Photovoltaic energy source model is designed in this work and its performance is evaluated. For this study of daily measurements of the global solar radiation over a period has been attempted .The equation for the estimation of global solar radiation is designed and validated. The validation of this model is compared with experimental results obtained at local solar station. This simulation comparison is based on sampled local climatic data of sunny and sunless day. On a day, Panel generates power from dusk to dawn and its various level of radiation during every hour is noted at the normal temperature and battery available capacity is also noted. Obtained results show that both models simulation are quite satisfactory. These results should help system engineers to choose the right control strategies and the battery industry to choose and develop appropriate batteries for PV applications.