A method of evaluating performance degradation of a photovoltaic module

摘要

The method involves measuring energy output values that are compared year by year from a comparable power curve of a photovoltaic or solar module through a variable delivered by a photovoltaic generator so that energy differences are determined on the basis of classes. A power reduction of the module is indicated with respect to previous years from the energy output values directly delivered by the module by calculating the difference with respect to energy outputs of the years to be compared. The data of comparable days having the power curve are observed over multiple years. An independent claim is also included for a solar plant for implementing a method for determining a power reduction due to ageing of a photovoltaic or solar module at constant radiation intensity.