For Hemant Nema's house, a 3 kW residential solar system can generate 12-15 units/day, saving ?15,000-20,000/year. It reduces carbon footprint and has a payback period of 5-7 years. Suitable for 2-3 BHK homes with moderate energy needs, it requires 150-200 sqft rooftop area. The system includes 8-10 solar panels, an inverter, and mounting structure. With minimal maintenance, it lasts up to 25 years. Hemant can expect a significant reduction in electricity bills and a reliable source of renewable energy. Initial investment is around ?1.5-2 lakhs, depending on the quality of equipment and installation.