Notify EV Charging Needs

When an EV connects via ISO 15118 and communicates its charging needs, the Charging Station forwards those needs to the CSMS using NotifyEVChargingNeedsRequest. This enables Central Smart Charging…

Source: OCPP 2.0.1 Part 2 — Specification (Edition 2, 2022-12-15) — Section 1.36 (Messages); Use Case K15 — Charging with load leveling based on High Level Communication (Functional Block K. SmartCharging)

Overview

When an EV connects via ISO 15118 and communicates its charging needs, the Charging Station forwards those needs to the CSMS using NotifyEVChargingNeedsRequest. This enables Central Smart Charging based on EV-supplied parameters (preferred energy, departure time, AC/DC parameters, etc.).

The CSMS responds with a status indicating whether it could process the message — but the response does not imply that the charging needs can be met given the current charging profile.

Sequence diagram

1Charging Station  ──── NotifyEVChargingNeedsRequest ────▶  CSMS
2                       (evseId, chargingNeeds, maxScheduleTuples?)
3Charging Station  ◀─── NotifyEVChargingNeedsResponse ────  CSMS
4                       (status, statusInfo?)

Initiator

Charging Station → CSMS

Fields

Field Name	Field Type	Card.	Description
maxScheduleTuples	integer	0..1	Optional. Maximum schedule tuples the car supports per schedule.
evseId	integer (> 0)	1..1	Required. EVSE/connector to which the EV is connected. May not be 0.
chargingNeeds	ChargingNeedsType	1..1	Required. The characteristics of the energy delivery required.

ChargingNeedsType (selected fields)

Field	Type	Card.	Description
requestedEnergyTransfer	EnergyTransferModeEnumType	1..1	`AC_single_phase` / `AC_three_phase` / `DC` / etc.
departureTime	dateTime	0..1	Estimated departure time of the EV.
acChargingParameters	ACChargingParametersType	0..1	AC charging parameters (energyAmount, voltage, current).
dcChargingParameters	DCChargingParametersType	0..1	DC charging parameters (max current/voltage/power, etc).