Abstract: An apparatus and method is disclosed which employs a light concentrator with an asymmetric acceptance angle to concentrate sunlight on predominately non-equatorial facing surfaces such as roof tops. In some embodiments a photovoltaic module is disclosed using triangular prisms to concentrate light onto silicon cells, thereby reducing the amount of photovoltaic material required for generation of electrical power from sunlight without reducing the amount of light accepted by the module on non-equatorial surfaces in the northern and southern hemispheres. In some other embodiments parallel aperture concentrators are used in place of triangular prisms.