In the past and until now, Belgium mainly had a mechanism in place that rewarded the PV energy production through feed-in tariffs that were attributed with a net annual balance counting. In Belgium, the mechanism of selfconsumption for photovoltaic (PV) installations is projected to become mainstream. This change is going to have an important impact on the PV sector in Belgium. At the moment, there is a demand for a simple simulation tool that makes it possible to simulate the self-consumption ratio and the self-sufficiency ratio of a PV system or a group of PV systems in combination with one local consumption profile or a group of consumption profiles from the same neighborhood, in particular in the context of collective self-consumption. Indeed, combining different consumption profiles from the same neighborhood can significantly improve the self-consumption ratio to reduce the cost of a PV system for the users. A free web application has been provided to the public for such simulation.