Since the penetration of photovoltaic (PV) systems in the electrical network is increasing, the need to register and model the contribution of these systems, in terms of disturbances and power availability, is becoming a crucial issue for optimal management of grid. On the other hand, electrical signature of sources and loads is the unique generation/consumption pattern intrinsic to each individual electrical appliance/piece of equipment. So, this paper, starting from the analysis of the disturbance impact of a 20 kW grid connected PV system, performs a preliminary study on building a method to better understand and explore the nature of electricity generation patterns of PV plants. Through this knowledge, it is possible to explore and develop innovative applications to achieve better utilization of resources and develop more intelligent ways of operation in new smart grids.