Meter Values

The Meter Values are the readings from the Charge Station from a number of properties.

For more information and navigation on Diagnostics in general, please visit this article: Charge Station Diagnostics page

Main use cases:

Understand whether the Charge Station is sending Meter Values at all (no meter values would not update e.g. Apps for ongoing session information)

Analyzing MeterValues

Hovering over the Payload will show the Meter Value payload.

Key components are:

As specified by OCPP, there can be various Units sent along a Meter Value, however there are 4 common ones:

If a Charge Station has 3 phases, it will send four Meter Values, one for each phase and the cumulative of the Charge Station:

OCPP defines different measurands that can be passed on through meter values.

The key value in most cases is the Energy.Active.Import.Register or simply 'Energy (consumed)" as represented in the EvPortal.

Value Description	Description	Used in GFX
Current.Export	Instantaneous current flow from EV
Current.Import	Instantaneous current flow to EV	Yes
Current.Offered	Maximum current offered to EV
Energy.Active.Export.Register	Energy exported by EV (Wh or kWh)
Energy.Active.Import.Register	Energy imported by EV (Wh or kWh)	Yes
Energy.Reactive.Export.Register	Reactive energy exported by EV (varh or kvarh)
Energy.Reactive.Import.Register	Reactive energy imported by EV (varh or kvarh)
Energy.Active.Export.Interval	Energy exported by EV (Wh or kWh)
Energy.Active.Import.Interval	Energy imported by EV (Wh or kWh)
Energy.Reactive.Export.Interval	Reactive energy exported by EV. (varh or kvarh)
Energy.Reactive.Import.Interval	Reactive energy imported by EV. (varh or kvarh)
Frequency	Instantaneous reading of powerline frequency	Yes
Power.Active.Export	Instantaneous active power exported by EV. (W or KW)
Power.Active.Import	Instantaneous active power imported by EV. (W or KW)	Yes
Power.Factor	Instantaneous power factor of total energy flow	Yes
Power.Offered	Maximum power offered to EV	Yes
Power.Reactive.Export	Instantaneous reactive power exported by EV. (var or kvar)
Power.Reactive.Import	Instantaneous reactive power imported by EV. (var or kvar)
RPM	Fan speed in RPM	Yes
SoC	State of charge of charging vehicle in percentage	Yes
Temperature	Temperature reading inside Charge Point.	Yes
Voltage	Instantaneous AC RMS supply voltage	Yes

Meter Value 'Reading Context'

Meter Values can be sent by the Charge Station at different moments.

Typically there are Meter Values at the beginning and end of a Transactions:

Meter Values can be sent based either:

Sample.Clock - meter values are sent every clock aligned interval, e.g. every 15mins, regardless of an ongoing transaction or not.

Value	Description
Interruption.Begin	Value taken at start of interruption.
Interruption.End	Value taken when resuming after interruption.
Other	Value for any other situations.
Sample.Clock	Value taken at clock aligned interval.
Sample.Periodic	Value taken as periodic sample relative to start time of transaction.
Transaction.Begin	Value taken at end of transaction.
Transaction.End	Value taken at start of transaction.
Trigger	Value taken in response to a TriggerMessage.req