Technical-economic and environment benefit analyses of a novel building attached photovoltaic system.

This study proposed a novel building attached photovoltaic (BAPV) system mainly comprised of the PV system, building with household appliances, electric vehicle (EV), and power grid. Effect analyses of four typical factors are conducted, including the number of batteries, PV system supporting type, azimuth, and tilt angles of PV panels. The results show that the BAPV system with 8 batteries, an open PV system supporting type, an azimuth angle of 0°, and a tilt angle of 30.5° is relatively optimal. The operation, economic, and environment benefit performances of the BAPV system are analyzed. The results reveal that the annual effective output electricity of the BAPV system is 58.3 MWh, of which about 20 MWh is consumed by household appliances and EV or stored in batteries, and 38.3 MWh is sold to the power grid. The annual performance ratio of the BAPV system is 82.7%. Based on the annual nominal power generation quantity of the PV system, the effective output electricity occupies about 89%, and the energy loss part occupies 11%. The levelized cost of electricity (LCOE) and cost recovery cycle of the BAPV system are 0.132 yuan/kWh and 8.7 years, respectively. For the whole lifetime, the emission reduction quantities of carbon dioxide, dust, sulfur dioxide, and nitrogen oxide of the BAPV project are 786.3 t, 4.225 t, 7.275 t, and 6.9 t. The results of this study demonstrate the technical and economic feasibilities as well as the acceptable environmental protection performance of the proposed BAPV system, and this paper will contribute to the research and development works of BAPV systems.