In the present scenario, the utilization of the power resources are diminishing down generations and the need for alternating resources like renewable sources are being checked for. Solar Energy is one such renewable source that can contain the power demand of generations. But, the constraints involved makes it complicated for usage and on the backdrop of these constraints several models have been proposed. Constraints such as low solar radiation and night time need storage to meet the energy demand. But, failures in the PV system due to storage batteries lead to increment in capital cost including high installation and replacement cost. So, the output of a PV generator is matched with a variable load using switch mode DC to DC converter. The input fed to a buck converter is stepped down to our required value. The output voltage is maintained constant under normal stable condition. If any disturbance is subjected to the proposed model, altering the output voltage is corrected using PI controller. Hence, this model with low power usage and auto controller solves us many challenges obeying the constraints.