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We are also facing the same problem. We are using hourly irradiance-weighted module temperature values from weather file and hourly irradiance weighted module temperature values measured at site for temperature correction in Performance ratio for the site. However, some clients suggest that there is no need for using irradiance weighted Tarray values from PVsyst as these are already calculated using irradiance. Please suggest if it is uncorrect to use Irradiance weighted module tempearture instead of direct Tarray values.