The lab-access user project “Investigating the Effect of Third Generation Photovoltaics (Large Scale Perovskite Solar Cells) Penetration in Electric Grid (IETGPSC)” was conducted at the host lab of National Technical University of Athens (NTUA) in the time period 11/07/2022 to 26/07/2022. The IETGPSC project investigated the effect of third generation solar cells namely perovskite solar cells to the electric grid at normal case of operation, fault case and islanding case of operation and examine the performance of the grid stability. The results also compared with silicon based solar cells under the same conditions of operations. Where the power hard ware in loop (PHL) methodology has been used to integrate the solar cells and the inverter to the electric grid and the real time digital simulator (RTDS) also has been used to obtain the on time signals of the system.