Here it is possible to use an external control unit, which replaces the Controller Wallbox at the same time. Consisting of an LTE module and the SBC, this component is installed in a location with sufficient reception. With the aid of this component, load management can also be operated in the form of a controller-extender system and up to 16 charging points (excluding extenders) can be integrated.

When a charging process is completed at a charging station that is subject to a charge, no more electricity flows (0 kW). However, a parking fee will still be charged, as other electric vehicles will not be able to charge at this charging station.

In a controller-extender configuration, several charging points are connected in series. One charging station acts as the controller. The communication controller (Single Board Computer short SBC) for controlling all charging points is integrated in the controller charging station. In addition, the connection to the backend runs via the controller. Within the system, load management can be operated with a specified maximum current so that exceeding the maximum current is prevented. Optionally, the consumption of an entire building can be measured and the charging infrastructure adapted.

Every hardware manufacturer can offer different backend operators that are compatible with its charging stations. ABL offers the possibility to integrate almost any backend.

There are various communication options for establishing communication with the backend. On one hand, communication can take place with the aid of LTE via a SIM card. On the other hand, it is possible to communicate with the backend via the integration of an existing LAN. Currently, ABL also offers communication via wireless LAN.