Journal of the Korean Solar Energy Society ISSN:1598-6411(Print) 2508-3562(Online) 한국태양에너지학회 논문집

The Seoul metropolitan area and many local governments are supporting a project that involves installing and using PV (Photovoltaic) modules on the balconies of apartment houses in Korea. The power capacity of the installed PV is generally 300 W (a single PV module) per household. If the power capacity of the PV module is larger than the peak load of the household during the PV generation time, the surplus power cannot be utilized. Therefore, the necessity of a battery energy storage system (BESS) that can utilize the PV surplus power is being increasingly felt. In this study, we analyzed the economic efficiency of the residential BESS connected to a balcony- PV using HOMER (Hybrid Optimization of Multiple Energy Resources) software in Korea. The simulation was conducted for five cases in which the price of each component of BESS with balcony-PV and the limit installation capacity of the PV module were variable. As a result, when the balcony-PV and residential BESS were 50% (915,000 won) lower than the current price (1,830,000 won) and a PV with a power capacity of 1.2 kW was installed, the electric power charge was reduced by 34.2% (NPC 10,207,600 won) and the payback period required 4.09 years compared with the pre-installation times (NPC 15,519,570 won).