In this article, a new integrated high gain modified SEPIC DC-DC converter utilizing two input sources from PV module and grid source for on-board charging of electric vehicles is introduced. The proposed configuration operates in non-isolated modes in order to achieve high power conversion ratio, high output gain and better efficiency with two different control strategies. The grid source charges the LV and HV side of a battery commonly refers as GRID mode or by PV system refers as PV mode or by PV and grid source refers as PV and GRID mode. The drive system provides sufficient energy to charge the battery in RB mode. The design parameters, stress analysis and control algorithm have also been incorporated. The simulation results are validated using MATLAB 2021a software to regulate the converter performance under various modes. A 150 W hardware prototype was developed to validate results and performance of the converter under all modes.