The orientation of solar panels is an important factor to optimize energy production from solar panels. The direction that solar panels face depends on the part of the hemisphere. In the northern hemisphere, the main rule is to face solar panels true south. Mostly it is the best direction as long as there are no shadings affected by physical objects such as buildings, constructions, or trees during the day. In the southern hemisphere, solar panels should face the north. The other important consideration is the appropriate tilt. Solar radiation should hit the surface of solar panels perpendicular to produce the most energy.