EVCC and SECC Testing: ISO 15118, CCS Communication and OCPP Boundaries
A clear EV-to-charger communication guide covering EVCC, SECC, PLC, ISO 15118, test cases and back-end integration.
Who communicates with whom
The EVCC is the electric vehicle communication controller; the SECC is its charging-infrastructure counterpart. Communication between vehicle and charge point is separate from OCPP communication between charger and management system. A successful backend handshake does not prove vehicle interoperability.
PLC and the charging session
CCS commonly uses power-line communication on the control pilot to exchange higher-level charging messages. Confirm supported ISO 15118 and DIN SPEC 70121 behavior, version negotiation, isolation and failure handling for the intended vehicle pool.
Plug & Charge and certificates
Automated authorization can involve certificate-based trust, PKI lifecycle and vehicle/charger support. Do not confuse a certificate used for Plug & Charge sessions with the product compliance certificate or a station vendor declaration.
Interoperability testing
Design a matrix spanning vehicle makes, voltage ranges, temperature, retries, unplug events, abnormal sessions and firmware versions. Include communication traces and recovery outcomes, not just a pass/fail photo.
Backend and CSMS integration
Check OCPP version, security profile, remote start/stop, transaction records, diagnostics and monitoring. Where available, official OCPP certification is model/version/profile specific; separate it from ISO 15118 interoperability tests.
Procurement evidence
Ask for protocol implementation statements, software release notes, test coverage, traceability of failures, supported vehicle families and procedures for field updates.
Key takeaways
- Engineering guidance rather than a claim of certification, current inventory or compatibility with every vehicle.
Primary references
Educational content, not installation or legal advice. Check current standards and local requirements.
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