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<DIV><FONT size=2 face=Arial>See-thru solar cells have been around for decades.
Arco Solar made 4% efficient amorphous silicon modules and car sunroofs in 1984
that were tinted brown like sunglasses. I got a 12-inch square
see-thru laminate that still works.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I also have a 6.75-inch square sample of
MSK Corp's amorphous silicon PV-TV solar panels. They were developed
in conjunction with Kaneka and Japanese architects Taiyo Industries.
The full-size glass panels, measure 1-meter square. In addition
to producing electricity, they provide thermal insulation, solar heat
gain protection and protection from ultra violet rays. During the manufacturing
process, a laser inscribes a series of ultra fine lines onto the panel
to allow 10 percent of visible light to be transmitted through the glass,
enough for sufficient light to enter a building even during cloudy conditions
while protecting against excessive solar gain. Amorphous silicon solar
cells with 10 percent, 5 percent or 1 percent transparency are placed
between two sheets of glass to generate power. This solar panel
is called PV-TV because it is also used as a display screen on the outside
of buildings. See <A
href="http://www.metropolismag.com/story/20040727/pv-tv-a-multifunctional-eco-friendly-building-material">http://www.metropolismag.com/story/20040727/pv-tv-a-multifunctional-eco-friendly-building-material</A></FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>The Tiger Woods Learning Center in Anaheim and
other buildings have see-thru Schott solar modules with different amounts
of transparency. See <A
href="http://www.solardesign.com/library/pdf/tiger-woods-solar-curtain-wall.pdf">http://www.solardesign.com/library/pdf/tiger-woods-solar-curtain-wall.pdf</A></FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Also, opaque cell solar modules are
manufactured with various cell spacings for BIPV applications.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I have a Mastech Light Meter LX1010B in
my tool kit for measuring lux. This handy tool costs around
$20.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Joel Davidson</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=electrichi01@yahoo.com href="mailto:electrichi01@yahoo.com">Keith
Cronin</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=solarphil@gmail.com
href="mailto:solarphil@gmail.com">Phil Undercuffler</A> ; <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, November 02, 2011 9:50
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] Bifacial
modules</DIV>
<DIV><BR></DIV>
<DIV
style="BACKGROUND-COLOR: #fff; FONT-FAMILY: times new roman, new york, times, serif; COLOR: #000; FONT-SIZE: 12pt">
<DIV><SPAN>Thanks everyone for the feedback!</SPAN></DIV>
<DIV><SPAN><BR></SPAN></DIV>
<DIV><SPAN>Thinking that the manu's can space cells accordingly on the surface
of the glass and create whatever % light the end user wants to seep
through.</SPAN></DIV>
<DIV><SPAN><BR></SPAN></DIV>
<DIV><SPAN>The % of light must slide between 5-15%, depending on manu's specs.
Architecture can meet solar and increase the applicability of the
products.</SPAN></DIV>
<DIV><SPAN><BR></SPAN></DIV>
<DIV><SPAN>Perhaps someday, they can make the cells see-through (or almost),
like glass.......? Now that opens up possibilities! </SPAN></DIV>
<DIV> </DIV>
<DIV>Aloha,<BR><BR></DIV>
<DIV>Keith<BR>
<DIV
style="FONT-FAMILY: 'times new roman', 'new york', times, serif; FONT-SIZE: 12pt">
<DIV style="FONT-FAMILY: 'times new roman', 'new york',
times, serif; FONT-SIZE: 12pt"><FONT size=2 face=Arial>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Phil Undercuffler
<solarphil@gmail.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">Cc:</SPAN></B> Bill Brooks
