Arev factor of BC modules in string level simulation

[Chen]

Dear Prof.André Mermoud：
  

   Recently, I have utilized PVsyst 8.0.19 for simulating the IV curves of BC modules under module-level and string-level shading scenarios. 

Given some inconsistencies identified in the string-level results, I wish to arrange a discussion with you on this matter.

 

 I increased the Arev factor of BC module to over 1000, and first simulated cell shading at the module level with 1 cell shaded.  

The results showed a 35% power reduction.

When I used the string simulation tool to replicate the same number of shaded cells—i.e., a string configuration with 

one module per string and 1 cell shaded—the results displayed a significant discrepancy. 

  Does it a bug? Does the Arev factor of BC modules fail to take effect at the string level? 

 thanks! 

Best regards! 

 

 

[Luca Antognini]

Dear Jianguo Chen,

Thank you for your feedback.

I share your understanding : both dialogues, with those parameters, should lead to the same results. 
For me the correct plot is your top screenshot, from the menu "One shaded Module".

I noted that this problem seems to happen only with "Twin-half-Cut" module: If I select a "In length" module, both dialoguess give me the same results

I think therefore there is a problem with the calculation of the electrical layout in this specific dialog. I will create an issue to investigate it further and fix this problem in a future version.