Next Slideshow Best Blue Flowers for Your Garden Best Blue Flowers for Your GardenBest Blue Flowers for Your Garden Blue flowers add a cool touch to the landscape. Get the names of blue flowers and learn how to grow different types of blue flowers in your garden.
Solar panels should always face true south if you are in the northern hemisphere, or true north if you are in the southern hemisphere. True north is not the same as magnetic north. If you are using a compass to orient your panels, you need to correct for the difference, which varies from place to place.
The panel will collect solar radiation most efficiently when the sun's rays are perpendicular to the panel's surface. The angle of the sun varies throughout the year, as illustrated in Figure 9. Therefore, the optimal tilt angle for a PV panel in the winter will differ from the optimal tilt angle for the summer.