For thin-film modules, is the calculation based on the initial values or the stabilized values?

In Sunny Design, the stabilized values are used as the basis for calculation,

with the exception of open circuit voltage. This exception is due to the layout rules limiting the working environment of the solar generator by the lowest and highest voltage.

The lowest voltage is taken from the MPP voltage at high cell temperature. Because the voltage gets lower as the stabilization process progresses, the stabilized value is used.

The upper limit for the working environment is formed by the open circuit voltage at low cell temperature. In the default settings, this value is the highest and is therefore used for the layout.