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Self-consumption terms
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Create terms for self-consumption chart
Create all self-consumption terms to display the Self-consumption chart. VCOM’s default term definitions are based on two default system setup scenarios.
Prerequisites
Default setup A: System has no battery
Energy generation term
E_Z_EVUis defined.Grid connection meter is set up and provides power values (data point
M_AC_P).
Default setup B: System has a battery that is not connected to the grid
Energy generation term
E_Z_EVUis defined.Grid connection meter is set up and provides power values (data point
M_AC_P).The battery is set up and provides power values (data point
B_P_AC).The battery only charges from PV production and discharges to the load.
Steps
At
SYSTEM LEVEL, go to 
System configuration > 
Calculations > Terms.In the area Self-consumption, select
Create terms.
In the appearing window, select your system’s grid connection Meter.
Select
Save.
Results
Now, all the necessary terms are created automatically with their default definitions and the Self-consumption chart appears at SYSTEM LEVEL in the Evaluation tab.
Caution
If your system setup differs from the default setups, you may need to edit the default term formulas so that the self-consumption chart is displayed correctly. This applies in particular to the respective battery terms if your battery is connected to the grid or if you have further technology and meters to track energy origin and destination.
Default setup A: System has no battery
New terms:
Energy export to the grid:
M_AC_E_EXPEnergy import from the grid:
M_AC_E_IMPSelf-consumption:
M_AC_E_OWN
= Difference between generated and fed-in/grid-exported energyE_Z_EVU - M_AC_E_EXPTotal consumption:
M_AC_E_CON
= Sum of self-consumed and grid-imported energy:M_AC_E_OWN + M_AC_E_IMP
Default scenario A: System has no battery
Default setup B: System has a battery that is not connected to the grid.
New terms:
Energy export to the grid:
M_AC_E_EXPEnergy import from the grid:
M_AC_E_IMPBattery energy charge:
B_E_CHARGEBattery energy discharge:
B_E_DISCHARGESelf-consumption:
M_AC_E_OWN
= Energy from PV generation and battery discharge that directly covers the load, excluding any grid imports.(E_Z_EVU – M_AC_E_EXP – B_E_CHARGE) + B_E_DISCHARGETotal consumption:
M_AC_E_CON
= Sum of self-consumed and grid-imported energy:M_AC_E_OWN + M_AC_E_IMP
Default scenario B: System has a battery that is not connected to the grid
Further actions
Recalculate all terms to update your data. See Recalculation of terms.
Use the newly created terms for user-defined alarms or in user-defined charts. See User-defined alarms or Create and save user-defined charts with the chart generator.
Create battery terms after the initial creation of the self-consumption terms
Caution
This procedure will overwrite all existing self-consumption terms with their default definitions.
If you have user-defined self-consumption terms, do not follow this procedure. Instead, do the following:
Create two new terms with exactly the following abbreviations and your own formulas:
B_E_CHARGEfor Battery energy chargeB_E_DISCHARGEfor Battery energy discharge
Ensure to include the battery terms in your user-defined formulas for the self-consumption term
M_AC_E_OWNaccording to your system setup and your desired chart behavior.
Follow these steps if you already use the default self-consumption terms and now only want to add the terms for Battery energy charge and Battery energy discharge.
Prerequisites
The battery is set up and provides power values (data point
B_P_AC).The battery only charges from PV production and discharges to the load.
Steps
At SYSTEM LEVEL, go to
System configuration > Calculations > Terms.In the area Self-consumption, select
Delete in the header of the area and confirm your action. All existing terms for the self-consumption chart will be deleted.Then, select
Create terms again to recreate all terms with their default definitions.
The self-consumption terms now also include the battery terms and they appear in the list of terms and in the Self-consumption chart.