The invention provides a system and method for analyzing the performance of an irradiance sensor of a photovoltaic system. More specifically, a remote calibration system may receive irradiance data from an irradiance sensor of a PV system. The remote calibration system may then filter the irradiance data using one or more of a threshold filter, a curve fit filter, and a correlation filter. The filtered irradiance data is then compared to an estimated irradiance to generate an irradiance weighted average which may be used to adjust subsequent irradiance data provided by the irradiance sensor. A report system can be adjusted with the irradiance weighted average to prevent generation of a report for the irradiance sensor.