Most commercial-grade solar panels are approximately 6 feet by 4 feet and weigh between 40–60 pounds. Each panel typically generates 400 to 700 watts of electricity depending on its efficiency, physical size, and type. A 100 kW system may require 250 to 300 panels, depending on layout and panel wattage. The total space required depends on panel spacing, tilt, and the roof or ground area available.