In design, the eCitaro is modelled on another great archetype from the Mercedes-Benz bus and coach family. You can see it clearly by its frontage, which is reminiscent of the fascinating Future Bus design. The central design element is the Mercedes star. The model name, with a blue “e”, signifies the drive technology. The stylish, curved windscreen comes from the Citaro Ü intercity. Optical effects such as the attractive lateral elevation to the edge of the roof, made of a multi-section extruded aluminium profile, give the eCitaro excellent proportions, whether as a solo or as an articulated bus (eCitaro G).

The eCitaro G articulated bus has a special feature: if stringent requirements are made in terms of power and traction, Mercedes-Benz will deliver it with two powered axles. This ensures superior dynamics, even in challenging conditions. For example, on steep inclines, on the roads in winter – or both. The electric drive axle itself, with its space-saving electric motors located close to the hub, has proven itself time and time again and has earned its place in the hall of fame.

Depending on the usage profile, the energy is purposely derived from different batteries. Transport companies can choose between second-generation NMC batteries (lithium nickel manganese cobalt oxide cells) and innovative solid-state batteries. These differ in structure, cell chemistry and properties. The NMC2 battery components are modular and achieve a high capacity up to 396 kWh in the solo and articulated bus. If transport companies prefer intermediate charging, they can select a lower capacity to save weight. Solid-state batteries have an even higher energy density and are particularly durable.

The eCitaro with NMC2 batteries can be charged by plug, pantograph or charging rails. Solid-state batteries are only suitable to a limited extent for intermediate charging. That is why Mercedes-Benz always installs six or seven battery assemblies with a variable capacity of up to 441 kWh. These are always charged by plug and there are various charging socket positions available: front right above the wheel, front left or at the rear. Up to two of these positions can be installed per vehicle.

Even more clever ideas are hidden within the eCitaro and its articulated colleagues. For example, when thinking of the maximum passenger capacity, Mercedes-Benz also considers optimal weight distribution. That is why the battery assemblies have different positions on the roof depending on the placement and vehicle class. In addition, solo and articulated buses have battery assemblies of different sizes in the rear. Altogether, this guarantees optimal utilisation of the permissible axle loads and thus maximises the number of passengers.

The thermal management system is just as ingenious. Compared to the Citaro with its internal combustion engine, the energy needed for heating, ventilation and climate control is reduced by around 40 percent. This extraordinary energy efficiency allows workable ranges to be achieved. The NMC batteries are kept at the ideal temperature of 25 degrees Celsius for optimal charging and maximum durability. Solid-state batteries require an operating temperature of 80 degrees Celsius. Thanks to the powerful insulation of the batteries, this can be achieved without additional heating.

The passenger compartment is heated economically using a heat pump, aided as required by the braking resistance. The heat-generating components are networked to keep the energy required to cool them at a minimum. The heat pump is integrated in the roof-mounted air-conditioning system. This uses environmentally-friendly CO₂ as a coolant. Pre-conditioning of the interior during battery charging at the depot also reduces energy consumption.

In contrast to its on-board technology, the cockpit of the eCitaro only differs insignificantly from that of a conventional city bus – so drivers can switch vehicles without a hitch. And of course, the eCitaro is as safe as you’d expect from a Mercedes-Benz. Particularly deserving of mention are the optional assistance systems such as Preventive Brake Assist, the first active braking assistant for city buses, as well as the turning aid Sideguard Assist. Both have person detection and thus protect more vulnerable road users.