Here it is possible to use an external control unit, which replaces the Master 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 master-slave system and up to 16 charging points (excluding slaves) can be integrated.

A basic distinction must be made between the employee and the visitor. By 2020, companies may give their employees the electricity used for charging. The electricity consumption for charging visitors EV´s must already be recorded and billed today. We therefore recommend that our customers purchase billable wallboxes, as it is expected that the electricity consumption for charging employees will also have to be recorded and billed from 2020.

In this case, another master-slave system must be set up. The possibility of cascading, i.e. a structure in which several master-slave systems function in parallel with each other, will be planned for in the near future.

In a master-slave configuration, several charging points are connected in series. One charging station acts as the master. The communication controller (Single Board Computer short SBC) for controlling all charging points is integrated in the master charging station. In addition, the connection to the backend runs via the master. 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.