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PostPosted: Sat Apr 13, 2019 12:17 am 

Joined: Sat Apr 13, 2019 12:02 am
Posts: 2
Hello,
I'm simulating in a northern region of Chile, about 1300m above sea level, and when I try to input manually the irradiation data from local meteorological institute (Explorador Solar) to register a geographical site, PVsyst gives me the following error:

"April : this value of global irradiation corresponds to an irrealistic clearness index Kt=0.84"

...and for some other months as well.

Do you think the data is wrong or is it a bug..? If the latter is the case, how to solve it?


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PostPosted: Wed Apr 17, 2019 9:41 am 
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Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1589
The irradiation conditions in the nord of Chile are really exceptionnal (due to altitude and very dry weather).

You should increase the limit for this warning in the Hidden parameters, topic "Sites and Meteo", item "Upper limit for monthly clearness index"


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PostPosted: Wed Apr 17, 2019 3:45 pm 

Joined: Sat Apr 13, 2019 12:02 am
Posts: 2
Hello,

Sorry that I haven't checked the FAQ before.
So, now I changed the default limit value in the Preferences>Edit hidden parameters, but now the error appears in the Project's designation panel of the Project Design menu:

Invalid meteo file:
The Clearness index of the best clear days is very high with respect to the clear day model. Check the values with the "Best clear day Ktcc" graph.

I checked the Best clear day Ktcc graph and nothing happens.
Could you please tell me what to do?
Thank you in advance.


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