Near shading simulation options

[Luca Vignoni]

Is there a detailed guidance on the differences between the "fast (table)" option and the "slow simulation" option for the near shading? In order to understand possible deviance and what is best for the project.

Thanks

[Linda Thoren]

Hi,

The execution of the shading factor calculation may take some time, and has to be evaluated at each simulation hour. For speeding-up the simulation execution, we calculate a table of shading factors for specific sky orientations (every 10° in tilt and 20° in azimuth). Then at each step, the simulation can calculate the exact sun's position, and interpolate in this table ("Fast" shadings calculation"). This table is also used for the elaboration of the shading factor on diffuse and on albedo integrals.

You find more details in our help, for instance the treatment of the Beam component:
https://www.pvsyst.com/help/project-design/shadings/calculation-and-model/treatment-of-the-beam-component.html

and the shading factor table:
https://www.pvsyst.com/help/project-design/shadings/calculation-and-model/shading-factor-table.html

Kind regards