What is the best angle for solar panels?

        November 6, 2015 Cost of Solar | Global | renewables: solar

A sun-facing roof is best for fixed solar panels, but not all roofs are so orientated and the sun moves. Without an adjustable tracker, the best angle is 90 degrees minus one's latitude, but parallel to a pitched roof is simplest. Sunset-facing panels are also okay as they function at high demand. Tilting panels down in winter and up in summer also helps.