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Luke,<br>
I deleted your first message, but I thought you wrote that the
system was pre-MPPT, with strings wired as 4 12 Vnom in series. IT
seems to me that given insufficient Vmp, a modern controller is a
no-brainer anyway, and it's only a matter to which one to use.<br>
<br>
A Classic 250 is the easy route that lets you solve a major problem
with a simple and sensible component upgrade. It'll cost the
customer nearly as much for a winter return trip to estimate Voc.<br>
But I agree with Jay and Randy: first check the existing array for
failures.<br>
Allan<br>
<br>
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<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span style="mso-bidi-font-weight:bold">Positive
Energy,
Inc.</span><br>
<b>505 780-2738 cell</b><br
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<div class="moz-cite-prefix">On 5/31/2015 11:22 PM, Luke Christy
wrote:<br>
</div>
<blockquote
cite="mid:0D5EF23C-D1A6-49B9-8EC7-F92FFACB11D2@gmail.com"
type="cite">
<pre wrap="">Allen,
With 8 modules in series I think I'll be looking at a Classic 250 for sure to be comfortable with winter morning VOC.
I don't really know what kind of combiner situation I'll find up in the attic. It may be easy enough to re-wire into strings of 6 instead of strings of 8, though that is still probably going to push me just over the 150 VOC hard limit of the MX-60. I may not be able to get around replacing the controller.
-Luke
On May 31, 2015, at 10:59 PM, Allan Sindelar <a class="moz-txt-link-rfc2396E" href="mailto:allan@sindelarsolar.com"><allan@sindelarsolar.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Jay,
Whoa, I'd be careful there. Unless there's been a change while I was away on my bicycle, Outbacks are still 140V rated maximum voltage and 150V hard maximum. 142Voc in May suggests that doubling strings in series will easily exceed max Voc in winter. That's why I previously suggested Classic 200 or 250. Am I missing something?
Allan
Allan Sindelar
<a class="moz-txt-link-abbreviated" href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
505 780-2738 cell
On 5/31/2015 2:23 PM, jay peltz wrote:
</pre>
<blockquote type="cite">
<pre wrap="">HI Luke,
To add here. I'm unclear if you have measured each string or the whole array at 71v.
I would check each string for voc/isc.
And then if they are consistent, I agree that putting 2 strings in series with a new controller might help out.
You can try it with the MX-60 as you are at only 142v. If it works better then a new higher voltage CC would be required for winter higher voc.
Let us know what you find out.
jay
</pre>
</blockquote>
</blockquote>
<pre wrap="">
Luke Christy
NABCEP Certified PV Installation Professional™: Certification #031409-25
NABCEP Certified Solar Heating Installer™: Certification #ST032611-03
CoSEIA Certified PV Installer
Solar Gain Services, LLC
PO Box 531
Monte Vista, CO. 81144
<a class="moz-txt-link-abbreviated" href="mailto:SGSRenewables@Gmail.com">SGSRenewables@Gmail.com</a>
719.588.3044
<a class="moz-txt-link-abbreviated" href="http://www.sgsrenewables.com">www.sgsrenewables.com</a>
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