With the need for greater diversification of the world energy matrix and the inevitability of investment in clean energy sources, photovoltaic solar energy has proved to be a promising energy source. Its growth today is exponential and is increasingly present in the energy matrix of most countries. In Brazil, there is already a solid photovoltaic market with the generation of thousands of jobs and investments of billions of reais. Its intermittency and unpredictability is the reason for great research, in order to obtain reliable data that estimate the generation of a photovoltaic solar system throughout its life cycle. Therefore, this work conducts an extensive bibliographic review, going through the basic foundations, until the development of a robust algorithm, integrating mathematical models present in the literature. Global solar radiation, wind speed and temperature data are obtained from maps generated by 39 solarimetric stations within and near the borders of the state of Rio de Janeiro. The simulation tool also has an extensive current database of solar modules and inverters. After a series of validations and sensitivity analyzes, it presented satisfactory results in terms of its forecasting capacity. In this way, it is possible to simulate and size solar photovoltaic systems, calculating indicators and detailed cash flow that reflect the viability of a given project. In addition, the simulation tool has the ability to generate georeferenced maps that contribute to a technical, economic and environmental assessment of a region to be analyzed. As a result, it becomes a fundamental tool for investors in the sector.