'Clearness index of the best clear daysis very high' problem

'Clearness index of the best clear daysis very high' problem

Postby Solarian » Wed Jun 21, 2017 9:24 am

Hi,

I have a Ktcc value problem. As you see the attachment value is starting from 1.6 . I guess it should be around 1.1 . Attach file is for first half of 2017 and from meteocontrol datalogger. I can not understand why ktcc is very high in my ASCII datas. Could you please give me an advice regarding problem?

Thanks

BR
Onur Gunes
Attachments
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problem screen
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Re: 'Clearness index of the best clear daysis very high' problem

Postby André Mermoud » Fri Jun 23, 2017 3:27 pm

This means that your data are not correct.
It could be a problem of units, or more probably the calibration of the solarimeter.
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Re: 'Clearness index of the best clear daysis very high' problem

Postby jorgelbachiller » Wed Feb 07, 2018 8:09 pm

Hi,

I have the same problem with the clearness index and I have check the calibration and the units.

This data come from a wheather station which is weekly maintenance because we are alse checking the soiling on syte project. I have import this data asPVsyst standard format. (GHI and temperature)

The weather station has two horizontal pyranometers and other one on the inclined plane. Moreover, I have 2 panel which are checking the soiling, one photo cell. All of the have a normal range of irradiance.
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