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<div class="moz-cite-prefix">Hi John;<br>
<br>
Would we not need an MPPT controller, just a regular PWM type,
then? That might be a solution for these democracy arrays.<br>
<br>
Ray<br>
<br>
On 1/24/2013 3:16 PM, John Berdner wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Alan:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You
can also use one of our Optimizers with IndOp.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This
will buck of boost the module voltage to match the battery
voltage.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Still
would need some form of charge control to protect the
battery but this would provide an easy way to add new 60
cell modules to an existing 72 cell array.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Feel
free to contact me if you have any questions.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best
Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">John
Berdner<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">General
Manager, North America<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><img
alt="SmallBannerPictEngnew" id="Picture_x0020_1"
src="cid:part1.02040403.05090405@solarray.com"
height="113" width="468"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">SolarEdge
Technologies, Inc.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">3347
Gateway Boulevard, Fremont CA 94538 USA </span><b><i><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#C00000">(*Please
note of our new address.)</span></i></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><br>
T: 510.498.3200, X 747<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">M:
530.277.4894 <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>Allan Sindelar<br>
<b>Sent:</b> Thursday, January 24, 2013 11:35 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> [RE-wrenches] 24V Module Query<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Wrenches,<br>
We have years of installing 36-cell (12V) and 72-cell (24V)
modules for battery-based customers. Most of our systems are
24V or 48V nominal. Over the last few years, sources of
conventionally-sized 72-cell modules have dried up - as
cells have increased in size, most modules and most newer
factory production lines have either gone to 60-cell (20V)
modules, or 72 cells in 300+ watt ranges. It seems that the
formerly common 72 cell, 24V modules in the 150-190 watt
range, which are well-suited to integrating into existing
systems, are no longer available.<br>
<br>
60-cell modules in the common 220-250 watt range can't be
added to an existing system unless run through a dedicated
MPPT charge controller that can convert voltage, such as an
FM, XW60, Classic or TriStar; the added cost of any of these
controllers cancels out the low prices of the modules.<br>
<br>
Who continues to manufacture 72-cell modules? Which
distributors carry them?<br>
I am aware of three options - are there more?<br>
- Sunpower makes one module in the 245 watt range that
can be used negative ground, but it's very high efficiency
(and with high Voc/Vmp as well) and very pricey;<br>
- Sanyo/Panasonic has 225-240 watt modules, but also
quite premium and pricey;<br>
- Ameresco bought the rights to manufacture many former
BP modules, and I think they make some. But we had to
replace lots of failed BP modules in that size range, and
are hesitant to use their technology, fearing that the
problems may persist in the continued line.<br>
<br>
Thank you for any discussion and recommendations.<br>
Allan<o:p></o:p></p>
<div>
<p class="MsoNormal">-- <br>
<b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a moz-do-not-send="true"
href="mailto:Allan@positiveenergysolar.com"><span
style="color:#000099">Allan@positiveenergysolar.com</span></a></span><br>
<span style="font-size:10.0pt">NABCEP Certified
Photovoltaic Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder and Chief Technology Officer<br>
<b>Positive Energy, Inc.</b><br>
3209 Richards Lane (note new address)<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a moz-do-not-send="true"
href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span>
<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-right:722.25pt;mso-margin-bottom-alt:auto"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
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