Dear All, I’m having an issue with comparing tilted (45 deg) total solar radiation with measurements. I have connected measured total horizontal radiation to Type16a, and taken as an output Total horizontal radiation. I have a significant difference in January (50%) , February (30%) and December (40%). Remaining months are ok. I have verified the Solar shift time, Latitude and checked whether any radiation occur during night – everything is fine. Can anyone suggest any solution ? kind regards Michal Klimas Poznan University of Technology |