SIST EN ISO 15118-20:2022 PDF

Overview

EN ISO 15118-20:2022 (ISO 15118-20:2022) specifies the 2nd generation network layer and application layer requirements for vehicle-to-grid (V2G) communication between an electric vehicle (EV) - including BEV and PHEV - and electric vehicle supply equipment (EVSE). The standard defines message formats, sequence requirements and timing to support bidirectional power transfer, IP-based communication between the EV communication controller (EVCC) and supply equipment communication controller (SECC), and both conductive and wireless charging scenarios. EN ISO 15118-20 supersedes EN ISO 15118-2:2016 and expands security, transport, presentation and application-layer services for modern smart charging.

Key Topics

• V2G application messages and sequencing: normative definitions of requests, responses, headers, error handling and session flows to enable reliable charging, renegotiation and service selection.
• Network & transport requirements: IP-based communication, TCP/UDP handling, reference to applicable RFCs and protocol parameter constraints.
• Security and certificate management: TLS usage, certificate and key lifecycle, root certificate requirements, cryptographic key protection and random number generation.
• Presentation layer formats: XML and Efficient XML Interchange (EXI) usage and message security at the presentation layer.
• Data link & WLAN security: requirements for secure data link handling for both wired and wireless (WLAN / wireless power transfer) communications.
• Bidirectional and wireless charging support: messages and timing for power transfer in both AC/DC conductive charging and wireless power transfer (WPT), including Automatic Connection Device (ACD) support.
• Discovery & service selection: SECC discovery protocols, supported application protocols and VAS (value added services) association.
• Timing & synchronization: V2G message synchronization with IEC signaling (e.g., IEC 61851-1, IEC 61980-2) and precise timing constraints for charging sequences.

Applications

Who uses EN ISO 15118-20:

• EV OEMs implementing EVCC software stacks and secure communication features.
• EVSE manufacturers and charge point operators (CPOs) building SECC implementations, bidirectional chargers and roaming-capable services.
• Software developers and system integrators creating charging management platforms, V2G services and firmware.
• Cybersecurity teams and test labs validating TLS, certificate profiles and message security.
• Standards bodies and policymakers aligning regulatory frameworks for smart charging and interoperability.

Practical use cases include secure plug-and-charge, smart grid integration, vehicle-to-home (V2H) and vehicle-to-grid (V2G) energy services, and interoperable wireless charging deployments.

Related Standards

• ISO 15118-2 (superseded)
• IEC 61851-1 (charging signaling)
• IEC 61980-2 (wireless power transfer signaling)
• Relevant IP/TCP/UDP/TLS RFCs and certificate infrastructure standards

Keywords: ISO 15118-20, EN ISO 15118-20:2022, V2G, vehicle-to-grid communication, EV charging communication, EVCC, SECC, bidirectional charging, EVSE, smart charging.