Missing Met Data in PVsyst

[lucydeanna]

Hi all,

From my understanding, any missing data in a MET file should be replaced with -99 (or less), and the missing values will be replaced by an average of the corresponding hour of the previous and next day. Attached is an example of how I am doing this.

After importing the met data and running the simulation, looking at the E_Grid output, I can see this value is just being treated as nighttime instead of an average. 

Any help appreciated, thank you.

[Auriane Canesse]

Unfortunately, it is impossible to extrapolate irradiance, missing data or invalid data (-99) will be set to 0. This is due to the intrinsic variability of the irradiance.
I will clarify our help page on this point.

[lucydeanna]

Thank you for your response. Can you please clarify what parameters the -99 does work for?

[Auriane Canesse]

-99 is an invalid value for all parameters. The extrapolation feature has been removed and any missing value will be treated as missing (0 irradiance). The help will be corrected in the next release. I apologies for the confusion.