We propose suitable solutions, topology, dimensioning and selection of components for electrical systems in buildings where the use of photovoltaics, possibly even batteries, is envisaged. We perform simulations in the programs PVSOL, Matlab, CitySim, etc. We enable the integration of advanced management tools based on the forecast of production from photovoltaics and consumption of the object. We carry out ongoing energy measurements in buildings and consultations on possible energy-saving measures. We analyze the shielding of PV systems.