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On 1/17/2012 4:18 PM, benn kilburn wrote:
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boB,
<div>If this concept were to become a working option for the
Classic, would the modules have to be modified in any way?
Why are the diodes not blocking the reverse current?</div>
<div>benn<br>
<br>
<span class="ecxecxecxecxEC_Apple-style-span"
style="color:rgb(0, 32, 96)"><font
class="ecxApple-style-span" face="'Franklin Gothic
Medium'">DayStar Renewable Energy Inc. </font></span>
<div>
<div><font class="ecxApple-style-span" face="'Franklin
Gothic Medium'"><a class="moz-txt-link-abbreviated" href="mailto:benn@daystarsolar.ca">benn@daystarsolar.ca</a></font></div>
<div><font class="ecxApple-style-span" face="'Franklin
Gothic Medium'">780-906-7807 </font></div>
<div><font class="ecxApple-style-span" face="'Franklin
Gothic Medium'">HAVE A SUNNY DAY
</font></div>
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</div>
</blockquote>
<br>
<br>
<br>
No mods. However, as you can see, if the controller is maxed out as
far as<br>
array size, that could limit the snow melting effect. I don't have
any hard<br>
data as for the minimum power needed to apply to the array for snow
melting,<br>
but it could be around twice the power to melt snow as the power
rating of<br>
the array. Yesterday's experiment was less than 2wice the power
rating<br>
and it may have been fine with with even less, so that's a very good
sign.<br>
<br>
How much power does it take to melt snow off of a car's rear window
from<br>
the electric defroster ? It's a similar kind thing.<br>
<br>
Diodes ?? You mean the bypass diodes ?? No problem. Those don't<br>
conduct in this case.<br>
<br>
boB<br>
<br>
<br>
<br>
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<hr id="stopSpelling">Date: Mon, 16 Jan 2012 13:14:36 -0800<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:boB@midnitesolar.com">boB@midnitesolar.com</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><br>
Subject: Re: [RE-wrenches] Shedding ice<br>
<br>
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On 1/16/2012 11:39 AM, David Katz wrote:
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cite="mid:8767436DED006946A7206390E83D86220D9AD7AD37@VS-SJEXCH01.recsolar.local">
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</style> <font
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Mark,<br>
I believe the Midnite Classic has this feature built in.
Check with them.<br>
David Katz</font><br>
<br>
</blockquote>
<br>
<br>
It just snowed up here in Arlington, Washington A.C. and we
were just starting to melt some snow<br>
on a couple of modules on our roof just now with one of our
charge controllers here in the lab.<br>
<br>
This feature is not yet in the Classic, BUT, check out this
experiment that I did about 3 years ago<br>
in my front yard with an animated gif time lapse.<br>
<br>
One module is being powered and the other is not powered,
just sitting there for comparison.<br>
These are KC125s.<br>
<br>
The time involved here was about 3 hours and took about 1
kW-hour of energy but gives you<br>
an idea of what may be done with this idea. One thing not
in our favor here is that the module<br>
that is being powered is resting on the ground, in the snow,
which would significantly<br>
hinder snow melting I would think rather than being properly
mounted.<br>
<br>
Oh what fun it is to melt some PV snow tonight !<br>
<br>
<a moz-do-not-send="true" class="ecxmoz-txt-link-freetext"
href="http://fusion.midnitesolar.com/PVsnowMelt3.gif"
target="_blank">http://fusion.midnitesolar.com/PVsnowMelt3.gif</a><br>
<br>
boB<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<blockquote
cite="mid:8767436DED006946A7206390E83D86220D9AD7AD37@VS-SJEXCH01.recsolar.local">
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#B5C4DF\00000d\00000a 1.0pt;padding:3.0pt 0in 0in 0in">
<font
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""><b>From</b>:
Mark Dickson [<a moz-do-not-send="true"
class="ecxmoz-txt-link-freetext"
href="mailto:Mark@OasisMontana.com">mailto:Mark@OasisMontana.com</a>]
<br>
<b>Sent</b>: Monday, January 16, 2012 10:00 AM<br>
<b>To</b>: 'RE-wrenches' <a moz-do-not-send="true"
class="ecxmoz-txt-link-rfc2396E"
href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>
<br>
<b>Subject</b>: [RE-wrenches] Shedding ice <br>
</font> <br>
</div>
<div class="ecxSection1">
<p class="ecxMsoNormal"><font color="navy" face="Arial"
size="2"><span
style="font-size:10.0pt;font-family:Arial;color:navy">I
recall a conversation a while back about the
possibility of “reversing” the current in a solar
module to increase the cell temp enough to shed
ice/rime. To follow-up, has anybody been
successful at this? I am guessing, if so, it
would entail, removal of diodes, increasing PV and
battery capacity and some way to sense the ice at
the very least. . . It sounds good in theory, but
I am skeptical as to whether it will work in
reality. . .</span></font></p>
<p class="ecxMsoNormal"><font color="navy" face="Arial"
size="2"><span
style="font-size:10.0pt;font-family:Arial;color:navy"> </span></font></p>
<div>
<p class="ecxMsoNormal"><font color="navy" face="Comic
Sans MS" size="2"><span
style="font-size:10.0pt;font-family:"Comic\00000d\00000a
Sans MS";color:navy">Best regards,</span></font></p>
<p class="ecxMsoNormal"><font color="navy" face="Comic
Sans MS" size="2"><span
style="font-size:10.0pt;font-family:"Comic\00000d\00000a
Sans MS";color:navy"> </span></font></p>
<p class="ecxMsoNormal"><font color="navy" face="Comic
Sans MS" size="2"><span
style="font-size:10.0pt;font-family:"Comic\00000d\00000a
Sans MS";color:navy">Mark Dickson,</span></font><font
color="navy"><span style="color:navy"></span></font></p>
<p class="ecxMsoNormal"><font color="navy"
face="ArialMT" size="2"><span
style="font-size:10.0pt;font-family:ArialMT;color:navy">NABCEP
Certified Solar PV Installer ™</span></font></p>
<p class="ecxMsoNormal"><font color="navy" face="Comic
Sans MS" size="2"><span
style="font-size:10.0pt;font-family:"Comic\00000d\00000a
Sans MS";color:navy">Oasis Montana Inc.</span></font></p>
</div>
<p class="ecxMsoNormal"><font color="navy" face="Arial"
size="2"><span
style="font-size:10.0pt;font-family:Arial;color:navy"> </span></font><br>
</p>
</div>
</blockquote>
<br>
<br>
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