Deciduous trees provide nearly full shade during the summer, sparse shade in the winter and filtered shade in Fall and Spring. Tree size and species will affect the timing and intensity of this variation. The SunEye does not account for this variation in shade. If a bare tree is in the sunpath, it is recommended that the tree be painted green as if it were solid shade, or evergreen. This yields a conservative estimate of solar access and helps prevent the risk of providing a system that generates less energy than the design goal. For example, with deciduous trees to the south of a south facing array, more energy will reach modules in the winter than expected by modeling the trees as full shade in the winter.  This effect is less important from an economic point of view since most incentive programs consider the summer months more than the winter months due to the larger demand on the power grid.

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