ABSTRACT This study aims to determine the optimum tilt angle and orientation of photovoltaic panels to increase the efficiency of solar power generation (PLTS) in Pekanbaru, which has abundant solar energy potential. Experiments were conducted using four monocrystalline PV panels with a capacity of 20 WP with tilt angles of 10°, 15°, 20°, and 25° and orientations of north, east, south,…