الفهرس 
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Abstract
The principle aim of the present study is to study and test some parameters affecting performance of photovoltaic units under clear sky conditions by using two types of photovoltaic namely: Silicon Film. Single Crystalline. The specific objectives was first: Study the effect of environmental conditions on the performance of the photovoltaic such as solar irradiance, ambient temperature and humidity and study the performance the photovoltaic under the weather conditions surrounded which include: 1 investigate and to compare between two types of the photovoltaic namely Silicon Film and Single Crystalline by study the effect of environmental conditions on its of each output power. 2 estimate the effect of tilt angle of photovoltaic panel an its the output according to the incoming solar radiations flux incident. 3 To study the comparison between two systems of the photovoltaic connection (series and parallel connection). Four PV panels were used in each system. 4 To explore the influence of the ambient temperature on cell temperature and also, on its PV out put. where, four levels of cell temperature were used. 5 To determine the total power out put which produced from the one panel of the photovoltaic to charge lead <U+2013>acid battery and calculate the total time and the total power which needs to reach the battery to its full capacity.