What is the difference between ISO 15118 and OCPP?

In the world of electric vehicles (EVs) and charging infrastructure, there are two important sets of standards that play a crucial role - ISO 15118 and OCPP (Open Charge Point Protocol). While both are involved in the interoperability and communication aspects of EV charging, they have distinct differences. This article aims to explain the dissimilarities between ISO 15118 and OCPP in an easy-to-understand manner.

ISO 15118: The Communication Standard for EV Charging

ISO 15118, also known as the "Road vehicles -- Vehicle to grid communication interface" standard, defines the communication protocol for bi-directional power transfer between EVs and charging stations. It sets the framework for plugging in, authentication, and secure communication between the vehicle and the charging infrastructure.

This standard focuses on improving the efficiency, safety, and convenience of EV charging. It enables intelligent charging interactions by allowing the vehicle and charging station to exchange information such as charging capabilities, battery status, and user preferences. ISO 15118 aims to create a seamless and automated charging process.

OCPP: The Universal Language of Charging Stations

The Open Charge Point Protocol (OCPP), on the other hand, is a widely adopted open communication standard for managing and controlling EV charging infrastructure. OCPP provides a standardized language that allows different charging stations and central management systems to communicate with each other.

With OCPP, charging station operators can remotely monitor and control their charging infrastructure with ease. It covers various functionalities including start/stop charging, transaction handling, and tariff management. OCPP ensures interoperability between different charging equipment providers and central systems, ensuring that EV drivers have a seamless experience regardless of the charging station's brand or model.

Differences: Protocol vs. Communication Interface

The fundamental difference between ISO 15118 and OCPP lies in their scope and purpose. ISO 15118 focuses on the communication interface between EVs and charging stations, enabling secure and convenient interactions during the charging process. In contrast, OCPP provides a common language that enables communication between charging infrastructure components (charging stations, management systems, etc.) to ensure smooth operation and control.

In simpler terms, ISO 15118 is like the conversation between the EV and the charging station, facilitating an optimized charging experience for the vehicle and user. On the other hand, OCPP acts as the translator that allows all the components of the charging network to understand each other's commands and data.

While ISO 15118 and OCPP serve different purposes, they are complementary and work together to create a seamless and efficient ecosystem for electric vehicle charging.

In conclusion, understanding the difference between ISO 15118 and OCPP is crucial for the development and implementation of reliable and interoperable charging solutions. ISO 15118 focuses on communication between EVs and charging stations, whereas OCPP ensures communication between different charging infrastructure components. Both standards contribute to enhancing the overall EV charging experience and driving the widespread adoption of electric vehicles.