Every 12V fridge gets a score from 0 to 100% built from five factors, which maps onto the 5-point rating shown on the site (a 0% score would be 1.5 stars; a perfect score, 5). Each factor is scored against fixed reference points, not against the other products in the list, so adding a new model never moves another model’s rating. Fridges are ranked within their size: small (under 30 liters), mid-size (30 to 49 liters) and large (50 liters and up).
| Factor | Measures | Weight |
|---|---|---|
| Value | price per liter | 35% |
| Efficiency | daily energy use per liter | 20% |
| Warranty | unit and compressor cover | 20% |
| Build | named compressor maker, tested display accuracy | 15% |
| Portability | empty weight per liter | 10% |
Where the numbers come from
Capacity, temperature range, weight, warranty and the compressor maker come from the maker’s spec page, manual or warranty terms, linked on every product page. Where a maker gives only quarts, liters are converted at 1.057 quarts to the liter.
There is no certified energy rating for 12V fridges in the US. Makers state energy use in ways that don’t line up: Dometic gives amp-hours per hour at 90 °F, ICECO gives kilowatt-hours per day with no conditions, EcoFlow gives watt-hours per day at 77 °F, and many brands give only a rated or “eco mode” wattage. Daily energy use is taken from the best of these, in this order:
- An independent measurement: watt-hours over 24 hours, or the average draw while holding temperature, times 24.
- The maker’s stated daily energy, amp-hours per hour (times 12 V and 24 hours) or average draw.
- The EU energy label’s yearly figure, divided by 365, when the fridge is registered as a fridge. Some makers register theirs at a 17 °C “pantry” setting, and those figures aren’t used.
A rated or eco-mode wattage is the draw while the compressor runs, not an average over a day, so it is shown but not scored. Every product page says which source its figure came from.
Reference points by size
| Size | Price per liter, scoring 0 → 100 |
|---|---|
| Small (under 30 L) | $40 → $8 |
| Mid-size (30 to 49 L) | $30 → $6 |
| Large (50 L and up) | $25 → $5 |
The factors
Value is the lowest checked price divided by the capacity in liters. Prices are checked by hand and dated on every page. Small fridges always cost more per liter, so each size has its own scale. A fridge with no current price gets the neutral middle score.
Efficiency is daily energy use divided by capacity: 14 Wh a day per liter scores zero and 4 Wh full marks. A figure from an independent measurement is used as is. A maker’s or EU figure is used too, but the factor is marked estimated, because test conditions differ from maker to maker. A fridge with no usable figure gets the neutral middle score.
Warranty combines the compressor term (60%) and the term for the whole unit (40%), each scored from 1 year (zero) to 5 years (full marks). Where a maker gives no separate compressor term, the unit term counts for both. A term the maker doesn’t state counts as the neutral middle, and the factor is marked estimated.
Build averages two things. The first is the compressor maker, where it’s stated: Secop (formerly Danfoss), Sawafuji, LG and Embraco, with long records in 12V fridges, score full marks, and any other named maker 60%. The second is how closely the display matched the real temperature in an independent test: 6 °F off scores zero and within 1 °F full marks. A fridge whose maker doesn’t name the compressor is marked estimated, and one with neither gets the neutral middle score.
Portability is empty weight per liter: 1.6 lb per liter scores zero and 0.6 lb full marks. A light fridge is easier to lift into a vehicle when loaded.
What isn’t scored
Zones, batteries and app control are shown and can be filtered, but aren’t scored. A dual-zone fridge or a battery is worth paying for only if you need it. The dual-zone and battery-powered lists show only those. Noise, pull-down time and the lowest temperature setting are listed where published but not scored, because makers and testers measure them in different ways.
Missing data
If a figure isn’t published, that factor gets the neutral middle score (50) and the product page marks it as estimated.
Ties and discontinued models
Products are ranked by score within each size. Discontinued models stay listed but rank below every current model and can be hidden with the “Hide discontinued” filter.