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System Advisor Model (SAM)

P50/P90 simulation error

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sericabo
Topic Author

24 Aug 2021 20:49 #9989 by sericabo

P50/P90 simulation error was created by sericabo

when I do the simulation it gives me the following error:
"Calculated negative diffuse horizontal irradiance" I would like to know if this is really an error or it only appears because I am using GHI and DNI as data I attach a couple of files of the historical data that I am using:

File Attachment:

File Name: -5.170556_...24-2.csv
File Size:255 KB

File Attachment:

File Name: -5.170556_...8-24.csv
File Size:258 KB

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pgilman

25 Aug 2021 15:35 #9994 by pgilman

Replied by pgilman on topic P50/P90 simulation error

Hi Sergio,

That error message tends to be for time steps at the beginning and end of the day when the sun is low on the horizon and the array is not producing very much power. If that is the case for you, then you can ignore the messages because the problem does not have a large impact on the total monthly or annual energy value.

Best regards,
Paul.

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