Rafael Santos Posted January 22, 2016 Share Posted January 22, 2016 Hi Mermoud,I imported a TMY from an hourly-based ascii file. The file contains only global horizontal irradiance and temperature values. When I checked the quality of the data, PVsyst said it seems to be ok, although it suggested me a time shift of 13 minutes (no logycal reason for that, since my data is hourly-based). My dataset has timestamps indicating the beggining of the dataset, the same way PVsyst works (I suppose), so I guess this is not the problem here.Somehow I am getting very high values of Normal Beam Irradiance (close to 1400 W/m²) at the beginning of the days in some days of January, March, April, October and November. I attatched a print of January 24th, as an example. (GlobHor in yellow, DiffHor in red, BeamHor in black and BeamNor in blue).I am pretty sure this is the reason why I am having big shading losses, as I am using tracker, and the beginning/end of the day has most losses.Thanks for the attention, and regards,Rafael Link to comment Share on other sites More sharing options...
André Mermoud Posted January 23, 2016 Share Posted January 23, 2016 This is typically a problem of time shift between the recording time of your data and the time of PVsyst (i.e. when the solar geometry is calculated). Please see the help In V 6.40: "Meteo Database > Notes on Meteo > Meteonote9_Time shift in meteo files" In V <= 6.39: "Meteorological Data > Hourly Meteorological Data > Time shift" Link to comment Share on other sites More sharing options...
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