Installation and maintenance of photovoltaic installations; Installation and maintenance of solar thermal installations; Installation of photovoltaic cells and modules; Installation of solar energy systems and alternative energy products for residential and commercial use; Installation, maintenance and repair of photovoltaic cells and modules; Installation, maintenance and repair of photovoltaic modules; Installation, maintenance and repair of solar energy systems; Installation, maintenance and repair of solar installations for generating power; Installation, maintenance and repair of solar installations for generating power, solar collectors and photovoltaic modules; Removal and reinstallation of solar panels