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The purpose of this research is to develop on-grid engineering design of 52,5 KW solar photovoltaic system on Industrial Rooftop Building. The development of solar photovoltaic system is to satisfy high demand of electrical energy for industry, offices, and public with minimum cost. Taking consideration of green energy, solar energy might be chosen as an alternative to generate electric power by utilization of rooftop on industrial building. This research was conducted using broad database of meteorological data i.e. global daily horizontal solar irradiance. Additionally, rooftop photovoltaic development, Single Line Diagram, layout plan, photovoltaic array connection, and structure support photovoltaic module were developed using Helioscope and PV Syst software. Based on 6 months period simulation, annual energy produced on rooftop is 1043.88 kWh/kWp, global Horizontal Irradiance (GHI) 1301.96 kWh/m2, actual Global Horizontal Irradiance 5.6%, and performance ratio (PR) 80.30 % and capital rooftop photovoltaic project forecast. This result can be used for industrial and big office in west Indonesian recommendation to develop solar energy system on rooftop building