System is suitable for family houses whose consumption assumes a high level of self-sufficiency and low load in local conditions within the immediate load - i.e. appliances in back up part (Backup) do not have load more than 3 kW for phase. The benefit is low noise level of the device, solution is suitable even for more complicated roofing systems or the possibility of selection of priority flow of clear energy up to four operational modes, including home security from sudden distribution network fall-outs.