How long will the EcoFlow River 3 run a 12v cooler / fridge?

Q: Will the EcoFlow River 3 run a 12v cooler / fridge?

Yes — the River 3 runs a 12v cooler / fridge comfortably. Its 300W continuous output easily covers the 45W draw, with 600W of surge on tap for startup.

Q: How long will the EcoFlow River 3 run a 12v cooler / fridge?

The EcoFlow River 3 has 245 Wh (about 188 Wh usable at the outlet, estimated). Running a 12v cooler / fridge that draws 45W, it lasts about 4.2 hours on a single full charge.

✓

Will the EcoFlow River 3 run a 12v cooler / fridge?

Yes — the River 3 runs a 12v cooler / fridge comfortably

Its 300W continuous output easily covers the 45W draw, with 600W of surge on tap for startup.

Estimated runtime

about 4.2 hours

on a single full charge

Est. usable (AC): 188 Wh

Appliance draw: 45 W

Continuous output: 300 W

How we calculated this

We start from the EcoFlow River 3's 188 Wh of estimated usable energy at the outlet — its 245 Wh rating, derated for a safe depth of discharge and ~15% inverter loss — then divide by the 12v cooler / fridge's 45W draw:

188 Wh ÷ 45 W ≈ 4.2 hours

Heads up: a 12v cooler / fridge is a motor/compressor load that spikes 2–3× on startup. The EcoFlow River 3's 300W continuous / 600W surge output has plenty of headroom for that spike.

Real-world runtime varies with temperature, cable losses, and how hard the appliance actually cycles. Treat this as a solid estimate, not a guarantee.

Check River 3 price → Full River 3 specs →