According to the PVsyst model, the highest value of the voltage of an open circuit of a PV module is -10 C. When I select a temperature, for example, -20 C, this is the voltage of a lover than at -10C. In accordance with the technological tools of manufacturers of inverters (SMA or ABB), this voltage continues to increase at a lower temperature.
I design PV systems in Ukraine, where winter temperatures can drop to -20 C.
I'm confused. What data do I need to use when determining the number of modules in a row?