<p dir="ltr">We use the solmetric 600 and the 1000 and save the data. It the testing you are doing do you see and modules that stand out as bigger effenders<br>
Jerry </p>
<div class="gmail_quote">On Oct 5, 2015 2:35 AM, "Bill Loesch" <<a href="mailto:solar1online@charter.net">solar1online@charter.net</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Fellow RE-Wrenches,<br>
<br>
What offerings exist for curve tracers like Glen refers to? Comments
on specific models?<br>
<br>
Thanks,<br>
<pre cols="72">--
Bill Loesch
Solar 1 - Saint Louis Solar
<a href="tel:314%20631%201094" value="+13146311094" target="_blank">314 631 1094</a></pre>
<br>
<br>
<div>On 10/4/2015 9:52 PM, Glenn Burt wrote:<br>
</div>
<blockquote type="cite">
<div>
<div style="font-family:Calibri,sans-serif;font-size:11pt">Why
wouldn't you invest in an I-V curve tester like the Solmetric
PVA series and let it do the heavy lifting of the testing you
are looking for?<br>
Or am I missing something in what you are looking for?<br>
<br>
Sincerely,<br>
Glenn Burt<br>
Sent from my 'smart' phone so please excuse grammar and typos.</div>
</div>
<div dir="ltr">
<hr><span style="font-family:Calibri,sans-serif;font-size:11pt;font-weight:bold">From: </span><span style="font-family:Calibri,sans-serif;font-size:11pt"><a href="mailto:frenergy@psln.com" target="_blank">frenergy</a></span><br>
<span style="font-family:Calibri,sans-serif;font-size:11pt;font-weight:bold">Sent: </span><span style="font-family:Calibri,sans-serif;font-size:11pt">10/4/2015 21:56</span><br>
<span style="font-family:Calibri,sans-serif;font-size:11pt;font-weight:bold">To: </span><span style="font-family:Calibri,sans-serif;font-size:11pt"><a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches</a></span><br>
<span style="font-family:Calibri,sans-serif;font-size:11pt;font-weight:bold">Subject: </span><span style="font-family:Calibri,sans-serif;font-size:11pt">[RE-wrenches] PV testing</span><br>
<br>
</div>
Wrenches,<br>
<br>
As time passeth, we're bumping more into older PVs/arrays
that have <br>
questionable outputs. After minimizing the variables (dust,
temps, sun <br>
angle, wiring, expected deterioration with age, etc) and still
coming up <br>
with low numbers. Testing individual PVs' Voc and Isc don't seem
to tell <br>
the whole story as they often look good.<br>
<br>
Would not a definitive test be to wire a suspect PV to an
<br>
inexpensive mppt CC (oxymoron?) and then to an orphaned battery.
The <br>
battery would have to have a mondo (surplus) rheostat paralleled
to it to <br>
maintain a steady voltage during the test. With appropriate
metering in <br>
place, you would then have Vmmp and Immp as the rheostat is
tweaked to hold <br>
a steady batt voltage and the CC finds the knee.<br>
<br>
Help me here. I know its a little spendy to cobble up but
the value <br>
of nailing an offender might be worth it. Am I missing
something? Is it <br>
common for inverters to fall off in output gradually?<br>
<br>
Bill<br>
Feather River Solar Electric </blockquote>
<br>
<pre cols="72">
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