VCOM - Creation of Self-consumption chart

    Step by step guide

    Requirements:
    There must be a meter in the system that provides values for imported and exported power.



    1. Open the abbreviation overview by clicking on the button "?" and look there for the abbreviations for the corresponding counter, which returns the following values:

      - Energy generated per interval (sourced)
      -       Energy generated per interval (supplied)



      Leave the window open and then copy the content of the respective line from the "Term" column in the next step.

    2. Set up the term calculations as follows:

      Designation

      Abbreviation

      Type

      Unit

      Formula

      Generated Power

      E_Z_EVU

      Sum

      kWh

      'E_INT' (Should be already existent)

      Imported Energy

      M_AC_E_IMP

      Sum

      kWh

      'MET(SNxxxxxx)-M_E_INT_IMP' (Term from step 1)

      Exported Energy

      M_AC_E_EXP

      Sum

      kWh

      'MET(SNxxxxxx)-M_E_INT_EXP' (Term from step 1)

      Own Consumption

      M_AC_E_OWN

      Sum

      kWh

      'E_Z_EVU' - 'M_AC_E_EXP'

      Consumption

      M_AC_E_CON

      Sum

      kWh

      'M_AC_E_IMP' + 'M_AC_E_OWN' (not necessary for chart)

    3. Select Recalculation of terms and enter the period for which the newly created terms are to be recalculated.
      Select the period for which all the necessary meter data is available. If the recalculation-period exceeds 1 year, you have to initiate another recalculation.

      After the recalculation has been completed, you should now find a corresponding graphic under Evaluation -> System -> Self consumption:


      If the graphic or the Self-consumption menu item is not displayed after the recalculation has been completed, please reload the page in your browser with CTRL+F5.
      Please check the displayed values again for correctness.

    What to do if?

    My self-consumption graph is wrong, the purchase and feed-in are wrong

    In some cases it can happen that the counter arrow direction on the used data logger or counter has been incorrectly configured. An incorrectly connected current transformer then also causes reversed values for import and export. The result is that the self-consumption graph is also incorrectly calculated.

    Solution:
    a) Correct the incorrect configuration on data logger or meter, or connect the current transformer in the correct direction.
    b) Alternatively, you can swap the terms for import and feed-in accordingly:

    M_AC_E_IMP ->  'MET(SNxxxxxx)-M_E_INT_EXP'
    M_AC_E_EXP ->  'MET(SNxxxxxx)-M_E_INT_IMP'

    Then recalculate the terms again.

    My counter does not provide any interval energy values

    Some meters do not provide interval values for imported and exported energy, instead the calculation can be made based on the AC power in most cases. This step can also be used if the meter provides partially erroneous energy values (peaks).

    Solution:
    As in step 1, check if the meter gives values for AC power instead:

    Create or modify the terms for the calculation as follows:

    • In each case, copy the formula below into the formula editor.
    • Then copy the meter serial number (SNxxxxxx) from step 1 and use it to replace all (SNxxxxxx) that appear in the formula.

    Abbreviation

    Formula

    M_AC_E_IMP

    ('MET(SNxxxxxx)-M_AC_P'<0)*('MET(SNxxxxxx)-M_AC_P'/-((3600/'MET(SNxxxxxx)-INTERVALL')*1000))

    M_AC_E_EXP

    ('MET(SNxxxxxx)-M_AC_P'>0)*('MET(SNxxxxxx)-M_AC_P'/((3600/'MET(SNxxxxxx)-INTERVALL')*1000))

    Published