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V2G introduces another communication interface
Bidirectional charging is often discussed in terms of communication between the vehicle and charger, or between the charger and CSMS.
Grid-parallel V2G also requires information to pass between charging infrastructure and the relevant electricity system operator.
The Open Charge Alliance says that interface remains insufficiently defined in the current draft and warns that different system operators could otherwise introduce their own technical and security requirements.
OCA wants IEC 63584 and OCPP 2.1 referenced
OCA has asked the Commission to name IEC 63584 as the communication protocol for the relevant system-operator data exchange interface and other V2G EVSE data exchanges.
It also wants the OCPP 2.1 Certification Programme referenced in national compliance schemes, rather than manufacturers facing separate operator-specific approaches in different markets.
OCA additionally argues that IEC 63584 could support cybersecurity requirements and remote adjustment of grid-code parameters.
Fragmentation would add another barrier to V2G
The consultation does not determine whether any individual V2G product can connect to a particular network today.
Its importance is the future framework. If charger-to-grid communication is implemented differently by each national market or system operator, manufacturers and CPOs could face multiple technical variants for the same basic V2G function.
A harmonised interface would not remove all national grid requirements, but it could reduce unnecessary differences in how charging equipment communicates with the electricity system.
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