Photovoltaic systems have become widely recognized as a realistic and viable source of power. The PV panel output voltage is strongly dependent on solar parameters, which is one of the most critical issues with PV systems. As a result, PV panel output cannot be directly linked to loads. To act as an interface between PV panels and loads, a SEPIC Converter is necessary. The DC-DC boost converter keeps the PV system’s output voltage constant. It transforms variable PV panel input voltage to output voltage maintained constant via output capacitors to the loads. The duty ratio affects the output voltage of a typical SEPIC converter. The output voltage will fluctuate if the input voltage changes while the duty ratio remains fixed. The duty ratio is regulated depending on the input voltage to achieve a constant output voltage. The input voltage is used to alter the duty ratio. In PV systems, PID controllers are widely utilized as SEPIC converter controllers. The PID controller parameter is tuned to enhance the controller’s operating range. SEPIC converters K_p, K_d, and K_i under various input voltage conditions. The regulated SEPIC converter serves as a link between the solar panels and the SEPIC converter’s load. A unique PID controller was used for a SEPIC converter for control to get the voltage controller in a PV system. When compared to a closed-loop SEPIC converter, the optimized PID SEPIC converter for PV systems provides the optimum performance. The simulation findings confirm that the SEPIC converter controller in a PV system is effective and trustworthy.