What Is the Purpose of OCPP in Charging Infrastructure?

OCPP (Open Charge Point Protocol) is an open and widely used communication protocol specifically developed for electric vehicle (EV) charging stations or charge points. Its objective is to set efficient and secure connections between charging stations and central management systems. OCPP implies multiple functionalities such as secure transactions, diagnostics, power control, and data exchange. 

Functions and Structure of OCPP

Message Flow 

Description 

Registration 

 

CMS to Charging Station 

Transfers a registration request to the charging station, enables identification and configuration information. 

Charging Station to CMS 

Acknowledges the registration request, provides its identification and capabilities to the CMS. 

Status and Monitoring 

 

CMS to Charging Station 

Transfers a status request to the charging station to gather real-time information about its availability, power, and some other indicators. 

Charging Station to CMS 

The charging station responds with the requested status information, including its availability, charging power, and any ongoing charging sessions. 

Charging Session Control 

 

CMS to Charging Station 

Starts a charging session via start command sent to the charging station, along with the necessary parameters. 

Charging Station to CMS 

Acknowledges the start command and initiates the charging session, enabling status updates to the CMS. 

CMS to Charging Station 

Sends commands to pause, restart, or terminate the charging session. 

Charging Station to CMS 

Carries out the commands sent by the CMS, updating the charging session status. 

Transaction Handling 

 

Charging Station to CMS 

Sends transaction data, such as the start time, end time, energy consumption, and cost, to the CMS during and after the charging session. 

Firmware Updates 

 

CMS to Charging Station 

Sends firmware update requests to the charging station, with firmware files and instructions applied. 

Charging Station to CMS 

Acknowledges the update request and performs the firmware update process, sending progress and completion notifications to the CMS. 

Influence on Device & Software Communication 

Can all devices and networks labeled with the "OCPP tag" communicate with each other? The answer is yes, with one important consideration: the OCPP version. As long as the charging station management system and EV charging hardware both support the same OCPP version, it is possible to establish a connection between any OCPP hardware and software. For example, our go-e Chargers are designed to comply with the widely used OCPP 1.6 version. Therefore, they function flawlessly within a network where all other chargers also support this specific version. Here’s the list of existing versions: 

  • OCPP 2.0.1

  • OCPP 1.6

  • OCPP 1.5 

What Are the Key Obstacles of OCPP? 

OCPP strongly relies on the connectivity between charge points and the backend application. Without it, they cannot operate, and providers cannot efficiently manage their devices. Cellular IoT is a popular connectivity option due to its global coverage and added security. In addition, there’s not enough remote access to charge points for reconfiguration, troubleshooting, and updates. This means on-site access and additional supply and logistic costs are applied.   

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