends on how hot it is, how cold you set the fridge, and whether you use the 12V port or the AC inverter.
This guide walks through the math so you can work out your own number. We haven’t put any of these fridges or stations on a test bench. Everything here comes from published specs and arithmetic, and we show our work so you can check it.
Fridge Draw and Duty Cycle
Two numbers decide how much energy a 12V fridge uses:
- Running draw (watts): the power the compressor pulls while it’s running. Manufacturers usually list this on the spec sheet or the label, in watts or in amps at 12V. Multiply amps by 12 to get watts. For example, 4A × 12V = 48W.
- Duty cycle (%): the share of time the compressor actually runs. A compressor fridge cycles on and off. In mild weather with a closed lid it might run 25–35% of the time. In a hot car it might run 50–70% of the time or more.
Average draw = running draw × duty cycle.
| Running draw | Duty cycle | Average draw | Energy per 24h |
|---|---|---|---|
| 45W | 30% (mild) | 13.5W | ~324Wh |
| 45W | 50% (warm) | 22.5W | ~540Wh |
| 60W | 50% (warm) | 30W | ~720Wh |
| 60W | 70% (hot car) | 42W | ~1,008Wh |
These rows are examples to show how the math works. They aren’t measurements of any specific fridge. Look up your own fridge’s rated draw. Many fridges also publish an “average daily consumption” figure, and when it’s available that beats any estimate.
Thermoelectric coolers are different. A Peltier “cooler” with no compressor often runs non-stop, so its duty cycle is close to 100%. A 50W thermoelectric cooler can use around 1,200Wh a day, which is much more than a compressor fridge. That’s why this guide assumes a compressor fridge.
The Runtime Formula (With a Worked Example)
Runtime (hours) = Battery Wh × Usable fraction × Efficiency ÷ Average draw (W)- Battery Wh: the rated capacity on the manufacturer’s spec sheet.
- Usable fraction: we use 0.9. Stations generally don’t deliver every rated watt-hour, and you’ll rarely run one all the way to 0%.
- Efficiency: about 0.85–0.9 from the 12V car port, or 0.8–0.85 through the AC inverter. These are our planning assumptions, not manufacturer figures. Real losses vary by unit.
Worked example
Say you have a 512Wh station like the Jackery Explorer 500 v2 (Jackery lists 512Wh LiFePO4 capacity and a 12V/10A car port), running a fridge that averages 22.5W in warm weather. The fridge plugs into the 12V port.
- 512Wh × 0.9 usable = 460.8Wh
- 460.8Wh × 0.85 efficiency = ~392Wh delivered
- 392Wh ÷ 22.5W = ~17 hours
On the AC inverter instead (0.80 efficiency): 512 × 0.9 × 0.8 ÷ 22.5 = ~16 hours. The inverter also has its own idle draw (covered below), so the real-world gap is usually bigger than this.
DIY calculator
Copy this into any spreadsheet:
| Cell | Value |
|---|---|
| A1 | Battery Wh (e.g., 512) |
| A2 | Fridge running watts (e.g., 45) |
| A3 | Duty cycle as decimal (e.g., 0.5) |
| A4 | Efficiency (0.85 for 12V, 0.8 for AC) |
| A5 | =A1*0.9*A4/(A2*A3) → runtime in hours |
Runtime Table: 300Wh, 500Wh, 1000Wh, 2000Wh
Assumptions: 0.9 usable fraction, 0.85 efficiency (12V port), rounded down.
| Station size | 15W avg (cool, efficient) | 22.5W avg (typical warm) | 30W avg (hot) | 42W avg (very hot) |
|---|---|---|---|---|
| 300Wh | ~15 h | ~10 h | ~7.5 h | ~5 h |
| 500Wh | ~25 h | ~17 h | ~12.5 h | ~9 h |
| 1,000Wh | ~51 h | ~34 h | ~25 h | ~18 h |
| 2,000Wh | ~102 h | ~68 h | ~51 h | ~36 h |
Some real stations close to each size, with capacity as listed by the manufacturer:
| Size class | Example model | Rated capacity | Source |
|---|---|---|---|
| ~300Wh | EcoFlow RIVER 3 Plus | 286Wh | EcoFlow US spec page |
| ~300Wh | Jackery Explorer 300 v2 | 288Wh | Jackery spec page |
| ~500Wh | Goal Zero Yeti 500 | 499.2Wh | Goal Zero spec page |
| ~500Wh | Jackery Explorer 500 v2 | 512Wh | Jackery spec page |
| ~1,000Wh | EcoFlow DELTA 3 Classic | 1,024Wh | EcoFlow US listing |
| ~2,000Wh | EcoFlow DELTA 3 Max | 2,048Wh | EcoFlow US listing |
Check price: EcoFlow RIVER 3 Plus (affiliate link TODO) · Check price: Jackery Explorer 500 v2 (affiliate link TODO) · Check price: Goal Zero Yeti 500 (affiliate link TODO) · Check price: EcoFlow DELTA 3 Classic (affiliate link TODO)
What Changes Runtime
Heat
Heat matters most. When it’s hot outside, the compressor runs longer to hold the same set temperature. Parking in the shade, cracking a window (only where it’s safe and legal), pre-chilling the fridge and food at home, and opening the lid less can all shorten the duty cycle. Setting the fridge to 38°F instead of 32°F also helps.