<billbrooks7@yahoo.com><BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, November 2, 2011 9:18
AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [RE-wrenches]
Bifacial modules<BR></FONT><BR>
<DIV id=yiv986221286><FONT class=yiv986221286Apple-style-span
face="arial, helvetica, sans-serif">We've got an array of Silicon Energy
modules "out back," and in the interests of scientific discovery and
procrastinating from what I really am supposed to be doing, Kelly, Seth and I
just ran a few experiments to see if we can quantify the amount of irradiation
that makes it through the array.</FONT>
<DIV><FONT class=yiv986221286Apple-style-span
face="arial, helvetica, sans-serif"><BR></FONT></DIV>
<DIV><FONT class=yiv986221286Apple-style-span
face="arial, helvetica, sans-serif">Using a Kyocera module as our reference,
we measured ISC with the module in the plane of the array, then moved the
module to the same orientation but approximately 12 feet behind and in the
shade of the SE array, and again measured ISC. Sun conditions were light
wispy clouds, guesstimated 800 W/M2 (pretty darned good for Arlington WA this
time o' year), 10:30 local time. We measured 5.9A ISC in front of the
array, and 610 milliamps when in the shade the array, leading us to say that
just over 10% of the available sun will make it to your orchids.</FONT></DIV>
<DIV><FONT class=yiv986221286Apple-style-span
face="arial, helvetica, sans-serif"><BR></FONT></DIV>
<DIV><FONT class=yiv986221286Apple-style-span
face="arial, helvetica, sans-serif">It should be noted that there is a opaque
backing behind each SE cell, so the only light that makes it through is
through the intercell gaps. I've used Sanyo doubles before, and in those
modules the cells are slightly translucent, so the sun is somewhat visible
through the body of the cell itself as well -- sort of like looking through
very dark sunglasses. In either case, the illumination on objects behind
the array is a dappled, dynamic light. As Bill says, it's pretty cool
from an aesthetic point of view. My personal .02 is that there is no
finer place to put an array than a shade structure using clear modules.
It keeps everything off the roof, gives shade and makes for a premium
installation option.</FONT>
<DIV><FONT size=2><FONT face=arial,helvetica,sans-serif><BR
clear=all></FONT></FONT>Phil
<DIV>-----------</DIV>
<DIV><SPAN
style="LINE-HEIGHT: 15px; FONT-FAMILY: Arial, Helvetica, sans-serif; FONT-SIZE: 12px">"</SPAN><SPAN
style="LINE-HEIGHT: 15px; FONT-FAMILY: Arial, Helvetica, sans-serif; FONT-SIZE: 12px">When
we learn how to store electricity, we will cease being apes ourselves; until
then we are tailless orangutans. You see, we should utilize natural forces and
thus get all of our power. Sunshine is a form of energy, and the winds and the
tides are manifestations of energy. </SPAN><SPAN
style="LINE-HEIGHT: 15px; FONT-FAMILY: Arial, Helvetica, sans-serif; FONT-SIZE: 12px">Do
we use them? Oh, no! We burn up wood and coal, as renters burn up the front
fence for fuel. We live like squatters, not as if we owned the property.
</SPAN></DIV>
<DIV><SPAN
style="LINE-HEIGHT: 15px; FONT-FAMILY: Arial, Helvetica, sans-serif; FONT-SIZE: 12px"><BR></SPAN></DIV>
<DIV><SPAN
style="LINE-HEIGHT: 15px; FONT-FAMILY: Arial, Helvetica, sans-serif; FONT-SIZE: 12px"></SPAN><SPAN
style="LINE-HEIGHT: 15px; FONT-FAMILY: Arial, Helvetica, sans-serif; FONT-SIZE: 12px">There
must surely come a time when heat and power will be stored in unlimited
quantities in every community, all gathered by natural forces."</SPAN></DIV>
<DIV><SPAN
style="LINE-HEIGHT: 15px; FONT-FAMILY: Arial, Helvetica, sans-serif; FONT-SIZE: 12px">--
Thomas Edison --</SPAN></DIV><BR><BR><BR>
