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Ground Measured Data Vs Meteo-Data Sets

Comparing one year data of 57 on ground  Pyranometer's with four most popular meteo-data sets
We collected Actual Global Tilted Irradiation (AGTI) of 57 sites from operational projects spread across in India. It was then correlated with Expected Global Tilted Irradiation (EGTI) from the following meteo-databases namely:
Key Takeaways for Stakeholders

a) Annual Solar Radiation Correlation – Sites in %

b) Annual Solar Radiation Deviation – Sites in %