Battery connection voltage
The rated input voltage for which the autoinverter is designed. This indicator must correspond to the rated voltage of the battery used with the device:
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12 V. The most popular battery voltage used in modern transport: used in the vast majority of passenger cars, also found in motorcycles and trucks.
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24 V. This option is typical for heavy equipment - buses, trucks, tractors, etc.
Note that the actual battery voltage during operation can vary within a few volts - mainly due to changes in the charge level. But autoinverters are created taking this feature into account and can operate normally in a certain voltage range. Therefore, in the general characteristics it is quite enough to indicate the nominal voltage of the battery; the specific operating range is often given only in detailed documentation.
Rated power output
The total power supplied by the autoinverter in normal operation. In other words, this parameter can be described as the
highest rated power of the connected load, at which the device is able to work without failures and overloads for a long time (comparable to the discharge time of the battery used for power).
Accordingly, when choosing according to the rated output power, it is worth proceeding from the energy consumption of the intended load. At the same time, it is worth choosing an inverter with a margin of 15-20% — for example, for a laptop with a consumption of 150 W, a device with at least 175 W is recommended. This is due not only to overload protection, but also to the fact that many inverters are able to deliver the claimed power only when the battery is fully charged, and as this charge is exhausted, it decreases.
It is also worth considering that some devices, such as car refrigerators or household vacuum cleaners, consume significantly more energy when starting up than during normal operation. Therefore, when choosing an inverter for such devices, it is worth focus not only on the rated, but also on the peak power — the power that the auto-inverter is capable of delivering without consequences within a few seconds.
Peak power output
The highest total power supply (peak) that the autoinverter can deliver to the load for a relatively short time is 2-3 s. Usually, this power is higher than the nominal one (see above) by 30-50%. At the same time, if you choose an inverter for maximum power, the same rules apply as for the nominal one — the device performance should be 15-20% higher than the total power of the connected load. And to work with devices that consume a large amount of energy at startup (vacuum cleaners, power tools, etc.), it is also worth specifying the peak power of the inverter — it should not be lower than the "starting" load power.
Efficiency
Efficiency of the autoinverter.
Efficiency is the ratio (in percent) between the amount of energy that the device delivers to the load and the amount that it consumes from the vehicle's on-board network. Accordingly, the higher this indicator, the more efficient the work and the less loss during conversion. In fact, this means that, other things being equal, a device with a higher efficiency will allow the load to run longer on battery power; this is especially important at high power consumption.
In modern auto inverters, efficiency values of 80 – 85% are considered average, 90% or more are good.
Number of sockets
The number of standard sockets for 230 V provided in the design of the auto-inverter.
The more outlets, the more electrical appliances can be connected to the inverter at the same time. At the same time, the specifics of using automotive converters is such that they rarely have to be used for several devices at once. In addition, simultaneous connection requires appropriate power (see "Rated output power"), and the sockets themselves also significantly affect the dimensions. Therefore, most often in modern models
one outlet is used — this, usually, is enough. However, high-end powerful inverters can have
two outlets.
Remote control connection (RJ-45)
The presence of
an RJ-45 connector allows you to connect a wired remote control to the inverter. Using a cable with RJ-45 connectors at both ends, the auto-inverter is connected to the remote control for remotely turning on/off the device, setting parameters, monitoring system status, etc. It is worth noting that the remote control is not always included in the kit; you will often need to purchase it separately.
Remote control
The kit includes
a remote control that allows you to coordinate the functions of the auto-inverter at a distance. The convenience here is obvious - the remote control provides the ability to control the operation of the device remotely, without approaching it. This can be useful if the car inverter is installed in a hard-to-reach place. Note that the remote control usually bears the simplest functions, such as simply turning the device on and off.
Dimensions
General dimensions of the autoinverter.
In modern cars (especially passenger cars), usually, there is not much space for installing additional equipment. This parameter allows you to estimate the space required to place the inverter, make sure that the selected device fits into the “footprint”, and, if necessary, choose another location or another model. At the same time, it must be remembered that for many auto-inverters a certain margin is needed in place — for the normal operation of the cooling system; this margin is usually specified in the detailed documentation.
