Guilherme de Almeida Ponce

Hello, my name is Guilherme and I'm studying the One-Diode Method used on PVSyst. I'm interested in the Voc calculation because when i read the calculus description on PVSyst I couldnt find anythis about thais calculatoin in expecific. PVSyst quoted SANDIA MODEL, in their method they have a specific equation for Voc, I'm trying tio find it, the equation for Voc and it's variables. To be more especifc, how Voc varies with irradiation and temperature. Thank you everyone and have a nice day!