Amid growing needs for sustainable buildings and renewable energies, this paper presents a comparison between two different approaches of solar irradiation models for the production of electrical energy from photovoltaic (PV) panels. This project aims to evaluate the electrical energy produced from the sustainable building ADREAM, located in LAAS-CNRS, Toulouse. Initially, the Energy Simulation Software Pleiades+Comfie (P+C) was employed for the global Dynamic Thermal Modeling of the building. Thus, the P+C software served as a reliable tool for the modeling of the electrical production from the installed PV panels. In order to estimate the performance of this model, its accuracy was compared to that of an optimized solar irradiation model (Matlab), built from literature references. A description of the ADREAM building is provided, along with the methodology of the two simulations. The simulated results of PV energy production were compared to measured data. Finally, the two results were evaluated for the purpose of determining the most optimized modeling strategy. Figure 1 : Energy sources and systems installed at the building ADREAM 2