According to many future scenarios, a high penetration of renewable electricity in the electricity mix will be needed in order to limit global warming. To accomplish this, in most countries the share of renewable electricity will need to drastically increase from its present values. Energy communities may be one of the enablers of this growth, due to their potential to support the development of distributed infrastructures and to increase grid flexibility. This work analyses the impacts that yearly energy demand, synchronism between photovoltaic (PV) energy generation and energy demand, PV inclination and orientation, and the presence of energy storage systems have on a residential energy community’s key performance indicators (KPIs).