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<DIV><FONT size=2 face=Arial>I also like Bill Brooks' test. I use a
Daystar irradiance meter to determine light levels through glazing or
PV modules by measuring the light throughout the day and at the distance
from the glazing and height of whatever is being
illuminated.</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=ray@solarray.com href="mailto:ray@solarray.com">Ray Walters</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <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> Thursday, November 03, 2011 11:54
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] Bifacial
modules</DIV>
<DIV><BR></DIV>Geez Joel, we need to start a solar museum for all the cool old
stuff you have. <BR>I just did a bit of research, and it seems lux is a
weighted measure based on visible light present, while irradiation is more a
total power measurement. I guess we really need to have two different meters
to measure how much light passes through a module.<BR>If we were to go a step
further and characterize the quality of light present, we might need a
spectral analyzer to determine whether its "cool white" or "daylight", etc. As
always, the more you think about something, the more complicated it
becomes.<BR><BR>Ray Walters<BR><BR>On 11/3/2011 11:39 AM, Joel Davidson wrote:
<BLOCKQUOTE cite=mid:FFE6CAA776B146A7B1880793FC1B2EA2@JOEL type="cite">
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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> </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"
moz-do-not-send="true">http://www.metropolismag.com/story/20040727/pv-tv-a-multifunctional-eco-friendly-building-material</A></FONT></DIV>
<DIV> </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"
moz-do-not-send="true">http://www.solardesign.com/library/pdf/tiger-woods-solar-curtain-wall.pdf</A></FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>Also, opaque cell solar modules are
manufactured with various cell spacings for BIPV applications.</FONT></DIV>
<DIV> </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> </DIV>
<DIV><FONT size=2 face=Arial>Joel Davidson</FONT></DIV>
<DIV> </DIV>
<DIV> </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"
moz-do-not-send="true">Keith Cronin</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=solarphil@gmail.com
href="mailto:solarphil@gmail.com" moz-do-not-send="true">Phil
Undercuffler</A> ; <A title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org"
moz-do-not-send="true">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 <A
class=moz-txt-link-rfc2396E
href="mailto:solarphil@gmail.com"><solarphil@gmail.com></A><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> Keith Cronin <A
class=moz-txt-link-rfc2396E
href="mailto:electrichi01@yahoo.com"><electrichi01@yahoo.com></A>;
RE-wrenches <A class=moz-txt-link-rfc2396E
href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></A><BR><B><SPAN
style="FONT-WEIGHT: bold">Cc:</SPAN></B> Bill Brooks <A
class=moz-txt-link-rfc2396E
href="mailto:billbrooks7@yahoo.com"><billbrooks7@yahoo.com></A><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 moz-do-not-send="true"
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
moz-do-not-send="true"
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
moz-do-not-send="true"
ymailto="mailto:electrichi01@yahoo.com">electrichi01@yahoo.com</A>>;
'RE-wrenches' <<A href="mailto:re-wrenches@lists.re-wrenches.org"
rel=nofollow target=_blank moz-do-not-send="true"
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 moz-do-not-send="true"
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 moz-do-not-send="true"
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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