Analysis of the Optimal Performance Point Concerning Ambient Temperature and Irradiance for an Off-Grid System in Comparison to Standard Conditions in a PV Power System

Aim: Researchers are establishing the challenges associated with power plants of photovoltaic energy systems to enhance their adaptability, durability, and ecological sustainability, aiming to make significant advancements that address current deficiencies in solar energy technology. This study aims to evaluate the performance of an off-grid photovoltaic system (4175 kWP) under varying irradiation and ambient temperature conditions, to determine their effects on system efficiency and global losses. Methods: Using a simulation model (PVsyst/Matlab/experimental setup), we analyzed system performance under different environmental conditions. The study focused on ambient temperatures of 20°C, 30°C, and 35°C, with irradiation levels of 500, 600, 700, and 800 W/m², in comparison to the standard conditions established by the photovoltaic system, which are 1000 W/m² irradiation and an ambient temperature of 25°C. Results: The performance at 30°C was 3465.9 kW with a loss of 16.8%, and at 35°C, the Pmpp was 3388.3 kW with an 18.6% loss. Conclusion: These results underline the necessity of factoring site-specific climatic conditions when designing off-grid PV systems to ensure optimal efficiency and reduced energy losses. Recommendation: Future studies should incorporate additional external variables, such as wind velocity and incidence angle, to develop a more comprehensive model of PV system performance.