Meter Values

Source: OCPP 2.0.1 Part 2 — Specification (Edition 2, 2022-12-15) — Section 1.32 (Messages); Use Case J01 — Sending Meter Values not related to a transaction (Functional Block J. MeterValues)

Overview

The Charging Station sends MeterValuesRequest to deliver one or more sampled meter readings not related to a transaction. For meter values inside a transaction, the CS uses TransactionEvent instead (use case J02).

NOTE (from spec): This message might be removed in a future version of OCPP — it will be replaced by Device Management Monitoring events (NotifyEvent).

Each meterValue element contains a timestamp plus one or more sampledValue entries (measurand, context, location, phase, unit, format, signature for signed metering).

Sequence Diagram

Charging Station  ──── MeterValuesRequest ────▶  CSMS
                       (evseId, meterValue[])
Charging Station  ◀─── MeterValuesResponse ────  CSMS

Initiator

Charging Station → CSMS

Fields

Examples

{
  "evseId": 0,
  "meterValue": [
    {
      "timestamp": "2026-04-27T12:34:56Z",
      "sampledValue": [
        {
          "value": 12500.0,
          "context": "Sample.Periodic",
          "measurand": "Energy.Active.Import.Register",
          "unitOfMeasure": { "unit": "Wh" }
        }
      ]
    }
  ]
}

{}

Schema

Source: schemas/MeterValuesRequest.json, schemas/MeterValuesResponse.json (OCPP 2.0.1 FINAL)