How much energy will my system produce? Maximum production occurs when the sun is highest. On a daily basis, production starts at sunrise, reaches its peak around noon, then declines until it reaches zero at sunset. During the year the sun provides the most energy around the summer solstice (June 20) and the least around the winter solstice (December 20). Weather, snow, shading and other factors will impact production. After we conduct an assessment of your roof, we will show you our predicted month by month energy production for your system.