Analysis of Energy Saving Effect of Residential BESS Connected to Roof-top PV in a Multi-family House

The discussion about carbon neutrality has recently spread worldwide in response to the climate crisis. In Korea, concept of zero-energy buildings is one means reduce emissions construction sector. Photovoltaic (PV) power systems are most commonly installed renewable energy residential buildings. However, PV capacity apartment houses limited because difficulty securing installation area and inability process surplus power. Battery storage (BESSs) emerging as a for reuse this study, energy-saving effect BESS connected rooftop system was analyzed eight households multi-family house. data main load (grid supply) PV+BESS from collected August October 2021 were analyzed. During operation BESS, stored battery, continuously supplied by discharging battery regardless time. Based on average representative 6 days, saving rate approximately 26.0% 41.8% BESS.