Bifacial simulation

[Bakhtiyar]

Hello, colleagues.

Has anyone ever encountered this problem?

My bifacila module configuration gives this error but I have the same row size everywhere.

Help, please.

[Muhammed Sarikaya]

Dear Bakhtiyar,

 

Go to "Settings - Edit Advanced Parameters" as shown below:

Then, in the search box, type "bifacial" and modify the highlighted parameter as shown:

This modification should resolve your issue.

Regards,

 

 

[Bakhtiyar]

16 minutes ago, Muhammed Sarikaya said:

Dear Bakhtiyar,

 

Go to "Settings - Edit Advanced Parameters" as shown below:

Then, in the search box, type "bifacial" and modify the highlighted parameter as shown:

This modification should resolve your issue.

Regards,

 

 

Thanks a lot for your help, can you tell me what this value means and how much it should be according to the rule?

[Muhammed Sarikaya]

Dear Bakhtiyar,

This parameter is a threshold for the RMS value of the pitch distribution that PVsyst finds in the 3D drawing.

The bifacial models in PVsyst are an approximation that is valid for identical long rows with constant pitch (spacing). If the simulation uses a 3D drawing of the PV system, then PVsyst will check if this drawing comes close to this idealization. For this purpose, it will calculate the RMS of the pitch distribution, and if it finds a value larger than the threshold, it will issue an error message, and the simulation will not be possible.

The default value of 0.1 m is not based on a specific study. The error message is meant to remind the user that the system which is being simulated, is not fully compatible with the idealized assumptions, and therefore an additional uncertainty of the bifacial contribution in the simulation results is to be expected.

So far there is no study that quantifies the increase of uncertainty in the simulation results as a function of the RMS of the pitch distribution. It will become possible to address this, once we have a more sophisticated bifacial model, which will be based on the 3D drawing. This is in work and will still require several months of development.

Regards,