Best 12V Fridge for a Car: 3 Compact Picks (2026)

A car fridge has to clear a hurdle that a van or truck fridge rarely faces: it has to fit behind a rear seat or in a hatchback’s cargo area and still leave space for luggage. Dometic’s spec sheets list its CFX3 25 at about 22.4 inches long and 28 lb, and its CFX3 35 at 27.3 inches and 37.3 lb. EcoFlow lists the 35-liter GLACIER Classic at 27.8 inches and 45 lb. All three run on a 12V socket, so the real choice comes down to footprint, power draw and features. I went through each maker’s product page and owner’s manual to put together this short list for sedans, hatchbacks and compact SUVs.

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The short list

Pick	Best for	Volume	Size (L × W × H)	Listed weight	Maker price (Oct. 17, 2026)
Dometic CFX3 25	Sedans, small hatchbacks, solo trips	25 L	22.4 × 13.5 × 16.5 in	28 lb	Check current price
Dometic CFX3 35	Compact SUVs, two people for a weekend	36 L	27.3 × 15.7 × 16.0 in	37.3 lb	$799.99
EcoFlow GLACIER Classic 35L	Running away from the car, two temperature zones	35 L	27.8 × 15.8 × 15.9 in	45 lb	$699 (no battery) / $799 (with battery)

The CFX3 25 sizes are converted from Dometic’s metric listing (569 × 342 × 420 mm). Prices are from each maker’s own store on the date shown and change often.

Measure the car before you shop

Fit is the first thing to check. Before comparing specs, take three measurements:

Floor length of the space you’ll use (cargo floor, rear footwell or the back seat with the seat belt across it). Leave about 2 inches past the fridge’s listed length for the plug and air flow.
Height to the lid opening. Every pick here is a top-opening chest, so you also need room above it. Under a cargo cover, a 16-inch box with a lid that swings up may not open all the way.
Distance to a 12V socket. Dometic tells owners not to use splitters, pigtails or extension leads, because each one causes voltage drop that can make the fridge’s battery protection shut it off. Plan the spot around where the socket already is.

Ventilation also matters. A compressor fridge pushes heat out of side vents, and Dometic’s FAQ lists “provide proper space around ventilation holes” as one of three habits that keep energy use down. A fridge pressed against a seatback or packed in with duffel bags will run longer and draw more.

Dometic CFX3 25: the one that fits almost anywhere

The CFX3 25 is the smallest model in Dometic’s current CFX3 line. Dometic rates it at 25 liters total volume under IEC 62552-3. The spec table counts 33 twelve-ounce cans, while the marketing copy says 40, so plan on the lower number if you’re packing cans along with food. The VMSO3 compressor is rated to hold anything from +68°F down to -7.6°F, which means it works as a fridge or a true freezer.

On power, the spec sheet lists a 6.5A rated input at 12V and 3.2A at 24V, plus 0.69A on 120V AC. Rated input is the most it will ever pull, not what it averages. The useful number is energy consumption. Dometic lists 0.92 Ah per hour on 12V with a 90°F (32°C) ambient and a 39°F (4°C) interior. That’s a hot-car figure, and it works out to about 22 Ah, or roughly 265 Wh, across a full day (my estimate, 0.92 × 24 × 12V).

Other features: a 5V/2A USB port, Bluetooth control through the CFX3 app, an LED interior light, a drain plug, a removable wire basket, and M6 threaded inserts in the base so you can bolt it down. Dometic ships it with both a 12/24V DC cord and a 120V AC cord.

See the Dometic CFX3 25 on Amazon (choose the 25L size on the listing) or on Dometic’s CFX3 page.

Dometic CFX3 35: the sweet spot for a compact SUV

The CFX3 35 adds 11 liters for about 5 inches of extra length and 9 lb of weight. Dometic lists 36 liters and 50 cans. Its own sizing FAQ makes a useful point for anyone switching from a regular cooler: an ice chest needs about half its space filled with ice, so a powered fridge can be half the size of the cooler it replaces and hold the same food.

