A solar module comprising: a shallow enclosure comprising a back plate and a corresponding front plate , said front plate being transparent to solar light and defining an inwardly oriented surface and an outwardly oriented surface , a plurality of solar cells being accommodated between said front plate and said back plate and adjacent said inwardly oriented surface of said front plate , said solar cells being exposed to solar light at said front plate , a nozzle being fixedly mounted on said outwardly oriented surface of said front plate or on a frame located at said outwardly oriented surface of said front plate , said nozzle being adapted to generate an air stream, across said outwardly oriented surface of said front plate and having an overall flow direction parallel to said front plate for removing dust from said outwardly oriented surface of said front plate , a pressurization system connected to said nozzle adapted to supply said nozzle with pressurized air, a control valve having a closed state preventing air from flowing from said pressurization system to said nozzle and an open state allowing air to flow from said pressurization system to said nozzle . characterized in that a light sensor located in a dust free location, said light sensor being adapted to generate a light intensity value corresponding to the intensity of the solar light at said outwardly oriented surface of said front plate , and a control circuit adapted to generate an energy value corresponding to the energy generated by said plurality of solar cells , said control circuit being adapted to calculate a ratio between said energy value and said light intensity value, said control circuit being adapted to cause said control valve to assume said open state when said ratio falls below a predetermined ratio, said light sensor is located-within a sealed enclosure , said sealed enclosure being adapted to periodically expose said light sensor to solar light. a shallow enclosure comprising a back plate and a corresponding front plate , said front plate being transparent to solar light and defining an inwardly oriented surface and an outwardly oriented surface , a plurality of solar cells being accommodated between said front plate and said back plate and adjacent said inwardly oriented surface of said front plate , said solar cells being exposed to solar light at said front plate , a nozzle being fixedly mounted on said outwardly oriented surface of said front plate or on a frame located at said outwardly oriented surface of said front plate , said nozzle being adapted to generate an air stream, across said outwardly oriented surface of said front plate and having an overall flow direction parallel to said front plate for removing dust from said outwardly oriented surface of said front plate , a pressurization system connected to said nozzle adapted to supply said nozzle with pressurized air, a control valve having a closed state preventing air from flowing from said pressurization system to said nozzle and an open state allowing air to flow from said pressurization system to said nozzle . characterized in that a light sensor located in a dust free location, said light sensor being adapted to generate a light intensity value corresponding to the intensity of the solar light at said outwardly oriented surface of said front plate , and a control circuit adapted to generate an energy value corresponding to the energy generated by said plurality of solar cells , said control circuit being adapted to calculate a ratio between said energy value and said light intensity value, said control circuit being adapted to cause said control valve to assume said open state when said ratio falls below a predetermined ratio, said light sensor is located-within a sealed enclosure , said sealed enclosure being adapted to periodically expose said light sensor to solar light. <EOS>