Why these two values are different

[lhr]

Dear pvsyst team,

Hi,for the same item,Why these two values are different.

How Globhor was transformed into Globinc?

[Linda Thoren]

Dear Ihr,

The Global horizontal irradiation is transformed to global incident in collector plane by using a transposition model. You can read more about the transposition model in the following PVsyst help page:
https://www.pvsyst.com/help/physical-models-used/irradiation-models/transposition-model.html?h=transpositio

The Global on collector plane from the Quick optimization box in the orientation window is based on the clear sky model at your site and is not the result of the simulation but serves as a quick optimization to get an order of magnitude of the irradiance in the collector plane according the chosen tilt and azimuth. The GlobInc in the report is the result of the simulation based on the hourly weather data.