User's Manual

User Manual User Guide

3.6 EVSE Topology

The configuration’s structure is based on OCPP’s 3-tier model which is also used by vCharM.

This model describes the charging infrastructure on a logical level, consisting of three ele-

ments: ”Charging Station”, ”EVSE” and ”Connector”.

Charging Station The term charging station describes a physical system where an EV

can be charged. Each vSECC unit corresponds to one charging station. This relationship is

based on a unique charging station OCPP ID for each charging station. Figure 24 shows the

edit menu of the charging station ”vSECC” which consists of two EVSEs with one connector

each.

Figure 24: vCharM Charging Station Editing

EVSE An EVSE is defined by its ability to deliver energy to one EV at a time. A charging

station can be connected to one or more EVSEs. Since the 3-tier model operates on a logical

level, no assumptions are made about the physical hardware mapping. For example, the

EVSE might be integrated into the charging station device itself. However, it could also be

placed in a separate power electronics casing outside the charging station.