Yearly average equivalent sun hours per day. Equivalent full sun hours per day for a four-week period from December 7th to January 4th. The diagram above illustrates the path of the sun over varying seasons. Remember when selecting a site for your solar modules to pick a spot that is clear of shade from a minimum of 10 A.M. to 2 P.M. on December 21st. Even a limb from a deciduous tree will substantially reduce power output.
Many solar sites are quite uncomplicated in terms of shading and aspect.
You may already have a good idea of where the sun appears in the morning and disappears in the evening, as well as how low it swings in the winter sky. If your site is partially shaded, it may be necessary to determine exactly where the best placement of modules will be. We do have site analysis tools. If you need a more sophisticated site analysis, please contact us. We also have world-wide insolation data as well as more local data that can be useful for your particular location.