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This paper presents a review of better performance for the photovoltaic system using different technologies and parameters by considering many factors to get the best design and simulation that could fit the Iraqi atmosphere. These factors are the best energy production by using optimum tilt and azimuth angle, considered the most important parameters for getting the maximum solar radiation and eventually getting the preferable performance which depends on the mathematical model that fits each country. The economic profit for a PV system that the reviewer analysis in each paper for maximizing the solar contribution to a particular load, in addition to the impact of how weather conditions such as temperature, solar radiation intensity, etc. have an impact on solar cell efficiency and productivity.; all these factors besides the stability of the solar cell, the relation of the Self Consumption (SC) Degree of Autarky (DA) and economic-efficiency that effect on the PV system performance. The various orientation enables us to obtain many possibilities that serve the required study. [ABSTRACT FROM AUTHOR]