questios photovoltaic commercial

Dear Rei,

The latest version of your file looks good, and will result in a reasonable estimate of the effect of shading on the array output.

However, it does not make use of the 3D shade calculator's partial shading calculations, which work with crystalline Silicon modules, and can more accurately estimate the effect of partial shading of the array for modules with diodes. To make use of those calculations, you should replace each active surface in the 3D shading scene with a set of surfaces for each string in the subarray.

For example, for your file, on the System Design page in SAM, you can see that Subarray 1 has 5 strings, Subarray 2 has 4 strings, and Subarray 3 has 5 strings. To model that in the 3D shade calculator, you could replace the active surface for Subarray 1 with 5 smaller active surfaces. Assign the number 1 to the Subarray property for all five of those active surfaces, and assign the numbers 1-5 to the String property for each of those active surfaces. Similarly, create 4 active surfaces for Subarray 2, and 5 active surfaces for Subarray 3.

After you make those changes in the scene, the 3D shade calculator will calculate a set of shading losses for each string, and automatically assign them to each subarray on the Shading and Snow input page.

Best regards,
Paul.