Solar concentrator

A solar concentrator module comprising a front lens on its front face and a receiver cell on its rear face, a reflector between the front lens and the receiver cell, said reflector having inclined sidewalls along at least two opposite sides of the receiver cell, and a flat perpendicular reflector at the center of the module, characterised in that the reflectors are truncated to the extent that the ratio between the concentrator module height H and the focal length F of the lens is between 0.6 and 0.9 and in that said inclined sidewalls are inclined in such a way that, for a 0° off-pointing, solar rays are reflected on the inclined sidewalls of the reflector before impinging on the receiver cell, so that a relatively uniform illumination on the receiver cell occurs for a range of off pointing acceptance angle superior to zero degree.