Choosing an RFID Credential for EV Charging

The important question is not which chip name appears on a card. It is what the charger reader actually reads and what the backend verifies. A card does not communicate with OCPP directly: the reader obtains an identifier or authenticates a supported application, and the charge point sends the resulting token to its management system.\n\n## Three credential models\n\nUID-only credentials expose a public identifier. They are widely supported, but the value should be treated as copyable; protection then depends on revocation, alerts, anomaly detection, limits and backend controls. Legacy sector-memory credentials add keyed sectors, but older cryptography may be unsuitable for a new charging programme. AES-authenticated credentials can support mutual authentication, protected files and diversified keys, but only where compatible readers authenticate the protected application and keys are managed securely. If a third-party charger reads only the UID, the same card functions there as a UID token.\n\n## Roaming and validation\n\nRoaming depends on token registration, identifier serialization, eMSP and CPO agreements, and the route through OCPI, OICP or another integration. It does not require one universal chip. Record reader models and firmware, UID length and byte order, supported authentication, key ownership, personalization data, backend format, target networks, material and operating conditions.\n\nApprove finished samples only after testing physical read performance and end-to-end authorization on representative chargers. A successful laboratory read is not the same as a successful charging session.\n\nRequest a sample set or contact ChargeRFID for a neutral specification and validation plan.