<DIV class=yiv986221286gmail_quote>On Tue, Nov 1, 2011 at 7:48 PM, Keith
Cronin <SPAN dir=ltr><<A href="mailto:electrichi01@yahoo.com" rel=nofollow
target=_blank
ymailto="mailto:electrichi01@yahoo.com">electrichi01@yahoo.com</A>></SPAN>
wrote:<BR>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=yiv986221286gmail_quote>
<DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: 'times new roman', 'new york', times, serif; COLOR: rgb(0,0,0); 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><FONT color=#888888>Keith<BR></FONT>
<DIV style="FONT-SIZE: 12pt">
<DIV style="FONT-SIZE: 12pt">
<DIV><FONT size=2 face=Arial>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Bill Brooks <<A
href="mailto:billbrooks7@yahoo.com" rel=nofollow target=_blank
ymailto="mailto:billbrooks7@yahoo.com">billbrooks7@yahoo.com</A>><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> 'Keith Cronin' <<A
href="mailto:electrichi01@yahoo.com" rel=nofollow target=_blank
ymailto="mailto:electrichi01@yahoo.com">electrichi01@yahoo.com</A>>;
'RE-wrenches' <<A href="mailto:re-wrenches@lists.re-wrenches.org"
rel=nofollow target=_blank
ymailto="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</A>><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></DIV>
<DIV>
<DIV><BR>
<DIV>
<DIV>
<DIV>
<DIV><SPAN
style="FONT-FAMILY: sans-serif; COLOR: rgb(31,73,125); FONT-SIZE: 11pt">Keith,</SPAN></DIV>
<DIV><SPAN
style="FONT-FAMILY: sans-serif; COLOR: rgb(31,73,125); FONT-SIZE: 11pt"></SPAN> </DIV>
<DIV><SPAN
style="FONT-FAMILY: sans-serif; COLOR: rgb(31,73,125); FONT-SIZE: 11pt">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><SPAN
style="FONT-FAMILY: sans-serif; COLOR: rgb(31,73,125); FONT-SIZE: 11pt"></SPAN> </DIV>
<DIV><SPAN
style="FONT-FAMILY: sans-serif; COLOR: rgb(31,73,125); FONT-SIZE: 11pt">Nothing
wrong with bi-facials. They are beautiful to look at. I would buy them based
on aesthetics, not on performance.</SPAN></DIV>
<DIV><SPAN
style="FONT-FAMILY: sans-serif; COLOR: rgb(31,73,125); FONT-SIZE: 11pt"></SPAN> </DIV>
<DIV><SPAN
style="FONT-FAMILY: sans-serif; COLOR: rgb(31,73,125); FONT-SIZE: 11pt">Bill.</SPAN></DIV>
<DIV><SPAN
style="FONT-FAMILY: sans-serif; COLOR: rgb(31,73,125); FONT-SIZE: 11pt"></SPAN> </DIV>
<DIV>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<DIV><B><SPAN
style="FONT-FAMILY: sans-serif; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: sans-serif; FONT-SIZE: 10pt"> <A
href="mailto:re-wrenches-bounces@lists.re-wrenches.org" rel=nofollow
target=_blank
ymailto="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</A>
[mailto:<A href="mailto:re-wrenches-bounces@lists.re-wrenches.org"
rel=nofollow target=_blank
ymailto="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</A>]
<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> </DIV>
<DIV>
<DIV>
<DIV style="BACKGROUND: white"><SPAN
style="COLOR: black">Hi</SPAN></DIV></DIV>
<DIV>
<DIV style="BACKGROUND: white"><SPAN
style="COLOR: black"></SPAN> </DIV></DIV>
<DIV>
<DIV 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 style="BACKGROUND: white"><SPAN
style="COLOR: black"></SPAN> </DIV></DIV>
<DIV>
<DIV 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 style="BACKGROUND: white"><SPAN
style="COLOR: black"></SPAN> </DIV></DIV>
<DIV>
<DIV style="BACKGROUND: white"><SPAN style="COLOR: black">Thank
you~</SPAN></DIV></DIV>
<DIV>
<DIV style="BACKGROUND: white"><SPAN
style="COLOR: black"></SPAN> </DIV></DIV>
<DIV>
<DIV style="MARGIN-BOTTOM: 12pt; BACKGROUND: white"><SPAN
style="COLOR: black">Aloha,</SPAN></DIV></DIV>
<DIV>
<DIV style="BACKGROUND: white"><SPAN
style="COLOR: black">Keith</SPAN></DIV></DIV></DIV></DIV></DIV></DIV><BR><BR></DIV></DIV></DIV></DIV></DIV></DIV></DIV><BR>_______________________________________________<BR>List
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