Efficiency of solar cells is dicertly linked to the temperature of the cell. With the goal of optimasing PV technologies, new solutions for maintaining and lowering the cel temperature are being found.With the creation of precise and robust analytic models searching and finding new inovative ways of problem solving is made easy. In order to create high quality analytic model, founding experiments have to be done on whos values analytic model will be based on. Knowing heat fluxes of flat boards requires knowing panel temperatures on both sides, air temperatures, speed and wind direction, sun's irradince and local bodies irridance and panel orientation. Measuring of heat exchange coefficient in the experimental part of the thesis has been done in two fases. First fase has been done in a lab where different wind speeds, angles and positions have been simulated through a wind tunnel. Heat flux was stimulated over a set of heaters, so inicial heat impulse was created. In order to confirm the values and correct work methodology, a second part of the experiment has been added represention effectes of outside conditions on a PV panel. Second part of the experiment has taken place on the Faculty building rooftop. With earlier measured values, importat panel positions for their uncharacteristics behaviour have been spotted. In the second part of the experiment the focus has been turned towards these positions. Certian amout of deviation of expected values has been measured due to complexity and unstable steady state condition in real-life. For a higher quality comparison and precision more accurate measuring equipment is advised. As well as a longer period of dana collecting