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<div class=Section1>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Larry,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>You’re absolutely right in your
first paragraph about one thing that I stated incorrectly: MPPT </span></font>is
for harvesting the most power possible from any voltage being produced above
the battery voltage. I meant the difference between Vmp and Vbatt, not, not the
difference between Voc and Vmp. Thanks for catching that. Sorry all.<o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>In a hot climate the MPPT benefit is greatest if the array is wired at
a higher nominal voltage than the battery. Hot 12V or 24V modules don’t
have enough of a voltage window between Vmp and Vbatt to justify MPPT, and a
tropical climate seldom takes advantage of the higher Vmp of cool/cold modules
that temperate winters provide. Larry, this is just my opinion, and I respect
yours, given that you work in the hottest year-round climate in the mainland US
there in southern <st1:State w:st="on"><st1:place w:st="on">Arizona</st1:place></st1:State>,
don’t you? (You must get tired of people making bad jokes and then asking
where’s your sense of <st1:place w:st="on"><st1:City w:st="on">Yuma</st1:City></st1:place>,
I ‘spect.)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>The SB series uses an adjustable analog boost that is limited to a
fairly narrow range. Even ancient Arco M52L Quad-Lams, with a Vmp around 44V,
exceeded this adjustment range on 24 in-24 out – I tried this years ago.</span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>I have no challenge to Blue Sky’s
support – I have even called Rick on his cell phone on a Sunday and
gotten answers I have needed. He knows his stuff, has never refused to help,
and has occasionally sent us products to try and givefeedback on.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>But we have just seen enough failures on
units 4-10 years old where installation errors couldn’t be blamed and
lightning protection was in place. I have never seen a single failure among the
few SB2000 or SB3024i units we’ve installed or sold. The 3048 has shown
the highest failure rate, although certainly not higher than other
well-regarded units. But the failures have always required sending the units in
for service, and my guess is that that would be practically impossible in <st1:place
w:st="on"><st1:country-region w:st="on">Senegal</st1:country-region></st1:place>.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Thank you for catching my mistake.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Allan<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Allan Sindelar<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'><a
href="mailto:Allan@positiveenergysolar.com">Allan@positiveenergysolar.com</a></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'>NABCEP Certified Photovoltaic Installer</span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'>EE98J Journeyman Electrician</span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Positive Energy, Inc.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>3201 Calle Marie<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>Santa
Fe</span></font></st1:City><font color=black><span style='color:black'>, <st1:State
w:st="on">New Mexico</st1:State> <st1:PostalCode w:st="on">87507</st1:PostalCode></span></font></st1:place><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>505 424-1112<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><a
href="http://www.positiveenergysolar.com">www.positiveenergysolar.com</a></span></font><o:p></o:p></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Larry Crutcher, Starlight Solar<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, June 30, 2009 12:45
PM<br>
<b><span style='font-weight:bold'>To:</span></b> RE-wrenches<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [RE-wrenches] Solar
Boost Controller in <st1:country-region w:st="on"><st1:place w:st="on">Senegal</st1:place></st1:country-region></span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Allan,<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>MPPT technology is for harvesting the most power possible from any
voltage being produced above the battery voltage, not the difference between
Voc and Vmp. Because of this, nearly every battery charging system will benefit
from MPPT chargers. The climate does not matter for properly designed
systems. In a hot climate (like <st1:City w:st="on"><st1:place w:st="on">Yuma</st1:place></st1:City>
;) ) you want a much higher operating voltage from the PV panels. There will
still be a big advantage from MPPT. There are very few situations where I would
recommend a non-MPPT controller anymore.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Concerning Blue Sky charge controller failures, I have sold and
installed over 1000 BSE products at our retail store over the years and they
have the LOWEST failure of any controllers we have sold. And, the customer
service is second to no one else. I understand and agree with your opinion to
have serviceable equipment in remote locations. The most reliable
equipment should be considered first. I also believe that a project like the
one Walt is dealing with should have included spare equipment as part of sale,
and, of course, it should have been designed right. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I had a Phocos MPPT 100/20 in a test setup for 10 months when it
failed. I can't even begin to talk about Outback problems unless I take my
comments to the RE-bitching list. The BSE 3048 would be a
good replacement controller because it has the same footprint as the
SB50 and will handle the high Voc.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div><span style='orphans: 2;text-align:auto;widows: 2;-webkit-border-horizontal-spacing: 0px;
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<div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>Kindest Regards,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>Larry Crutcher<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>Starlight Solar<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>(928) 941-1660<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>Renewable Energy
Products, Service and Installation<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>Mailing Address (NO
SHIPPING):<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=1
color=black face=Helvetica><span style='font-size:9.0pt;font-family:Helvetica;
color:black'>11881 S Fortuna Rd.</span></font></st1:address></st1:Street><font
size=1 color=black face=Helvetica><span style='font-size:9.0pt;font-family:
