Researchers in Portugal have used the so-called Arrhenius aging model to measure the temperature behavior and the reliability of different solar modules. Their analysis showed that the performance of the long -term module can vary considerably, depending on the production processes.
A group of scientists led by Portuguese Research Center Instituto de Telecomunicações and the University of Lisbon used the so-called Arrhenius comparison to assess the reliability of monocrystalline PV cells and modules.
The Arrhenius Aging Model is An empirical comparison that describes The effect of temperature on the speed of a chemical reaction. It is the basis of all predictive expressions that are used to calculate the Reactionate Constants.
The Arrhenius model describes the collision between load carriers – electrons and holes – for different temperatures, ”the corresponding author of the research, Ricardo A. Maars Lameirinhastold PV magazinese. “Electronic devices are aging due to conveyors’ collisions, then this model is suitable to characterize the aging processes of each electronic and opto -electronic device as solar cells. This is done by accelerated aging processes and the consideration of temperature cycles in ovens at high temperatures.”
The scientists tested several small monocrystalline solar panels that, by Chinese providers seed studio and OSEPP in different time intervals for 135 hours at constant temperatures from 65 ° C to 95 ° C, tested, with the accelerated aging temperature performed by only the temperature.
“This combination of time and temperature has led us to have operating times around thousands of hours, for example 135 hours at 95 ° C is equal to more than a thousand hours in the nominal operation at 48 ° C,” explained Lameirinhas: “For example, we have verified that the power outright is expected by the Arrhenius.”.
In the study “Experimental determination of relegation coefficients of Arhenius for monocrystalline photovoltaic solar cells“Published in Results in OpticaLamerinhas and his research group explained that they have measured electricity and voltage via GW entry GDM-8135 Multimeters, both in the DC voltage mode.
“The IV points are obtained one by one, reducing noise and the same load conditions for each resistance are guaranteed for different tests,” the academics emphasized. “To guarantee the repeatability of the tests and the validation of the model made from the test results, all tests are performed using three identical PV sun cells, with a light of 50 W with a light temperature of 6400 K, under 84 W/M2. “
The measurements showed that all tested cells and panels members at “high” demolition for open circuit voltage and maximum power and “moderate” demolition for short -circuit current. The studio modules seen appeared to lose 10% of their maximum power in 12 years and 5 months, while the OSEPP panels lost the same percentage in 45 years and 1 month. The big difference in reliability was attributed by scientists to various production processes and the associated module quality.
“This fact leads to the conclusion that the reliability of some solar cells that are available on the market cannot be insured,” the scientists concluded. “Within the 25-year commercial guarantees, the results also suggest that both power and voltage characteristics will expire between 10% to 15%.”
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