Summary
Longâterm energy production of photovoltaic (PV) systems is predicted and evaluated using a degradation rate analysis. It is one of the most important factors to consider before investing in PV power plants since it indicates the system's dependability and, hence, profitability. This paper examines the degradation rates of three different PV module technologies in a mountain/cold region, over a 5âyear period; including monocrystalline silicon (monoâSi), polycrystalline silicon (polyâSi), and amorphous silicon (aâSi). This study has been performed using different statistical techniques such as classical and seasonal decomposition (CSD), seasonal and trend decomposition using loess (STL), Holt winters (HW), and linear regression (LR). According to the obtained results, aâSi modules have the highest degradation rate with values varying between 1.12 and 1.17%/year, followed by monoâSi (0.69â0.98%/year) and polyâSi (0.11â0.75%/year) technology respectively. This research included an economic analysis to determine the Levelized Cost of Electricity (LCOE) of the three investigated systems. The findings show that crystalline technologies (polyâSi and monoâSi) are more costâeffective than aâSi, with an LCOE of 0.099âUSD/kWh, 0.108âUSD/kWh, and 0.138âUSD/KWh respectively.