Effects of Temperature on Photovoltaic Array Conversion Efficiency and Fill Factor

Full Text PDF PDF
Author(s) Guda, H. A. | Aliyu U. O.
Pages 49-55
Volume 5
Issue 1
Date January, 2015
Keywords Photovoltaic Array, Fill Factor, Conversion Efficiency, Temperature Effect, Stand-Alone

Abstract

This paper presents the results of an in-depth study on the effects of temperature on photovoltaic array conversion efficiency and fill factor. Although there are well documented efforts on the effects of temperature on photovoltaic cell and module efficiencies, such efforts have not been extended to a complete array size. Although photovoltaic cell or module efficiency values may be analytically scaled to obtain corresponding array size values, this approach is not accurate due to obvious mismatch considerations. Furthermore, there are limited studies on the effect of temperature on the fill factor of photovoltaic arrays. In this paper, effort has been made to document clear effects of temperature on both conversion efficiency and fill factor of a photovoltaic array installed in the Faculty of Engineering and Engineering Technology of Abubakar Tafawa Balewa University, Bauchi, Nigeria. Measurements were carried out to obtain exact dependence of conversion efficiency and fill factor on temperature for the PV array. The measurements covered the 3 major microclimatic weather conditions of harmattan, cloudy and clear sunny seasons. Regression analysis is then performed on the data to obtain empirical relationships between fill factor and temperature and between temperature and conversion efficiency for all the seasons. The results show that the PV array has its highest energy conversion efficiency of 13.14% during harmattan, while having a least efficiency of 12.43% during the clear sunny season. Similarly, the PV array exhibits its highest fill factor of 0.756 during harmattan while having its least fill factor of 0.708 during the clear sunny season. Furthermore, the conversion efficiency of the array drops by 7356x10-5% 7262x10-5% and 7427x10-5% during harmattan, cloudy and clear sunny seasons respectively for every 1oC rise in temperature while its fill factor drops by 116x10-5, 109x10-5 and 116x10-5 during harmattan, cloudy and clear sunny seasons respectively for every 1oC rise in temperature.

< Back to January Issue