An important advancement in the building's integrated centralized generation inside the LVDC grid is the rooftop photovoltaic system, which is mounted on contemporary timber roofing. As opposed to traditional rooftop PV modules, which often call for fixed cable connections between the PV array, the power converters, and the loads on the building, the clear advantages of the suggested PV-IWPT system eliminate the need for a complex wall wiring design and streamline the installation process through eliminating the actual physical cable connections, which are primarily made possible by the IWPT technique between the building's interior and rooftop. A series IWPT converter powered by the PV panel––s and immediately loaded by the LVDC grid makes up this effective PV-IWPT system. Finally, we analyze theoretically and verify experimentally by simulation the proposed PV-IWPT system in a 500-W under different irradiance conditions