For the Sanyo and Silicon Energy modules I've worked with, it is a very small amount of light that actually passes through in the gaps between the cells. You could do a simple ratio calculation by measuring the area of the gaps and the area of the cells. Just guessing, I would say about 3-4%, if that. I wouldn't count on getting much daylight under the array except for what bounces in from underneath. Depending on the height of the array and reflectivity of nearby surfaces, the reflected light under the array can be significant. Hope this helps.
-Hans From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Keith Cronin Sent: Tuesday, November 01, 2011 1:04 PM To: RE-Wrenches Subject: [RE-wrenches] Bifacial modules Hi Was wondering if any of you have installed bifacial modules and know what the % of light that comes through to a surface below the modules? Looking for a canopy type of installation/ application and wondered if you have any #'s? Thank you~ Aloha, Keith
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