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The EQA is being launched as the EQA 250 (combined electrical consumption: 15.7 kWh/100 km; combined CO2 emissions: 0 g/km)[1] with 140 kW and a range according to NEDC of 480 kilometres. The "double-decker" lithium-ion battery, which sits as a structural element within the underbody of the vehicle, has a usable energy content of 66.5 kWh. Further variants to meet specific customer requirements will follow. These will include on the one hand all-wheel-drive models with an additional electric powertrain (eATS), and on the other hand a version with a range of more than 500 kilometres (WLTP)[2].

An asynchronous motor is used at the front axle. The electric motor, a fixed-ratio transmission with a differential, the cooling system and the power electronics form a highly integrated, very compact unit - the electric powertrain (eATS). The transmission ratio and gear wheels have been configured for the requirements of the front-wheel drive system.

The more powerful models include a further electric powertrain (eATS) at the rear axle featuring a redesigned, permanently excited synchronous motor. This is extremely compact in design. In a permanently excited synchronous motor, the rotor of the AC motor is studded with permanent magnets. The magnets – and thus the rotor – follow the rotating alternating current field in the winding of the stator. The engine is said to be synchronous, because the rotor turns at the same rate as the magnetic field of the stator. The rate is adjusted to the speed requirements of the driver in the frequency converters of the power electronics. The advantages of this design include the high power-to-size ratio, high level of efficiency and high output consistency.

The balance of performance between the front and rear axles in the 4MATIC versions is intelligently adjusted up to 100 times per second, depending on the driving situation. The Mercedes-EQ philosophy is to optimise consumption by using the rear electric motor as often as possible, while the asynchronous motor at the front axle generates only minimal drag losses in partial-load operation.

Technical data[3]

EQA 250
Drive system layout Front
Electric motor, front axle ModelAsynchronous motor
Rated outputkW140
Rated torqueNm375
Acceleration 0-100 km/hs8.9
Top speed[4]km/h160
Battery capacity, usable (NEDC)[5]kWh66.5
Combined fuel consumption (NEDC)2kWh/100 km15.7
NEDC range2km486
Charging time[6] at wallbox or at public charging stations (AC charging)h5:45
Charging time[7] at a rapid charging station (DC)min30
In overrun mode or during braking, the electric motors become alternators: their mechanical rotation is converted into electrical energy and used to charge the high-voltage battery - a process known as recuperation (for details see the next section on "Recuperation").

The battery: Part of the intelligent thermal management system

The EQA is fitted with a lithium-ion battery with a high energy density. The battery is made up of five modules and is located underneath the passenger compartment in the middle of the vehicle. The lowest point of the vehicle, however, is the lower edge of the side skirts, giving the EQA more than 200 mm of ground clearance.

The battery features a "double-decker" design, making it another example of the intelligent use of space: The "nose" of the battery, which accommodates the battery management system, is situated towards the front, behind the centre console. An aluminium housing as well as the body structure of the vehicle itself protect the component from potentially touching the ground and against loose chippings. The battery housing is part of the vehicle structure and thus an integral part of the crash concept (see section on "Passive safety").

The powerful high-voltage battery has a maximum voltage of 420 V and a nominal capacity of 190 Ah, giving it an energy content of 66.5 kWh.

The battery is part of the intelligent thermal management system of the EQA. To ensure that it is always kept within the optimum temperature range, it can be cooled or heated as required via a coolant-fed plate underneath the battery.

If Navigation with Electric Intelligence is activated, the battery may also be pre-heated or cooled while driving in order to ensure that it is within the ideal temperature window for a rapid charging station. On the other hand, if the battery is cold when the car reaches the rapid charging station, a considerable proportion of the charging capacity will initially be used simply to warm it up. The net effect is to optimise the charging time – important, as a means of significantly shortening the charging stop.

As for all other high-voltage batteries, Mercedes-Benz issues a battery certificate, thus providing a performance warranty. This is valid for eight years or a distance covered of 160,000 kilometres and guarantees a properly functioning high-voltage battery: the certificate also covers capacity loss in the battery.

Charging management: CCS charging socket for alternating current as well as direct current

At home or at public charging points, the on-board charger provides a convenient way of charging the EQA with up to 11 kW using alternating current (AC). The charging time required for a full charge depends on the available infrastructure and the country-specific vehicle equipment. Charging at a Mercedes-Benz Wallbox is considerably faster than at a domestic power socket.

And it is of course even faster at direct current (DC) rapid charging stations. Depending on the SoC (state of charge) and the temperature of the high-voltage battery, the EQA can be charged with a maximum output of up to 100 kW at an appropriate charging station. The battery can be charged in this case from 10 - 80 percent SoC in around 30 minutes. For AC and DC charging, the EQA is equipped as standard in Europe and the US with a CCS connector (Combined Charging System) in the right-hand side wall. In Japan or China the corresponding country-specific charging sockets are used. The charging times may also vary compared with those for the European model.

The following WLTP details on the stated vehicle are based on the consumption and CO2 figures valid in the German market and are to be understood as indicative information.

Depending on the chosen equipment, the specific vehicle can lie between the "WLTP Minimum CO₂/Consumption Value" and the "WLTP Maximum CO₂/Consumption Value".

A higher figure may apply as the basis for calculating the motor vehicle tax.

WLTP CO2 emissions
combined, max./min.
(g/km)[8]
WLTP combined electrical consumption, max./min.
(kWh/100 km)1
Electric range
total (km)1
EQA 250017.7426


[1] Electrical consumption has been determined on the basis of Commission Regulation (EC) 692/2008. The power consumption is dependent upon the vehicle configuration. Further information on the official fuel consumption and the official specific CO2 emissions of new passenger cars can be found in the "Leitfaden über den Kraftstoffverbrauch, die CO2-Emissionen und den Stromverbrauch neuer Personenkraftwagen" [Guide on the fuel economy, CO₂ emissions and power consumption of all new passenger cars], which is available free of charge at all sales outlets and from DAT Deutsche Automobil Treuhand GmbH (www.dat.de).

[2] The WLTP details on the stated vehicles are based on the consumption and CO₂ figures valid in the German market and are to be understood as indicative information. Depending on the chosen equipment, the specific vehicle can lie between the "WLTP Minimum CO₂/Consumption Value" and the "WLTP Maximum CO₂/Consumption Value". A higher figure may apply as the basis for calculating the motor vehicle tax. The stated figures were determined in accordance with the prescribed measuring method. They are "WLTP CO₂ figures" as per Article 2 No. 3 Implementing Regulation (EU) 2017/1153. The consumption figures were calculated based on these figures.

[3] The WLTP figures for the models listed applicable to the German market can be found at the end of the section. This information can be retrieved on a market-by-market basis from the relevant national Mercedes-Benz websites.

[4] Electronically limited

[5] Power consumption and range have been determined on the basis of Regulation (EC) No. 692/2008. Power consumption and range depend on the vehicle configuration.

[6] The charging times are for a 10-100% full charge at a wallbox or public charging station (AC connection with at least 11 kW, 16 A per phase)

[7] The charging times are for 10-80% full charge at a DC rapid charging station with a supply voltage of 400 V, current at least 300 A.

[8] The stated figures are the measured "WLTP CO2 figures" in accordance with Article 2 No. 3 Implementing Regulation (EU) 2017/1153. Electrical consumption and range were determined on the basis of Commission Regulation (EU) No. 2017/1151. Electrical consumption and range are dependent on the vehicle configuration, and in particular on the selected maximum speed restriction.
 
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