This thesis project presents the design, simulation and comparison of two different configurations of a photovoltaic system installed on an office building in Santiago, Chile. One is a BAPV type consisting of mono-crystalline modules used as Sun shields on the north facade windows and also mounted on the roof facing the same direction, an installed power of 488.4 [kWp] is calculated. The second is a BIPV system with mono-crystalline semi-transparent modules on the windows and opaque panels on the walls and the same roof installation as the other case, results in 885.87 [kWp] installed. The same model of three-phase inverter is used, but 9 are required in the first case and 15 in the latter.