If customers wish to charge several electric cars at one location, a load management system can help to optimally distribute the available charging power among all charging electric cars and thus avoid overload. In this way, the load management system optimally adapts the total consumption to the given conditions and can help to save investment and operating costs.
Local energy management controls the consumption of all linked vehicles. In the process, charging points with different parking / charging times as well as customer, visitor and employee parking spaces can be taken into account and prioritized. The systems can be controlled and configured via the master unit of the front end or the master station. The system is therefore scalable without much effort
As a rule, the available feed-in power is limited to a maximum. Since the instantaneous consumption of existing units represents a dy-namic current flow, it is necessary to be able to react flexibly by means of dynamic load management in the charging system. This can be realized, for example, by means of external consumption measurement. The instantaneous power of existing consumers is thus recorded and read out by the master unit of the charging system. The difference between the maximum feed-in power and the power currently being drawn is hereby calculated. In the charging system, therefore, only this instantaneous difference is released to charge vehicles. This counteracts load peaks, for example.
A further option for implementing dynamic monitoring is the integration into an energy or building management system. The communica-tion takes place via Modbus-TCP. In addition, the basis for "smart charging" via OCPP 1.6 is already set in the WALTHER charging systems. Some backend providers thus enable dynamic load management via backend.
Increased single and two-phase charging can lead to an uneven phase load – i.e. unbalanced load. So how can an optimum phase load be ensured? The wiring on the connection side of the respective phase assignment is configured by walther.Config according to the connec-tion conditions and a maximum unbalanced load including tolerance is set. In the charging system itself, the current flow per phase is recorded and regulated according to the specifications.
