I am working with the spectral irradiance on different planes. The readings are available on a global horizontal and plane of the array of 45 degrees. I have a PV module inclined vertically and I want to apply the transpositional model to calculate the spectral irradiance at a vertical plane. I am looking for a reliable model, which I haven't come across, unfortunately.
I believe, spectral albedo would be the deciding factor on these models, even more so compared to the broadband albedo. Can someone suggest any spectral irradiance transpositional models? That'd be a great help.
You can use SMARTS to obtain the spectrum on any tilted surface, but it is limited to cloudless conditions. It includes a spectral albedo library.
Article The SMARTS spectral irradiance model after 25 years: New dev...
https://solarconsultingservices.com/smarts.php
Mohamed Azab The article that you referred is mostly based on broadband irradiance. I wanted some idea on spectral irradiance :)
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