When the charging station is turned on, the OCPP tries to connect with the management software. The software verifies the identity of the charging station. After successful verification, the IT backend sends a signal to the EV charging station management system to identify its availability. The station responds by providing its current status with the date and time.
The authorization process begins when a user requests to start the charging. In response to the request, the power supply nozzle is unlocked and plugged into the e-vehicle to start charging. At this stage, OCPP sends another transaction message denoting that the charging process has begun.
When the user wants to stop charging, identification verification is required again at the charging station through the mobile app. When the StopTransaction message is sent to the station, the charging is stopped and the user is ready to leave.
The OCPP protocol benefits the EV charging system in many ways:
- Reservation: The drivers or the owners of EV have the advantage of reserving the place using the app.
- Remote features: Station partners can remotely manage the functionalities of charging stations.
- Smart charging: The charging station automatically increases or decreases the power supply to optimize its performance.
- Data transmission: OCPP supports data transfer between different mobile apps, management software and EV charging stations.
- Diagnosis: It anticipates issues beforehand and gives warnings in advance. It also provides the capability to diagnose and solve problems remotely.
- Reporting: OCPP gathers complete information about the charging station’s current state and reports it to system administrators.