We can define system performance as the ratio of energy passing through the system such as the panel-inverter-boards-transformer-cables to panel production. Production decreases according to the amount of solar radiation falling on the panel.In order to measure the system performance, the amount of radiation coming into the system must be measured first.The location, maintenance and calibrations of the sensors placed in the fields are vital for measuring the amount of irradiation. Accurate measurement of system performance makes it possible to assess the health of the systems.

System performance analysis is done according to the simulations made with professional solar software before the system is installed. Evaluation is made by comparing the performance rates determined by simulations and production values with the actual values. After the performance analysis, the system performance is improved and the performance of the system is maximized.