Abstract: Techniques for collecting a large amount of sunlight without overheating the underlying solar cells are disclosed. According to one aspect of the techniques, a housing includes arrays of solar cells, elongated concentrating lenses, and arrays of reflectors. The solar cells are electronically connected to provide an electrical power with a certain magnitude, when exposed to sunlight. Each of the arrays of elongated concentrating lenses is positioned above and focuses the sunlight onto an array of solar cells. Each of the elongated concentrating lenses has an inner surface facing the array of solar cells, wherein the inner surface includes a plurality of elongated toothed edges to reduce heat from the sunlight being focused to the array of cells.

Abstract: Techniques for collecting a large amount of sunlight without overheating the underlying solar cells are disclosed. According to one aspect of the techniques, an array of concentrating lenses are provided, each of the lenses having a spherical surface that includes a plurality of concentric V-shaped rings. Such lenses have been proved to be able to focus a large amount of sunlight onto solar cells while at the same time reducing heat caused by the concentrated sunlight. To further heat dissipation, the solar cells are bonded to a metallic board. Various layouts of electrodes are designed to lead out the energy signals in the presence of the metallic board.