Selm – Sistemas e Microelectrónica Unip. Lda is a Portuguese small company, founded in 2004 which started its activity in a trend of development of electronic systems, including equipment for alternative energy. With the opening of the Photovoltaic market in Portugal, this has become their major business area, primarily in the design and installation of photovoltaic units connected to the grid. Meanwhile pioneered the interconnection to the grid small power of micro hydro, these manufacturing itself. Its growth has been sustained with a strong technical knowledge of the proposed systems and a constant search for solutions to the problems presented