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Mike,<br>
Jay's suggestion to turn off string three, the low one, is good.
Plus I can guide the homeowner by phone, thus avoiding the cost of
another site visit, so that adds appeal. <br>
<br>
I just spoke with him. While he lacks the DMM and DC amp clamp, he
is going to record V and I in and out for each string, using the
MX60 display as his data source. I'll post any noteworthy results
here. We're in monsoon season (afternoon cloud buildup and
thunderstorms) so it may not be for a few days.<br>
<br>
Re Jerry's comments: I think that you mean an I/V curve tracer test,
rather than Solmetric, right? That's not a tool I have or will get
for my current work, but it's a good idea, thanks. The client and I
are pretty much in agreement that we're dealing with serious
browning - indeed, more than I have ever seen with BP 75W modules of
this vintage (my own home's 18 BP590 modules of similar age show
very little browning and about 15% degradation, rather than 50%) and
aren't worth the cost of a whole bunch of testing. Mostly, we're
looking for any specific and correctable cause, as we have one spare
matching module in storage, and I also simply posted to seek answers
as to why the Vmp was so low.<br>
<br>
Jerry, it was selling, so the voltage would be held around the sell
level of 26.4V. The inverter is set to the default sell AC amps, 35A
as I recall and the MX60 is defaulted to 60A output, so they aren't
causing any restrictions. The batteries are known to be used up -
indeed, we want to better understand the array issue in order to
help determine whether to replace the SunXtender AGMs for backup
power or just leave the system in a state of benign neglect. The
client is considering our suggestion to install a separate grid-tied
batteryless system once he has lived in the home for a year or so to
determine consumption. This legacy system would pretty much just be
backup, as with hardware that old a new array as well as batteries
is hard to justify.<br>
<br>
Thank you to all. More to come later if we learn anything worth
sharing.<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
style="mso-special-character:line-break">
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<div class="moz-cite-prefix">On 8/26/2016 10:14 AM, Mike Kocsmiersky
wrote:<br>
</div>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Your
measurements of the Isc for the four stings seems to be odd
in string 3 with only 2.4A. However, when you measure the
circuit under load, you are getting 14.6A from all 4
strings, which averages 3.65A. I’d say check that string
again, perhaps the current clamp wasn’t zeroed or something.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">First
I would try reading the MPPT voltage and current for each
string individually connected to the load. If one of the
strings had a bad diode, I’m not sure it would show up in a
Voc test. Perhaps a bad bypass diode could give the MPPT
algorithm a difficult time finding the MPPT of the array,
and it gets stuck on curve of the one string that has a bad
diode.<o:p></o:p></span></p>
<p class="MsoNormal"><span
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Also,
it could be more of an issue with the MPPT controller
thinking the array is a 24V Array, or some other controller
failure. I would look there.<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">Mike
Kocsmiersky<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Principal<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Phone:
413 883-3144 <o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:16.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Spirit
Solar<o:p></o:p></span></b></p>
<br>
</div>
</div>
</blockquote>
Can you do a solmetric type test, when you performed the amp test
the volts were at near "0" so the test does not show an accurate
value, you said the modules are brown this is not good but are they
checked because if so you are done needs new modules. I would
suggest doing some additional testing, is it selling, and at what
amount, whats going into or out of the batteries at that time, what
inverter is it, trace 24 I would assume, if it is selling is the
inverter capable of selling more than it is or is at the limit, I
need more numbers to get a better understanding if there is even a
problem. You can adjust "Sell" down to perform a test and see if the
DC climbs, also you can set the MX amp down too. <br>
Jerry
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