In the dialog Bankability: Exceedance probability of the forecast yield you can set the P value with which the profitability calculation is to be carried out. The exceedance probability for the forecast yield is an important parameter for the bancability (financing protection) of large PV systems. However, the information given relates only to the concept of full feed-in. Unless otherwise specified, the P50 value is assumed by default in the revenue simulation. For the economic efficiency calculation there is a choice between:
The Overrun probability indicates with which probability the simulated yield is reached or exceeded in practice. For example, an exceedance probability of 75% (P75) indicates that a certain simulated yield is exceeded in practice with a probability of 75%. The higher the probability, the lower the expected yield.
Normally the values for P10 and P90 are determined directly from the climate data and used in PV*SOL®. This enables a realistic estimation of the probability of exceedance. If the P10 and P90 values could not be determined from the climate data, for example because you imported your own climate data, you can also enter the parameters for determining the variability yourself:
Both parameters are added quadratically to the total variability.