A Planning Study Of Off-Grid Based Rooftop Solar Power Generation System (PLTS) On Residential Houses Using PVSyst
Abstract
Solar energy is a renewable energy source that is abundant, environmentally friendly, and has great potential to be utilized, especially in tropical areas such as Indonesia. This research aims to design and analyze an off-grid rooftop solar power generation system (PLTS) for residential houses in Medan City using PVSyst software. The research location is at the coordinates of Latitude 3.5951°N and Longitude 98.6722°E, with the tilt angle of the solar panel adjusted at 30° (following the slope of the roof of the house) and the facing direction to the south with an azimuth angle of 180°. The PV modules used are monocrystalline silicon type (STP 250S-20/Wd+) with a total capacity of 3 kWp. The system is designed to meet a daily energy demand of 7.1 kWh/day and an annual demand of 2,598 kWh. The system configuration includes 12 PV modules, a battery with a capacity of 800 Ah (24 V), and an inverter to support standalone operation for 2.2 days without energy input from the solar panels. Simulation results show that the system generates an average energy of 9.1 kWh/day, with a Performance Ratio (PR) of 0.544 (54.4%). The main losses include losses in the PV Array (0.75 kWh/kWp/day), losses in the solar system (0.22 kWh/kWp/day), and unused energy of 1.01 kWh/kWp/day. Solar Fraction reached 99.7%, with Missing Energy of 6.972 kWh due to weather variations. This research shows that off-grid rooftop solar PV can be an effective solution to meet residential energy needs, reduce carbon emissions, and support the transition to a cleaner and more sustainable energy system.
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https://ejournal.seaninstitute.or.id/index.php/InfoSains/article/view/3839
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