In this study, the correlation between electrical efficiency and temperature for a hybrid photovoltaic-thermal (PV/T) system in which double solar panel and thermal collector were found to investigate performance of hybrid-system by independent of the network. One of the panel was cooled by water which pass through the single copper pipe while another one was without any cooling fluid in order to make a comparison between measured results. As a result of measurements, variables were observed at electrical power and its? efficiency which were obtained by cooled panel and other. Additionally, Mardin Meteorology Provincial Directorate data were compared with by measured results of obtained hybrid - system for more accuracy. As a result of cooled panel, an increase of 14.4% was defined at electrical output maximum power point which was calculated for electrical efficiency increased as from 7.5% to 8.6% for each values.