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Shading

Shading

It should come as no surprise that shading does have a significant effect on panel performance and impacts the overall output of a solar system. If a panel is shaded and wired in series (wired in a string) with other panels, then the output of all those panels in the array will be affected by the partial shading of one panel. Where possible the panels should be installed where there are no shading issues. This isn’t always possible due to immovable objects and unavailability of other roof areas. If you have shading the effects of this should be understood as there will be a loss of performance and a lower return with a possibility of damage to the affected panels.

A great example is the placement of an A4 piece of paper onto a panel. When measuring IV-curve a single A4 piece of paper reduced the string output performance by 10% and an A3 piece of paper reduced it by 18%. This is a very valid reason to ensure a consultant actually visits the site and checks for any shading issues. A satellite inspection via Google Earth or Near Maps will not sufficiently identify shading issues. 30 North has state of the art site analysis tools to evaluate your site for shading taking into account annual sun paths and irradiation for your longitude and latitude. Contact us for an In-home Consultation today or to have your system tested for safety and performance.

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