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Die Abweichungen bei GHI sind wesentlich kleiner als bei DNI. Korreliert man die Daten für GHI und Temperatur von satellitenbasierten Messungen und Bodenstationen, so erhält man gute Regressionswerte von R²=0,92 bzw. R²=0,97.
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However, the deviation is smaller when GHI is considered instead of DNI. If data for GHI and temperature from both satellite-based data and ground-measured data is correlated, good regression values can be reached: R²=0.92 and R²=0.97. If DNI and wind speed is considered, regression values show huge deviation between both measurements: R²=0.78 and R²=0.5.
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Additionally, the quality of the installed measurement instruments has to be carefully considered to get accurate measurement results, e.g., classification of pyranometers. Benefit from our long-term experience and our know-how from many projects worldwide to get the best measurement system for your solar project.
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