Comparison Mystery MTC-8 vs Mystery MTC-16

— Refrigerator container. Thermally insulated containers designed for use in cars and as close as possible to ordinary kitchen refrigerators both in functionality and appearance. They look like boxes, most often plastic, can have a rather large volume (40 liters or more), are designed primarily for stationary installation in a car and are usually quite inconvenient to carry (although most models can be easily carried in hands over short distances). Equipped with temperature maintenance systems (up to compressors, see "Functions"), they require external power supply.

— Cooler bag. Like the containers described above, this type belongs to car accessories, requires external power, is able to provide cooling similar to classic refrigerators, and can also have other modes of operation (see below). Externally, in accordance with the name, such models resemble ordinary bags, often have fabric upholstery, external pockets, and almost always carry handles. They are easy to transport in your hands, which can be useful for loading: it is often more convenient to load the refrigerator in the kitchen and transfer it to the car than to carry the products separately to the car. This design of the refrigerator is also especially convenient for outdoor trips, picnics, etc. On the other hand, bags usually have a small volume (not exceeding 40 liters).

— Embedded. As the name implies, this variety is desig...ned for permanent installation in vehicles. Its main difference from the containers-refrigerators described above is its poor suitability for carrying from place to place, in addition, such devices can have quite large volumes. Due to their large size, most built-in refrigerators are not well suited for passenger cars, where there is usually little space — but they can be very useful for buses, tractors, motorhomes, and even boats and yachts. Some of these models are originally made for a specific brand of car.

— Refrigerator-armrest. A specific type of refrigerator-containers (see the relevant paragraph). The main difference of this variety from the "ordinary" containers is just the possibility of installation as an armrest. At the same time, installation methods can be different: some models are placed in the centre of the rear seat and are fixed with a seat belt, others can also be installed between the front seats. The main advantage of such units can be called the fact that they create a minimum of discomfort, and often vice versa — they provide additional convenience, playing the role of the actual armrest. In addition, coasters and other additional devices can be provided on the case. However, before buying, you should make sure that the selected model is suitable for your car in shape and dimensions. Also note that the volume of refrigerators of this type is relatively small — usually less than 25 liters.

The volume of the working chamber of the car refrigerator. The larger the volume, the more products can be loaded into the unit at a time. When choosing according to this parameter, it makes sense to select a model with a margin, because it is not recommended to load products too tightly — this adversely affects the quality of the device. On the other hand, note that the volumetric container and dimensions will have the appropriate ones.

The presence in the refrigerator of separate zones for storing products, separated by a stationary dense wall of a non-removable structure. The vast majority of car refrigerators have a single-chamber layout, however, there are also two-chamber models, which is extremely convenient for sorting products.

This parameter determines how many degrees the refrigerator is able to cool the product loaded into it relative to the ambient temperature. Let's say the maximum cooling for a particular refrigerator model is 20°C; at an air temperature of +30°C, a product with the same temperature is loaded into it. Thus, the final temperature of the product will be 30 – 20 = +10 °C. In addition, it should be noted that the final temperature cannot be lower than the minimum cooling temperature (see Minimum cooling temperature)

The minimum temperature to which the refrigerator is able to cool the product placed in it when operating in cooling mode. It should be taken into account that the minimum cooling temperature is not always achievable in fact: the actual cooling temperature depends on the ambient temperature and on the capacity of the refrigerator for maximum cooling (for more details on the calculation formula, see "Maximum cooling per (°C)"). However, this applies only to refrigerators that are not equipped with compressors (see Compressor); compressor models are able to reach the minimum cooling temperature regardless of external conditions.

The power consumed by the refrigerator when operating in cooling mode. The greater this power, the more performant the refrigerator is, usually, and the less time it takes to cool the product. On the other hand, note that more power means more power consumption — which can be critical, for example, during long-term operation from a car battery (that is, when the car engine is turned off).

The supply voltage for which the car refrigerator is designed. There are several standard options:

— 12 V Standard voltage of the on-board mains of passenger cars, as well as many minibuses and light trucks. Supported by most modern car refrigerators.

— 24 V Standard voltage of the on-board mains of buses, heavy trucks and other large equipment; also found in some SUVs. Car refrigerators "only for 24 V" are almost never produced; as a rule, this option is provided in addition to 12 V.

— 230 V Powered by a standard household outlet. Usually a backup option, in case the refrigerator needs to be turned on outside the car for a while — for example, to pre-cool before a trip. In addition, units with such power can be used as an improvised replacement for a stationary refrigerator — for example, when going to the country, where there is no permanent refrigerator.