The station is affected too. Batteries and electronics do best in moderate temperatures. EcoFlow, for example, lists an optimal operating range of 68–86°F for the RIVER 3 Plus. Don’t leave a station baking in a closed car on a summer afternoon.
Inverter loss and idle draw
Plugging a 12V fridge into the AC outlet through its AC adapter means converting power twice: DC to AC inside the station, then AC back to DC in the fridge’s adapter. Each step loses energy. The inverter also uses power just by being switched on. As one data point, Jackery’s own FAQ lists 12W standby power consumption for the Explorer 500 v2. Running a 12W idle load all day would cost about 288Wh, which could be more than the fridge itself uses. Use the 12V DC port whenever your fridge supports it, and turn off AC output when you aren’t using it.
Watch the 12V port rating
Make sure the station’s 12V port can handle your fridge’s peak draw. Jackery lists 12V/10A (about 120W) on the Explorer 300 v2 and 500 v2. Goal Zero lists 162W continuous on the Yeti 500’s 12V auxiliary port. Most compressor fridges fit well within those limits, but check your fridge’s startup current in its manual.
Low-voltage cutoffs
Many fridges have battery-protection settings (low/medium/high) meant for car batteries. A power station’s regulated 12V output normally holds a steady voltage, so these settings rarely trigger. Even so, if your fridge shuts off early, check them.
Battery age
Rated cycle life describes capacity fading over time. Jackery, for example, rates the 500 v2 at 6,000 cycles to at least 70% capacity. An older station holds less, so plan with some buffer.
Recharging With Solar
Solar is how you go beyond a weekend. The goal is simple: put back at least what the fridge uses each day.
If your fridge averages 22.5W, it uses about 540Wh a day. To replace that:
Panel watts needed ≈ Daily Wh ÷ (Peak sun hours × 0.7)The 0.7 factor is our conservative allowance for panel angle, heat, wiring, and charge-controller losses. With 5 peak sun hours, that’s 540 ÷ (5 × 0.7) ≈ 155W of panel. In practice that means a 160–200W folding panel, plugged into a station whose solar input can accept it.
Check the solar input limit on the station’s spec sheet:
| Station | Max solar input (manufacturer spec) |
|---|---|
| EcoFlow RIVER 3 Plus | 220W |
| Jackery Explorer 500 v2 | 200W (16–60V, 10.5A) |
| Goal Zero Yeti 500 | 200W (12.3–28V, 10A, 8mm port) |
| Jackery Explorer 300 v2 | 100W via USB-C (per spec sheet) |
For the full solar math, see our guide: What Size Solar Panel Do I Need to Recharge a 500Wh Power Station in One Day?
FAQ
Will a 300Wh station run a 12V fridge overnight? Usually, yes. Using our assumptions, a fridge averaging 15–30W would run about 7.5–15 hours. Start with a pre-chilled fridge and use the 12V port.
Is it better to plug my fridge into 12V or AC? Use 12V whenever possible. It skips the inverter’s conversion losses and idle draw.
How do I find my fridge’s real average draw? Many stations show live input and output watts on the display. Watch the output over a few hours, or better, divide the station’s percentage drop over 24 hours by 100 and multiply by its capacity. That gives you a daily figure for your own conditions.
Can I run the fridge while the station charges from solar? Many stations support pass-through charging. Goal Zero, for example, lists simultaneous recharge and discharge for the Yeti 500. Check your model’s manual.
Why does my runtime fall short of the table? Most often it’s hot weather, AC inverter idle draw, a lot of lid opening, or a warm fridge loaded with warm food. The table is an estimate from specs and assumptions, not a measured result.