Solar Photovoltaic (PV), a variable renewable energy, has continuously penetrated and increased its share in the global energy mix. However, due to its variability, its large-scale integration into the electrical network poses some technical and economic issues. Centralized Battery Energy Storage Systems (BESS) have been seen as one of the techniques to integrate more decentralized and distributed variable renewable energy systems into the grid and will thus facilitate the greater democratization of the energy systems. However, BESS has to be correctly allocated to work in the electrical network. This paper provides a practical process for evaluating the proper allocation of a centralized BESS in three types of communities with rooftop Solar PV, namely low-cost, medium-cost, and high-end community, by considering the mean and maximum energy consumption and peak demand profiles of each residential unit. Such values are used to allocate for the Solar PV system per residential unit and the centralized BESS at mean, 75% of maximum, maximum, and 125% of maximum energy consumption, to be used for the community and excess energy to support the electrical networks reliability improvement. The result shows that allocating the centralized BESS using the maximum and 125% of maximum energy consumption can provide more than enough energy capacity for electrical networks reliability improvement by supplying for the energy not Supplied (ENS). The result provides that for a High-end community, the stored energy in the BESS can reach up to 24,578kWh using 125% of maximum sizing at either mean or maximum energy consumption. While for Medium-cost and Low-cost communities, the stored energy can reach up to 17,549kWh and 14,527kWh using 125% of maximum sizing at either mean or maximum energy consumption, respectively.