Analysis of the Relationship Between Photovoltaic Temperature Coefficients and Varying Solar Irradiance Levels
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Abstract
This work presents an experimental investigation into the temperature coefficients of aged monocrystalline photovoltaic (PV) modules operating under real outdoor conditions. The analysis is based on one year of high-resolution monitoring data from a grid-connected PV system composed of three subsystems, each consisting of 30 modules. The key electrical parameters-maximum power output (Pmax), voltage at maximum power point (Vmpp), and current at maximum power point (Impp)-were continuously recorded alongside environmental variables such as solar irradiance and wind speed. Data filtering was performed in accordance with IEC 61215 standards to ensure the reliability of results. Temperature coefficients were determined by applying linear regression to the electrical parameters as functions of module temperature, under various irradiance levels ranging from 100 W/m2 to 1200 W/m2. The results reveal that while TC_Vmpp remains relatively stable, TC_Impp displays increased variability at higher irradiance levels. Meanwhile, TC_Pmax exhibits a consistent linear decrease with increasing irradiance, supported by high correlation coefficients (R2 > 97%). These findings underscore the importance of site-specific and irradiance-aware evaluation of temperature coefficients, particularly for aged PV modules. They provide valuable insights into the determination of TC_Pmax based on a single irradiance level, allowing its estimation under other irradiance conditions-especially under standard test conditions (STC).
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Allouhi, A., Rehman, S., Buker, M. S., & Said, Z. (2023). Recent technical approaches for improving energy efficiency and sustainability of PV and PV-T systems: A comprehensive review. Sustainable Energy Technologies and Assessments, 56, 103026.
Bamisile, O., Acen, C., Cai, D., Huang, Q., & Staffell, I. (2025). The environmental factors affecting solar photovoltaic output. Renewable and Sustainable Energy Reviews, 208, 115073.
Belhaouas, N., Ait Cheikh, M. S., Malek, A., & Larbes, C. (2013). Matlab-Simulink of photovoltaic system based on a two-diode model simulator with shaded solar cells. Journal of Renewable Energies, 16(1), 65-73.
Belhaouas, N., Hafdaoui, H., Hadjrioua, F., Assem, H., Madjoudj, N., Chahtou, A., & Mehareb, F. (2024). Failures and performance of different aged PV modules operated under northern Algerian climate conditions: Analysis, assessment, and recommended solutions. Engineering Failure Analysis, 163, 108504.
Belhaouas, N., Mehareb, F., Kouadri-Boudjelthia, E., Assem, H., Bensalem, S., Hadjrioua, F. ... & Saheb-Koussa, D. (2022). The performance of solar PV modules with two glass types after 11 years of outdoor exposure under the mediterranean climatic conditions. Sustainable Energy Technologies and Assessments, 49, 101771.
Bhavani, M., Reddy, K. V., Mahesh, K., & Saravanan, S. (2023). Impact of variation of solar irradiance and temperature on the inverter output for grid connected photovoltaic (PV) system at different climate conditions. Materials Today: Proceedings, 80, 2101-2108.
Irshad, A. S., Ludin, G. A., Masrur, H., Ahmadi, M., Yona, A., Mikhaylov, A. ... & Senjyu, T. (2023). Optimization of grid-photovoltaic and battery hybrid system with most technically efficient PV technology after the performance analysis. Renewable Energy, 207, 714-730.
Mahmood, F., Majeed, H., Agha, H., Ali, S., Tatapudi, S., Curtis, T., & TamizhMani, G. (2017, August). Temperature coefficient of power (Pmax) of field aged PV modules: impact on performance ratio and degradation rate determinations. In Reliability of Photovoltaic Cells, Modules, Components, and Systems X (Vol. 10370, pp. 52-58). SPIE.
Mamun, M. A. A., Islam, M. M., Hasanuzzaman, M., & Selvaraj, J. (2022). Effect of tilt angle on the performance and electrical parameters of a PV module: Comparative indoor and outdoor experimental investigation. Energy and Built Environment, 3(3), 278-290.