IEC 61851-24-2023 PDF

Full title and description

Electric vehicle conductive charging system - Part 24: Digital communication between a DC EV supply equipment and an electric vehicle for control of DC charging. This document specifies the digital communication requirements and descriptions used to control conductive DC power transfer between a DC EV supply equipment (EVSE) and an electric road vehicle, and includes Annexes describing communications for DC charging system types A, B and C.

Abstract

IEC 61851-24:2023 (second edition) defines the digital communication interface used during DC conductive charging (Mode 4) between EV supply equipment and an EV. It updates and replaces the 2014 edition, aligning annexes and communication descriptions with the revisions in IEC 61851-23:2023 and other relevant documents to support safe and interoperable DC charging control.

General information

• Status: Published / International Standard (active).
• Publication date: 13 December 2023.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 43.120 (Electric road vehicles).
• Edition / version: 2.0 (Second edition, cancels and replaces IEC 61851-24:2014).
• Number of pages: Approximately 111 pages (page counts may vary by national adoption/format).

Scope

Applies to digital communication between a DC EV supply equipment and an electric road vehicle for control of conductive DC power transfer with rated supply up to 1 000 V AC or up to 1 500 V DC and a rated output voltage up to 1 500 V DC. The document is intended for use together with IEC 61851-23 and includes Annex A/B/C descriptions specific to DC charging system types A, B and C. It covers control and signalling functions necessary to manage a DC charging session in Mode 4.

Key topics and requirements

• Digital communication interface and message descriptions for DC conductive charging (Mode 4).
• Control and coordination of DC power transfer between EVSE and EV (session start/stop, charge parameters, safety interlocks as related to communication sequences).
• Definitions and descriptions for system types A, B and C provided in Annex A, B and C (updated to align with IEC 61851-23:2023).
• Interoperability considerations to enable consistent behavior across equipment from different manufacturers.
• Technical revision and alignment with related parts of the IEC 61851 series; normative references and update of annex material from the previous edition.

Typical use and users

Used by EVSE manufacturers, electric vehicle designers, charging network operators, test laboratories, conformity assessment bodies, and standards developers to implement, test and verify DC charging communication and control functions for interoperable and safe DC charging systems.

Related standards

Closely related to other parts of the IEC 61851 series (notably IEC 61851-23) and to vehicle‑to‑grid/charging communication standards such as the ISO 15118 family; national/adopted EN/DIN/SS versions may exist for regional application.

Keywords

IEC 61851-24, DC charging, EVSE, electric vehicle, digital communication, Mode 4, DC conductive charging, interoperability, charging protocol.

FAQ

Q: What is this standard?

A: IEC 61851-24:2023 is an international standard that specifies the digital communication between DC EV supply equipment and electric vehicles for controlling DC conductive charging sessions.

Q: What does it cover?

A: It covers the communication interface, message descriptions and annexed examples for controlling DC power transfer (Mode 4), including provisions for system types A, B and C and updates aligned with IEC 61851-23:2023.

Q: Who typically uses it?

A: EVSE manufacturers, EV OEMs, charging-network operators, testing and certification bodies, and standards committees use it to implement and verify DC charging communication and interoperability.

Q: Is it current or superseded?

A: The 2023 edition is the current (second) edition and cancels and replaces the 2014 edition. Stability date listed by the IEC for this edition is 2026.

Q: Is it part of a series?

A: Yes — it is Part 24 of the IEC 61851 series (Electric vehicle conductive charging system). It is intended to be used together with other parts of the series, notably IEC 61851-23 for DC charging system requirements.

Q: What are the key keywords?

A: DC charging, EVSE, EV, digital communication, charging protocol, Mode 4, interoperability, IEC 61851-24.