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PostPosted: Mon Oct 01, 2018 1:38 pm 

Joined: Mon Oct 01, 2018 12:47 pm
Posts: 1
Location: Spain
Hi there,

I try to export horizontal global irradiation considering a specific clearness index of 0.815 as ASCII file from 'Advanced simulation'. I've modified the clearness index (Kt) for every month in 'site file > monthly meteo' but however, pvsyst seems to ignore these values and uses Meteo file's clearness index ('meteo file > view meteo site > monthly meteo'), which cannot be changed.

Any idea how can I modify clearness index on meteo file? Or how can pvsyst take into account monthly meteo's Kt instead?


File comment: Site file > monthly meteo
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PostPosted: Wed Oct 17, 2018 10:22 pm 
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Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1680
A monthly clearness index of 0.85 is considered as irrealistic by PVsyst.
The limit is fixed to 0.82, however you can change it in the "Hidden parameters", topic "Miscellaneous: Meteo, Simulation,...".

Now I have just tried to define the GlobHor in Kt units, and this works quite well: you can save your SIT file with these values.

NB: In the "Import Meteo data" section, you have the opportunity of creating a file of all Clear days for any location.

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