12V Fridge Buying Guide: Sizing, Power Draw & What to Buy
A 12V compressor fridge ends soggy-cooler misery — but only if you size it right and can feed it power. Here's how to pick capacity and not kill your battery.
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Once you've camped with a 12V compressor fridge, the ice-in-a-cooler era is over — no melting, no soggy food, cold drinks for a week. But a fridge is a power draw you have to plan for. Here's how to buy the right one and keep it running.
Compressor fridge, not a thermoelectric cooler
Get a compressor fridge/freezer (the kind that actually refrigerates and freezes regardless of ambient temp), not a cheap thermoelectric "cooler" that only chills a few degrees below outside air. The compressor is the whole point.
Sizing (capacity)
Fridges are sized in liters. Rough guide:
- Solo / weekend: a smaller unit (~mid-30s L or less) fits behind a seat or in a drawer.
- Couple / longer trips: ~40–50L is the sweet spot for most.
- Family / long expeditions: 60L+ or a dual-zone (fridge + freezer) unit. Bigger holds more but draws more power, weighs more, and eats cargo space. Buy for your typical trip, not your longest fantasy one.
Power draw — the part beginners underestimate
A fridge cycles its compressor on and off, so its average draw is much lower than its peak. Still, over a day it adds up, and it runs 24/7 — including while you sleep and while you're away from camp. That means:
- You need a way to feed it: a dual-battery / DC-DC setup, a portable power station, or solar to top up — or all three.
- Running a fridge straight off your starter battery overnight is how you get a dead battery and a no-start morning. Isolate it.
Features worth having
- A good thermostat + app/display to set and monitor temps.
- Dual-zone if you want fridge and freezer at once.
- Sturdy latches, a drain, and tie-down points — it lives in a moving vehicle.
- Efficient insulation — the less the compressor runs, the less power you burn.
Bottom line
Buy a compressor fridge sized to your normal trip, and — just as important — build the power to feed it (dual battery/DC-DC, a power station, and/or solar). Get both halves right and you'll never go back to a cooler. Get the power wrong and your fridge becomes a very expensive way to drain your battery.