How Long Will the EcoFlow River 3 Run a 12V Car Fridge?
Updated 2026-10-17 · Yes
The numbers
| Battery capacity | 245Wh (LFP) |
|---|---|
| Usable energy | 225Wh (92% via 12V/USB DC output) |
| Continuous AC output | 300W |
| Surge rating | 600W |
| 12V car fridge running watts | 45W |
| Startup watts | 60W |
| Average draw | 18W |
| Estimated runtime | 13 hours |
| Energy per day of typical use | 432Wh |
245Wh × 0.92 = 225Wh usable ÷ 18W average = 12.5 hours
Station specs: source, checked 2026-10-17. See how we calculate runtime.
Adjust the numbers
Check the label on your 12V car fridge and enter its real wattage.
Recharging with solar
The EcoFlow River 3 accepts up to 110W of solar input. In real conditions that harvests about 413Wh on a sunny day (5 peak-sun hours).
Solar can’t fully keep up. A 12V car fridge uses about 432Wh a day at 24 hours of use, more than the EcoFlow River 3’s best-case solar harvest. Solar will stretch the runtime but not sustain it.
Tips
- Compressor coolers like Dometic, ICECO and BougeRV plug into the 12V car port, which skips inverter losses entirely.
- Running it from the EcoFlow River 3’s DC port instead of the AC outlet avoids inverter losses: about 17Wh more usable energy.
- The EcoFlow River 3 uses LiFePO4 (LFP) cells, rated for thousands of cycles, so running it down daily won’t wear it out quickly.
Other power stations running a 12V car fridge
| Power station | Capacity | Output | Runtime | Verdict |
|---|---|---|---|---|
| EcoFlow River 2 | 256Wh | 300W | 13 hours | Yes |
| Jackery Explorer 240 v2 | 256Wh | 300W | 13 hours | Yes |
| Bluetti EB3A | 268Wh | 600W | 14 hours | Yes |
| Jackery Explorer 300 Plus | 288Wh | 300W | 15 hours | Yes |
| Anker SOLIX C300 | 288Wh | 300W | 15 hours | Yes |
| Goal Zero Yeti 500X | 505Wh | 300W | 26 hours | Yes |
| EcoFlow River 2 Max | 512Wh | 500W | 26 hours | Yes |
| Anker 535 PowerHouse | 512Wh | 500W | 26 hours | Yes |
FAQ
Will the EcoFlow River 3 run a 12V car fridge overnight?
Yes. Eight hours uses about 144Wh, roughly 64% of the EcoFlow River 3’s usable capacity.
How long does the EcoFlow River 3 take to recharge with solar?
With its maximum 110W of solar input it refills in about 3 hours of strong sun. A single 200W panel is enough to max out its solar input.