Helvetica;color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>#210<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=1
color=black face=Helvetica><span style='font-size:9.0pt;font-family:Helvetica;
color:black'>Yuma</span></font></st1:City><font size=1 color=black
face=Helvetica><span style='font-size:9.0pt;font-family:Helvetica;color:black'>,
<st1:State w:st="on">AZ</st1:State> <st1:PostalCode w:st="on">85367</st1:PostalCode></span></font></st1:place><font
size=1 color=black face=Helvetica><span style='font-size:9.0pt;font-family:
Helvetica;color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'><o:p> </o:p></span></font></p>
</div>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'>Shipping and retail
store (NO MAIL):<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=1
color=black face=Helvetica><span style='font-size:9.0pt;font-family:Helvetica;
color:black'>2998 Shari Ave</span></font></st1:address></st1:Street><font
size=1 color=black face=Helvetica><span style='font-size:9.0pt;font-family:
Helvetica;color:black'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=1
color=black face=Helvetica><span style='font-size:9.0pt;font-family:Helvetica;
color:black'>Yuma</span></font></st1:City><font size=1 color=black
face=Helvetica><span style='font-size:9.0pt;font-family:Helvetica;color:black'>,
<st1:State w:st="on">AZ</st1:State> <st1:PostalCode w:st="on">85365</st1:PostalCode></span></font></st1:place><font
size=1 color=black face=Helvetica><span style='font-size:9.0pt;font-family:
Helvetica;color:black'><o:p></o:p></span></font></p>
</div>
</div>
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<p class=MsoNormal><font size=2 color=black face="Lucida Sans"><span
style='font-size:10.5pt;font-family:"Lucida Sans";color:black'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'></span><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Jun 30, 2009, at 12:01 PM, Allan Sindelar wrote:<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br>
<o:p></o:p></span></font></p>
<span style='orphans: 2;text-align:auto;widows: 2;-webkit-border-horizontal-spacing: 0px;
-webkit-border-vertical-spacing: 0px;-webkit-text-decorations-in-effect: none;
-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:
0px'><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region"><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="Street"><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PostalCode"><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="address"><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City">
<div link=blue vlink=blue style='word-wrap: break-word;-webkit-nbsp-mode: space;
-webkit-line-break: after-white-space'>
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<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Walt,<u1:p></u1:p><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>I would also offer that in a hot climate,
MPPT in general is only useful in a case where odd cell counts take the Vmp
away from 24V nominal specs. That is, MPPT was originally developed to harvest
the voltage headroom between Voc and Vmp, which was greatest in cold ambient
temperatures. There is little benefit to MPPT in a tropical climate, unless
it’s being used (incorrectly in this case) to adapt a particular module
with odd cell count.<u1:p></u1:p><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><u1:p> </u1:p><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Walt, I would suggest that you consider
pursuing replacing the Sharps with any 12Vnom or 24Vnom module commonly in use
there, and then either keep the SB50 because it’s already there, or
replace it with the most reliable non-MPPT PWM controller you can bring in or
find in country. This maximizes the likelihood that the system can be kept in
operation even if the SB50s fail (and experience says that some will in time)
and the locals can’t get service or replacement product. It seems to me
that the SB50 is an unnecessarily complex component for this application, and a
standard PWM replacement controller will match poorly and inefficiently to the
Sharps.<u1:p></u1:p><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><u1:p> </u1:p><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>FYI, I called Earthwalk and spoke with
“Joey” there. I copied him on Rick’s email, and got a read
response. So Earthwalk is aware of this situation, although Joey was a computer
tech, not one of the “solar experts”. If they have integrity,
they’ll contact you and start making arrangements to get this resolved.
Perhaps they can wire you the funds to purchase compatible modules locally?<u1:p></u1:p><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><u1:p> </u1:p><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>I have copied Joey on this message as well.<u1:p></u1:p><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><u1:p> </u1:p><o:p></o:p></span></font></p>
</div>
<div>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Allan Sindelar<u1:p></u1:p><o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'><a
href="mailto:Allan@positiveenergysolar.com">Allan@positiveenergysolar.com</a></span></font><font
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<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'>NABCEP Certified Photovoltaic Installer</span></font><font
color=black><span style='color:black'><u1:p></u1:p><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'>EE98J Journeyman Electrician</span></font><font
color=black><span style='color:black'><u1:p></u1:p><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Positive Energy, Inc.<u1:p></u1:p><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>3201 Calle Marie<u1:p></u1:p><o:p></o:p></span></font></p>
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<div><st1:place u2:st="on"><st1:city u2:st="on">
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>Santa
Fe</span></font></st1:City><font color=black><span style='color:black'></st1:city>,<span
class=apple-converted-space> <st1:state u2:st="on"></span><st1:State
w:st="on">New Mexico</st1:state></st1:State><span class=apple-converted-space> <st1:postalcode u2:st="on"></span><st1:PostalCode
w:st="on">87507</st1:postalcode></st1:PostalCode></span></font></st1:place><font
color=black><span style='color:black'><u1:p></u1:p><o:p></o:p></span></font></p>
</st1:place></div>
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<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>505 424-1112<u1:p></u1:p><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><a
href="http://www.positiveenergysolar.com">www.positiveenergysolar.com</a></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
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