Abstract: A solar concentrator for concentrating solar radiation toward a solar cell, a concentrated photovoltaic module including a solar concentrator and a solar cell, and a secondary optical element for use in a solar concentrator are provided. The solar concentrator includes a primary optical element for collecting and focusing the solar radiation, and a secondary optical element. The secondary optical element is arranged to receive the solar radiation collected and focused by the primary optical element and includes an input end, and output end, and an adiabatic light guide tapering from the input end toward the output end and configured for concentrating and adiabatically guiding the solar radiation between the input and output ends. Some embodiments of the present invention can be useful in solar photovoltaic applications where it is desirable to provide high acceptance angles while maintaining high concentration and optical efficiency levels.

Abstract: A U-shaped spacer element supporting and retaining a photovoltaic panel assembly spacedly over a rooftop corrugated sheet; one shorter side leg thereof having an oblong bore, the other side leg having an intermediate ridge section. A screw engages into the ridge web and axially clears the shorter leg, anchoring the main body to the supporting rooftop frame elements through the corrugated sheet. The ridge section conformingly abuts against a longitudinal rib of the corrugated sheet. An L-shape bracket inner leg abuts against the main body short leg, the bracket outer leg abutting sideways against a registering portion of the photovoltaic panel assembly. A second oblong bore is made into the outer leg and extends parallel to the plane of the main body base leg. Two bolts engage the oblong bores and adjustably interlock the L-shape bracket to the spacer element main body and to the photovoltaic assembly.