Abstract: The objective of this study presents how to increase the electrical efficiency and power output of Photovoltaic (PV) panel by using Phase Change Material (PCM ) to cool the back surface of PV as a passive way. These are dependent on its back temperature when the back cell temperature increases its electrical efficiency decreases. The current research is based on experimental study the effect of using paraffin wax as a PCM on thermal behavior and electrical performance of a PV panel by compared the performance of PV/PCM to that of conventional PV. A simulation of both PV panels in MATLAB Software was performed to calculate the I-V and P-V characteristic to evaluate the MPP. The final results showed that for 4 h of testing the efficiency of PV/PCM panel range from 19.66-12.72% and from 18.84-12.24% for conventional PV. Also, the maximum enhancement Electrical Efficiency Percentage (EEP) is 6.89%.