ABSTRACT This research analyzes the effect of azimuth angle variations on the performance of solar panels on the rooftop solar power generation system (PLTS) at the Faculty of Engineering Building, Riau University. The azimuthal angles tested were 160°, 170°, 180°, and 190° with a fixed tilt angle of 5°, using 4 x 100 Wp solar panels. Data were collected through direct measurements from 0…