SIST EN ISO 15118-21:2025 PDF

Overview

SIST EN ISO 15118-21:2025 (ISO 15118-21:2025) defines a conformance test plan for second‑generation vehicle‑to‑grid (V2G) communication interfaces. The document specifies an abstract test suite (ATS) for systems under test (SUT) implementing an electric‑vehicle communication controller (EVCC) or a supply‑equipment communication controller (SECC). Tests cover the common network‑layer and application‑layer requirements in ISO 15118‑20, independent of charging type (AC, DC, ACD, WPT). The standard focuses on protocol conformance across OSI layers 3–7 (network to application).

Key technical topics and requirements

• Abstract Test Suite (ATS): Defines capability (static) and behaviour (dynamic) tests that check observed SUT behaviour against the conformance requirements in ISO 15118‑20 and against implementer‑declared capabilities.
• Test architecture and adapters: Describes a test architecture and SUT adapters (e.g., IEC 61851‑1, ISO 15118‑3, ISO 15118‑8, ISO 15118‑20) and platform adapters used to exercise the SUT.
• OSI layers 3–7 coverage: Test cases focus on network and application‑layer functions (SDP, V2GTP, V2G message flows), codecs, timers and timeout handling.
• Test case format and management: Abstract test cases are presented in descriptive tabular format with test suite structure, test profiles, PICS/PIXIT definitions, test identifiers and verdict types.
• Normative scope: Coverage is limited to normative sections of ISO 15118‑20; referenced external standards (IETF RFCs, W3C Recommendations, etc.) are referred to only when necessary for conformance testing. The tests explicitly exclude assessment of performance, robustness, reliability or physical power‑flow behavior-power transfer is not a prerequisite for executing cases.

Practical applications

• Interoperability testing: Validate EV and EVSE implementations for protocol conformance to ISO 15118‑20 to improve interoperability across vendors and charging types.
• Product certification and compliance: Provide testable evidence for certification bodies and test laboratories that a device conforms to the specified network and application layer requirements.
• Development and verification: Used by firmware/software teams to verify EVCC/SECC protocol stacks, message flows (SDP, V2GTP, V2G SOAP/JSON flows) and timer handling before field deployment.
• Test tool and lab design: Serves as a blueprint for building test harnesses, simulators and reference test systems including template messages and test system functions.

Who should use this standard

• EV OEMs and charging-station manufacturers (EVCC/SECC implementers)
• Conformance test laboratories and certification bodies
• Software/firmware engineers working on ISO 15118 stacks
• Interoperability test event organizers and integrators
• Standards and regulatory stakeholders assessing V2G protocol compliance

Related standards and keywords

• Related: ISO 15118‑20, IEC 61851 series, referenced IETF RFCs and W3C Recommendations (as applicable)
• Keywords: ISO 15118‑21:2025, SIST EN ISO 15118‑21, vehicle‑to‑grid, V2G, EVCC, SECC, conformance test plan, abstract test suite, network layer, application layer, protocol conformance, interoperability, PICS, PIXIT.