This work proposes a comparative analysis of a photovoltaic system interconnected to the public distribution network, using the PVsyst® software, a program used by engineers for sizing photovoltaic systems. The aim is to analyze the energy generation estimated by the software with the actual project data, that is, the energy that was actually generated. A comparison is made that highlights the main parameters of the project, such as efficiency, generation and losses. This work is divided into two stages, the first stage is the collection of data related to the project site, for example, geographic data, irradiance, energy production and information on the equipment used. For the second stage, the simulation is carried out using the PVsyst® program according to the input data. In this program, the main modules used to allocate information were: guidance and system variants. After carrying out the verification, it was concluded that the two methods, both the real dimensioning and the simulation converge to the same solution. The building in which the study was carried out has an annual energy
generation of approximately 28,850 kWh, all the energy generated is not intended for the site, but to feed four Consumer Units (CUs) remotely. Therefore, these analyzes allow us to infer that it is possible to obtain a considerable return (pay back) as a financial and ecological return, in addition to collaborating with the preservation of natural resources.
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