Necessary steps while using actual measured data for PVsyst.

[bommu]

Initially, I generated a PVsyst report for one project using the Meteonorm data.

For the same project, Now i have one year of actual measured GII (instead of GHI) and module temperature (instead of ambient temperature) data. Please suggest the necessary initial steps to be adopted while using this actual measured data for the existing project.

[Linda Thoren]

Hello,

It is possible to import measured data through the databases window, Custom file. Choose your file, define your site and click New to construct the format file. For measured Global Inclined Irradiance, or Plane of Array Irradiance, choose the Measured global on plane variable GlPMeas and define the orientation definition and albedo. Measured POA irradiance import uses HAY transposition model. Make sure that the simulation is also performed with Hay transposition model to ensure consistent POA. You change the transposition model in the Project settings, Design conditions tab. 

The module temperature should be imported as the variable TArrMes - measured module temperature. If you do not have any measurements for the ambient temperature, ambient temperatures will synthetically be generated from another source and this function seems to not work correctly. When running the simulation, in the detailed losses window, thermal parameters tab, make sure you tick the option Use Measured Array Temperature and the synthetically generated ambient temperature will not be an issue for the thermal losses. 

Kind regards