Mohamed B. Saleh*, Mahmoud M. Shabana** and Mohamed R. Rizk**
* Electronics & Computer Studies Dept., College of Eng. Studies & Tech., Arab Maritime
Transport Academy, Alex., Egypt
** Faculty of Engineering, Alex. Univ., Alex., Egypt
In this work we investigate the performance of locally made PV modules under Alexandria weather condition. I-V characteristics of the module have been plotted at the same illumination level and equal intervals of time during six years. The experimental data obtained from the electrical characteristics were used to calculate the module parameters, namely, the photogenerated current, the saturation current, the ideality factor, and series and shunt resistances. It is found that the module degradation decreases with time and then it stabilizes.
Photovoltaic module; environmental study; module characteristics; module parameters.
Photovoltaic systems are intended for wide-spread use in a variety of geographical cilmates as well as in areas of heavly pollution. Various environmental conditions have a determinental effect on the long term performance, capability and reliability of solar cell modules. The most significant effects against which terresterial arrays must be protected include high wind loadings, corrosion aided by moisture, high temperature, and air-born contaminants.
This paper presents the results of am environmental study carried out on locally made modules for the period from 1984 to 1990. The modules were locally made by potting technique using commercially available solar cells.
The performance of the modules has been recorded at equal intervals of time during the six years of study. The main solar module parameters, namely, series Rg and shunt Rsh resistances, ideality factor n, saturation current Is and the photogenerated current Iph, were calculated from the measured I-V characteristics. The cell contacts, the glass surface and the sealing of the encapsulation material were inspected.