<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>Bill</span></div><div><span><br></span></div><div><span>Appreciate the feedback. One of the questions that I'm seeking to determine- how much light will filter through the spaces between the cells to the surface below?</span></div><div><span><br></span></div><div><span>Lets say for someone that wants to grow orchids- they need low light, as an example.</span></div><div><span><br></span></div><div><span>Wondering how much light is diffused through the panels to be able to do things like grow orchids and or have filtered light to work?</span></div><div><span><br></span></div><div><span>As an example: Do any of you have irradiance measurements on any carports that have done bifacials and determined how many watts sq m are below?</span></div><div><br></div><div>Keith<br><div style="font-size: 12pt; font-family: 'times new
roman', 'new york', times, serif; "><div style="font-size: 12pt; font-family: 'times new roman', 'new york', times, serif; "><font size="2" face="Arial"><hr size="1"><b><span style="font-weight:bold;">From:</span></b> Bill Brooks <billbrooks7@yahoo.com><br><b><span style="font-weight: bold;">To:</span></b> 'Keith Cronin' <electrichi01@yahoo.com>; 'RE-wrenches' <re-wrenches@lists.re-wrenches.org><br><b><span style="font-weight: bold;">Sent:</span></b> Tuesday, November 1, 2011 11:44 AM<br><b><span style="font-weight: bold;">Subject:</span></b> RE: [RE-wrenches] Bifacial modules<br></font><br>
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--></style><div><div class="yiv120406057WordSection1"><div class="yiv120406057MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: sans-serif; ">Keith,</span></div><div class="yiv120406057MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: sans-serif; "> </span></div><div class="yiv120406057MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: sans-serif; ">This is easy to test. Simple take an irradiance sensor, turn it upside-down and test the irradiance on the bottom surface of any PV array. It will vary greatly based on exposure to reflected light and so on, but it will rarely be above 100 W/m^2. 10% improvement is an absolute maximum for any bifacial technology, and that is on the high side. Any claims above 10% are ignoring the physics of sunlight, reflectance of typical materials, and PV.</span></div><div class="yiv120406057MsoNormal"><span style="font-size: 11pt;
color: rgb(31, 73, 125); font-family: sans-serif; "> </span></div><div class="yiv120406057MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: sans-serif; ">Nothing wrong with bi-facials. They are beautiful to look at. I would buy them based on aesthetics, not on performance.</span></div><div class="yiv120406057MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: sans-serif; "> </span></div><div class="yiv120406057MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: sans-serif; ">Bill.</span></div><div class="yiv120406057MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: sans-serif; "> </span></div><div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in;"><div class="yiv120406057MsoNormal"><b><span style="font-size: 10pt; font-family: sans-serif; ">From:</span></b><span style="font-size: 10pt;
font-family: sans-serif; "> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Keith Cronin<br><b>Sent:</b> Tuesday, November 01, 2011 1:04 PM<br><b>To:</b> RE-Wrenches<br><b>Subject:</b> [RE-wrenches] Bifacial modules</span></div></div></div><div class="yiv120406057MsoNormal"> </div><div><div><div class="yiv120406057MsoNormal" style="background:white;"><span style="color:black;">Hi</span></div></div><div><div class="yiv120406057MsoNormal" style="background:white;"><span style="color:black;"> </span></div></div><div><div class="yiv120406057MsoNormal" style="background:white;"><span style="color:black;">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?</span></div></div><div><div class="yiv120406057MsoNormal" style="background:white;"><span style="color:black;">
</span></div></div><div><div class="yiv120406057MsoNormal" style="background:white;"><span style="color:black;">Looking for a canopy type of installation/ application and wondered if you have any #'s?</span></div></div><div><div class="yiv120406057MsoNormal" style="background:white;"><span style="color:black;"> </span></div></div><div><div class="yiv120406057MsoNormal" style="background:white;"><span style="color:black;">Thank you~</span></div></div><div><div class="yiv120406057MsoNormal" style="background:white;"><span style="color:black;"> </span></div></div><div><div class="yiv120406057MsoNormal" style="margin-bottom:12.0pt;background:white;"><span style="color:black;">Aloha,</span></div></div><div><div class="yiv120406057MsoNormal" style="background:white;"><span style="color:black;">Keith</span></div></div></div></div></div></div><br><br></div></div></div></div></body></html>