george Posted March 22, 2015 Share Posted March 22, 2015 Hi,POA ground reflected radiation from your website, has the following formula: Eg = ((GHI x albedo x (1-cos(surfaceTiltAngle))/2) Albedo is defined as a reflection coefficient of a ground surface.But can it also be a reflection coefficient of a roof surface? A flat roof for example?What about the sloped roof? If a PV panel is close (flush) roof mounted on a sloped roof (check the attached photo for an example), then an albedo should be albedo of that sloped roof surface? In this example, albedo of red roof tiles (0.33)? Is this correct? Or should I albedo of the ground bellow the roof be used instead?Thank you for the reply.Flush mount PV array on red roof tiles Link to comment Share on other sites More sharing options...
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