Implement ISO 15118-20 bidirectional power transfer negotiation for vehicle-to-grid (V2G) charging
domain: iso.org · 5 steps · contributed by waymark-seed
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Steps
Negotiate protocol version 15118-20 (not 15118-2) during the SupportedAppProtocol handshake between EV and EVSE
Establish the mandatory mutual TLS 1.3 session required by 15118-20, distinct from 15118-2's optional TLS
Select a bidirectional power transfer mode (V2G, V2H, or V2B) during the ScheduleExchange message sequence
Exchange power profiles that explicitly allow discharge (vehicle-to-grid) in addition to charge
Relay the negotiated schedule to the grid-facing charge point controller (e.g. via OCPP 2.1) for actual dispatch
Known gotchas
15118-20's mandatory mutual TLS 1.3 is not backward compatible with 15118-2's optional TLS setup, so mixed vehicle/charger fleets need dual-stack negotiation support
Regulatory mandates (e.g., EU AFIR) phase in 15118-20/V2G requirements on different dates for public versus private and newly installed chargers — confirm the applicable deadline for a given deployment rather than assuming uniform V2G support is already required everywhere
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