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PR/Performance ratio chart

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Chart

View the chart at System level in the Evaluation tab in the Section: System KPIs.

PR, Performance ratio chart
PR/Performance ratio chart in Month view

Basic info

Description

 The performance ratio is calculated based on the actual generated energy (= system yield), installed DC power, and POAI/Plane-of-array irradiance. It indicates how well the PV system can convert solar energy. Typically, an annual PR value of 75-85% is considered good.

In the chart, the bars represent the system’s normalized actual energy (PV Yield) and the dots represent the PR/Performance ratio. The color of the dots corresponds to the threshold specified for the rating of the PR.

Prerequisites

  • Actual energy term E_Z_EVU is defined. See Terms.

  • Plane of array irradiance/POAI term G_M0 is defined. See Terms.

Further details

Calculation

  • The smallest period of the PR calculation is one day.

Editable calculation parameters

  • With the VCOM module KPI editor, you can:

  • Without the KPI editor, the standard formula is used.

Standard formula

The PR formula from IEC 61724-1 is used by default:

Default PR formula based on IEC 61724-1
Default PR formula based on IEC 61724-1


Caution

If your site has multiple power plant controllers (blue’Log XC data loggers or third-party PPCs) and you want to monitor each individually, each controller should be configured as a separate system, not as a subsystem. Otherwise, the performance ratio will not be calculated.

Example: A site has PV production across three rooftops, each with its own PPC. In this case, configure each rooftop in VCOM as a separate system.

To view the overall PR for the entire site, you can combine these individual systems into a virtual system in VCOM.

If you require further assistance, contact Support.

Note

Find further information on the general functions within charts under Evaluations & charts.