Photovoltaic technologies convert solar radiation into electrical energy, allowing plant applications ranging from a few kW of power in residential installations to several MW of photovoltaic power plants. Due to the high degree of professionalization achieved, and also thanks to the boost from available incentives in various countries, photovoltaics has had continuous development in recent years. The renewable energy sector and, in particular, the production of electricity from solar photovoltaic have received great attention in Italy in the last two years, thanks to the generous incentives that , in addition to encouraging numerous investors, they have influenced the market, allowing module and inverter producers to obtain a favorable price. 

The metal carpentry work, generally made from extruded anodized aluminum profiles, which characterizes the support structure of the modules, varies greatly in relation to the type of installation, which we reproduced through door stops. In the photovoltaic integration on a ventilated facade or in the use of semi-transparent modules it is necessary to have particular fixing systems and substructures with often high costs. Therefore when choosing how to produce energy and everything concerning the costs for the construction it is necessary to take into account the usefulness weighted marginal which is given by the ratio between marginal productivity and price. In order to understand whether an investment of this kind will be effective or not.