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Solar panels converts sunlight into electricity, it's important that they have a direct and unobstructed source of light shining down on them at all times. Any sort of obstruction will result in reducing the overall efficiency of the system and ultimately lowers the energy output.
A high level of shading that reduces the energy output means that it will prolong the return of investment much longer than it should take. In addition, too much shading means the system isn't converting as much sunlight as possible.
Think of a string of solar panels as a pipe. In this case, the solar power running through the panels are like water flowing through the pipe. Using this metaphor, shading is analogous to a clog in the pipe, as the output of the entire string can be reduced to close to nothing if a shadow lingers over the solar panels. Worse, shading on even just one cell could potentially drop the entire panel's output to near zero.
Do you homework before any installation!