Experimental investigation of the optimum photovoltaic panels’ tilt angle during the summer period

The photovoltaic (PV) technology has made considerable progress during the recent years in both grid connected and stand-alone applications, especially in areas of high local solar potential. In this context, the interest recently demonstrated in the Greek region concerning PVs encourages the investigation of optimum operation conditions for such systems. At the same time, summer-only applications, being rather common in Greece, require maximum exploitation of the local solar potential during the specific period of the year. For this purpose, an experimental study is currently carried out in the area of Athens, in order to evaluate the performance of different PV panel tilt angles during the summer period. According to the experimental results obtained, the angle of 15° (±2.5°) is designated as optimum for almost the entire summer period, while conclusions drawn are accordingly theoretically validated by means of established solar geometry equations.

► The Greek PV market has during the last years made considerable progress. ► Seasonal needs of electricity only during summer are common in several applications. ► Selection of the optimum summer PV panels’ tilt angle is of major importance. ► Experimental measurements are carried out during the entire summer period. ► Experimental results are accordingly theoretically validated.