In this work, we studied how we can model and simulate the photovoltaic (PV) generator to be installed on the roofs of the Faculty of Applied Sciences, University of Ouargla in Algeria and in free space on the ground surface to achieve positive energy buildings, This is based on a program ECOTECT to compare results and specify on both projects the shadow effect and cost factor (economic aspect), as we all used solar radiation hour data on a horizontal level in the city of Ouargla for a day that expresses a month each year these data were used to calculate the energy produced by photovoltaic cells per month and comparing the consumption map we get in the last surplus of production, particularly in a few months, which exceeded demand three to four times in both projects is what led us to propose the hydrogen storage system as a solution and think of several scenarios for the right future prospects, This is based on a Geographic Information Systems (GIS) program.