Lebanon has a significant potential for the installation of photovoltaic systems. This technology of renewable energy is ecological, supplants other sources of energy and is widely attainable. The objective of this paper is to examine and evaluate the performance of an installed PV generator during three years 2013–2015. This case study of the integration of 56 kWp at the Industrial Research Institute (IRI) includes accurate data for solar radiation, energy production, benefits in fuel savings and reduction in CO2 emissions. The results can be used at any place with similar climatic conditions where these types of data are either missing or unavailable. All the data collected from this study will grant us an opportunity for installing and integrating a photovoltaic system into any industrial and residential building in Lebanon. It comes in accordance to the vision of the general directorate of the institute to help the industrial institutions in all aspects of apprehension, studies and researches.