Rooftop solar projects are often complex due to limited space and the fact that rooftops were not initially designed for solar installations. A detailed engineering design is crucial for planning the entire solar project on an existing rooftop, ensuring maximum stability against environmental factors like wind loads. It includes all necessary wiring and earthing diagrams to connect the system smoothly with existing LT panels and the electrical grid network. The design also includes a comprehensive BOQ and financial model, optimizing project costs and projecting financial performance for the next 25 years.