This work describes the analysis carried out for the sizing and simulation of grid-tie photovoltaic system in Pharos University. The design calculations and sizing results are performed with the aid of PV syst and other sizing software tool. The simulation is primarily performed in order to understand the behavior of grid tied photovoltaic installations at a specific location, while avoiding the over sizing or under sizing of the systems, Theoretical calculations are performed conventionally in order to make comparisons of calculated data with simulation results. We highlight the good potential of the studied area, with total energy yield 1654 kWh per year at optimal orientation, which would generate 1175 kWh/year for a 1 kW PV system, such information on potential and performance is a valuable reference for any possible sizing of photovoltaic projects at similar latitudes.