Bulent

Dear Martin Many Thanks for your reply. Best Regards Bülent

Hi we are designing rooftop projects in Turkey . When we prepare the PVSOL reports, we often encounter much lower specific yields than compared with simulations on same location with PVsyst, which puts us in a less preferred situation for our customers. Comparing global irradiation data from SOlargis, your values for Turkey is always at least 10-15% lower. Also when we compare the real production in same location with the output from PVSOL, we see that the real yields are at least %10 higher than PVSOL estimations. Is this normal ? How could we change the global irradiation data which meteocontrol database provides with 10% up ? or any other suggestions ? Best Regards Bülent Aydın