12V Cool Box Buying Guide
How to choose a 12V cool box for your caravan or motorhome: the three cooling types, power draw and capacity, and which one suits how you travel.
A 12V cool box is the practical alternative to a built-in fridge when you are touring in a caravan or motorhome. It runs off your leisure battery, a hookup or your vehicle socket, takes up far less space than a fridge, and keeps food and drink fresh without dominating your power supply. This guide explains the three types you will come across, how to match one to your setup, and where they fit into your wider caravan electrics and your insurance.
What a 12V cool box actually is
It is a portable cooler that plugs into a 12V supply rather than relying on ice. Most run from a vehicle cigarette socket or your caravan electrics, and many also accept 230V mains so you can switch to hookup on site. Some models cool only, while others also have a warm setting and a USB port for charging phones or a tablet. The right choice depends less on brand and more on which of the three cooling technologies below suits how you travel.
The three types of 12V cool box
Lightest and cheapest
Uses the Peltier effect, with no compressor and no moving parts. Typically chills to around 18 to 20°C below the outside temperature and cannot freeze. Low power draw, often with a warm setting too.
Best for: short trips and mild weather. Watch: performance is tied to the ambient temperature, so it struggles on hot days.
True fridge performance
Works on the same refrigeration cycle as your home fridge. Holds a set temperature regardless of the heat outside, can freeze, and copes with being on a slope.
Best for: longer trips, hot climates and anyone who wants reliable fridge or freezer performance. Watch: higher purchase cost.
Off-grid flexibility
Runs on 12V, 230V mains or gas, and operates silently. The flexible power options make it popular for off-grid stays where gas is available.
Best for: pitches with gas. Watch: heavy current draw on 12V will flatten a leisure battery quickly, and it needs to sit reasonably level to work well.
How to choose the right one
Capacity
Match the litre size to your trip length and the number of people travelling. A weekend for two needs far less than a fortnight for a family. Larger boxes draw more power, so do not oversize for the sake of it.
Power and your leisure battery
This is the deciding factor for most owners. Think in terms of how long the box can run off your leisure battery between charges, not just the wattage on the box. If you are mostly on hookup it matters less, but for off-grid touring a low-draw thermoelectric model or an efficient compressor box paired with a solar panel setup or a pure sine wave inverter will keep you running for longer.
Temperature performance and insulation
Good insulation holds the cold in every time you open the lid, which is where cheaper boxes lose ground. If you want to keep food for several days, choose a compressor model that can freeze rather than a thermoelectric one that only chills.
Portability and extras
A lighter box is easier to move from car to pitch to beach. Useful extras to look for are a dual cool and warm function, split compartments to keep raw and cooked food apart, and a USB charging port.
Your cool box counts towards your contents cover
A 12V cool box is one of several appliances that add up when you total the contents of your caravan or campervan. Add the microwave, TV, leisure battery kit, awning and outdoor gear and the figure climbs faster than most owners expect. Many policies cap contents cover as standard (often around the £3,500 mark, with higher limits available on request), so it is worth totalling what you actually carry and checking it against your limit before your next trip.
Compare touring caravan insurance quotes to check your contents cover is set at the right level.