Dometic lists 0.98 Ah/h at a 90°F ambient and 39°F interior, about 23.5 Ah (about 282 Wh) per day by the same math, and a 7.5A rated DC input. It also lists 50W rated input on AC. Price on Dometic’s store was $799.99 when I checked, with free shipping to the lower 48 and a three-year warranty listed on the product page. Its feature set otherwise matches the 25: the same app, a 3-stage dynamic battery protection system, Active Gasket seal, USB port and M6 mounting points.

See the Dometic CFX3 35 on Amazon (choose the 35L size) or on Dometic’s store.

EcoFlow GLACIER Classic 35L: two zones and an optional battery

EcoFlow’s GLACIER Classic 35L takes a different approach. It’s about the same length as the CFX3 35 but is built around an optional 298Wh plug-in battery that slides into the fridge. EcoFlow says that battery holds 39°F for up to 43 hours in the 35L model, tested at a 77°F ambient in Eco mode. That means you can carry the fridge from the trunk to a picnic table or a hotel room and it keeps cooling without the car.

The spec table lists a “variable dual temperature” layout. The two sides can be set up to 39.6°F (22°C) apart, across an overall range of -4°F to 68°F. EcoFlow lists 165 Wh per 24 hours (0.57 Ah/h) refrigerating at 39°F and 520 Wh per 24 hours freezing at -0.4°F, both at a 77°F ambient. The fridge has an IPX4 rating and is listed as running from 14°F to 122°F ambient. EcoFlow quotes noise under 38.5 dB.

It has more charging options than the Dometic pair: 12/24V car power at up to 8A/100W, solar from 11–30V at up to 8A/110W, and an AC adapter rated 95W max. Listed net weight is 45 lb, and the 35L uses R600a refrigerant. Warranty is two years in the U.S.

See the GLACIER Classic 35L (without battery) on Amazon or on EcoFlow’s store.

Power draw side by side

Model	Listed consumption	Test conditions	Per day (estimate)	Max 12V input
CFX3 25	0.92 Ah/h	90°F ambient, 39°F inside	~22 Ah / ~265 Wh	6.5A
CFX3 35	0.98 Ah/h	90°F ambient, 39°F inside	~23.5 Ah / ~282 Wh	7.5A
GLACIER Classic 35L	0.57 Ah/h (165 Wh/24h)	77°F ambient, 39°F inside, Eco mode	~13.7 Ah / 165 Wh	8A (100W)

Don’t compare these rows directly. Dometic tests at 90°F and EcoFlow at 77°F, and a 13-degree hotter room makes any compressor run noticeably longer. Use each figure to size your battery, not to pick a winner on efficiency. For a closer look at the difference between a fridge’s starting surge and its steady draw, see our guide to surge watts vs running watts.

Running a fridge from the car’s own battery

Every pick here can shut itself off to save your starter battery, but you have to set it correctly. Dometic’s manual lists three battery protection levels. Each level has a cut-off voltage and a higher restart voltage:

CFX3 setting (12V)	Switches off at	Switches back on at	Dometic’s suggested use
High	11.8 V	12.6 V	Starter battery
Medium	11.2 V	12.2 V	Starter battery
Low	10.1 V	11.4 V	Auxiliary or dual battery

Dometic recommends High or Medium on a starter battery and Low only on a separate accessory battery. It also explains that the fridge reads voltage while the compressor is running, under load. A battery that shows 12.8V at rest can dip enough under load to trip the cut-off, which is why Dometic’s first tip for a “voltage low” alert is to remove extension cords and splitters.

Many cars cut power to the 12V socket when the ignition is off, which takes care of the problem for you. If yours keeps the socket live, the protection setting is what keeps you from needing a jump in the morning.

