Which photovoltaic fixed bracket is the best

A solar cell performs the best (most energy per unit time) when its surface is perpendicular to the sun's rays, which change continuously over the course of the day and season (see: ). It is a common practice to tilt a fixed PV module (without ) at the same angle as the latitude of array's location to maximize the annual energy yield of module. For example, rooftop PV module at the tropics provides highest annual energy yield when inclination of panel surfac. [pdf]