EN ISO 15118-3 defines the physical layer and data link layer requirements for wired vehicle-to-grid (V2G) communication between electric vehicles (BEV/PHEV) and charging infrastructure (EVSE). It applies to manually connected conductive charging using EVSEs that support high‑level communication (specifically IEC modes 3 and 4). The part covers low‑layer communication architecture, information exchange between actors in the energy transfer, and interfaces needed to support higher-layer V2G services.
Key topics and technical requirements
- Physical and data link layer scope - Requirements for establishing and maintaining a reliable wired communication channel between EV and EVSE.
- System architecture - OSI‑based services mapping, low‑layer communication module configuration, and identification requirements for EV and EVSE.
- Connection coordination - Procedures for plug‑in, initialization, sleep/wake‑up, loss of communication and plug‑out phases to ensure safe charging sessions.
- Matching and network setup - Discovery of compatible low‑layer modules, validation of matching decisions, logical network formation and error handling.
- Timing and constants - Defined timings and protocol constants relevant to link establishment and state transitions.
- EMC and signal coupling - Electromagnetic compatibility criteria and recommended signal coupling approaches for robust operation.
- Layer 2 interfaces - Data Service Access Points (SAP), data link control SAP to layer 3 interfaces and interoperability requirements.
- Profiles and annexes - Includes a normative annex on HomePlug Green PHY over control pilot and an informative annex on IEEE 1901.2 G3‑PLC profiling for the control‑pilot line.
Practical applications and who uses this standard
- EV OEMs and Tier‑1 suppliers - Implement compliant on‑board communication modules to ensure interoperability with public and private chargers.
- EVSE and charging station manufacturers - Design physical interfaces and data‑link firmware that conform to timing, EMC and signaling requirements.
- Charging network operators & utilities - Ensure networked chargers can reliably communicate with vehicles for smart charging and V2G services.
- Test laboratories & certification bodies - Develop conformance and interoperability tests based on the layer‑2/physical requirements.
- System integrators & software developers - Integrate low‑level communication stacks with higher‑layer ISO 15118 services (authentication, billing, smart charging).
Related standards
- ISO 15118 (other parts): Part 1 (use cases) and Part 2 (network & application protocols) - complements Part 3 by defining higher‑layer protocols and use cases.
- Relevant IEC basic signalling standards (modes 3 and 4) - Part 3 is intended to work alongside applicable IEC conductive charging signalling documents.
Keywords: ISO 15118-3, EN ISO 15118-3:2016, vehicle-to-grid, V2G, EV charging communication, EVSE, physical layer, data link layer, HomePlug Green PHY, IEEE 1901.2, control pilot, EV interoperability.