How long will it run parked? Battery math

Dometic’s formula is simple: divide usable battery capacity in amp-hours by the fridge’s Ah/h figure. Dometic counts lead-acid as about 50% usable, NMC lithium about 80% and LiFePO4 close to 100%. Here are estimates using the listed figures above:

Battery	Usable Ah (approx.)	CFX3 25 @ 90°F	CFX3 35 @ 90°F	GLACIER 35L @ 77°F
Dometic PLB40 (40Ah LiFePO4)	~40	~43 h	~41 h	~70 h
50Ah LiFePO4 jump-pack style box	~50	~54 h	~51 h	~88 h
GLACIER plug-in battery (298Wh)	n/a	n/a	n/a	43 h (EcoFlow’s figure)
1kWh portable power station (~85% usable via 12V port)	~70	~76 h	~72 h	~123 h

All of these are estimates. Real runtime depends on how full the fridge is, how often the lid opens and how hot the car gets. EcoFlow’s 43-hour figure for the plug-in battery works out to an average draw of about 6.9W (298Wh ÷ 43 h), close to its listed 165 Wh per day. To see how a bigger station handles a fridge over a whole weekend, read our DELTA 3 Max camping fridge test. If you’d rather run the fridge on AC from an inverter, our Victron Phoenix 1200 fridge guide covers sizing.

Dometic’s solar advice for the CFX line is a 100W or larger panel plus at least a 40Ah battery, with roughly six hours of sun per day as a planning figure.

Settings that save the most power

Use 39°F for the fridge and 5°F for freezing. Those are Dometic’s recommended set points. Its FAQ warns that even small changes in set temperature shift energy use.
Pre-chill at home on AC. All three picks accept household power, so bring the fridge down to temperature the night before and let the car only maintain it.
Keep it full. Dometic lists a fully packed fridge as its first energy-saving habit. Fill empty space with water bottles.
Use Eco mode on the GLACIER. EcoFlow’s runtime and consumption figures are all measured in Eco mode.
Trust the insulation during short stops. In a lab test with 24 cans in a CFX3 55, Dometic measured contents warming about 1°F per hour with the fridge off (38°F inside, 70°F outside). A one-hour lunch stop with the engine off won’t hurt anything.

Which pick is right for you

If you…	Choose
Drive a sedan or small hatchback and travel solo	CFX3 25
Have a compact SUV and cook for two over a weekend	CFX3 35
Want a fridge and a freezer side in one box	GLACIER Classic 35L
Want to unplug the fridge from the car for hours at a time	GLACIER Classic 35L with plug-in battery
Want to bolt the fridge down with factory threaded inserts	Either CFX3 (M6 inserts)
Care most about the longest listed warranty	CFX3 35 (three years listed)

FAQ

What size 12V fridge fits in a car?

For a sedan or small hatchback, 25 liters is a safe starting point. The CFX3 25 is about 22.4 × 13.5 × 16.5 inches. Compact SUVs usually take a 35–36 L model around 27–28 inches long. Measure first, and leave room for the plug and the lid.

Can a 12V fridge drain my car battery?

It can if the socket stays live and protection is off or set too low. Dometic recommends its High or Medium battery protection setting when the fridge runs from a starter battery. On a CFX3 at 12V, those cut off at 11.8V and 11.2V.

How many amps does a car fridge use?

Peak draw is listed at 6.5A (CFX3 25) to 7.5A (CFX3 35) at 12V. The average is much lower because the compressor cycles: Dometic lists 0.92–0.98 Ah per hour at a 90°F ambient, and EcoFlow lists 0.57 Ah per hour at 77°F for the GLACIER Classic 35L.

Can I run a car fridge overnight?

Yes, from a separate battery or power station. Running it from the car’s starter battery overnight isn’t a good idea. By the estimates above, a 40Ah LiFePO4 battery runs a CFX3 for well over a day in hot weather.

Is a compressor fridge better than a thermoelectric cooler for a car?

For keeping food at true fridge temperatures, yes. Dometic’s own comparison puts its compressor models under 1 Ah per hour against about 3.9 Ah per hour for a thermoelectric example, and thermoelectric units can’t freeze.

Does the GLACIER Classic 35L include the battery?

Not always. EcoFlow sells it with and without the 298Wh plug-in battery. On EcoFlow’s store the price was $699 without it and $799 with it on Oct. 17, 2026.

Bottom line

For most cars, the Dometic CFX3 25 is the easiest fridge to fit. It’s the shortest and lightest of the three, has a well-documented battery protection system, and has a power draw any 40Ah battery can handle. Step up to the CFX3 35 when you have the cargo floor for it. Choose the GLACIER Classic 35L when two temperature zones or cooling away from the car matter more than a small footprint.