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<p>I went back to this array, removed all J-box covers and tested
for Voc. The majority of the PVs were ~ 9.5Voc, about 5 were ~19
Voc, 3 were 0 (that's zero) Voc . The diodes are in an
encapsulant. The label says Voc = 22V. Another array of
Mitsubishi panels takes a dive.</p>
<p> Anybody have contact info for them or recent
experience with their warranty?</p>
<p>Thanks,</p>
<p>Bill</p>
<p>Feather River Solar Electric<br>
Bill Battagin, Owner<br>
4291 Nelson St.(shipping)<br>
5575 Genesee Rd. (USPS, UPS)<br>
Taylorsville, CA 95983<br>
530.284.1925 Office/ 530.258.1641 Cell<br>
CA Lic 874049<br>
Solar powered since 1982</p>
<div class="moz-cite-prefix">On 5/17/2023 10:25 PM, Darryl Thayer
via RE-wrenches wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAHsrUiS4MJpn3qr7xFuZFN0vf-eCJed6VNB4odipUOhdaKhRXQ@mail.gmail.com">
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<div class="gmail_default" style="font-family:times new
roman,serif;font-size:large">Was the inverter connected at the
time of testing? If so I suspect the inverter is loading the
solar array below Vmp</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, May 17, 2023 at
11:23 PM frenergy via RE-wrenches <<a
href="mailto:re-wrenches@lists.re-wrenches.org"
moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Wrenches,<br>
<br>
I've got a call from a customer that said their
(my <br>
install) 17 year old GT system went dead. Basic stats: 23,
Mitsubishi <br>
PVMF120EC3, label says V mpp= 17.6V and Voc = 22 V;
top-of-pole; SMA <br>
SB3800U. Its one string of 23 PVs. Full sun, 75 degrees
ambient during <br>
testing. When I checked DC voltage at the inverter landings I
got ~23-29 <br>
volts (fluctuating) same at the input side of the DC switch.
These <br>
panels have the old gasketted 4-screw covered J-boxes and
screw <br>
terminals inside, I removed the covers from three panels and
got 9.5 <br>
volts at the each of the panels' screw terminals, all the
wiring <br>
outside the boxes checks out.<br>
<br>
The system had been functioning normally 3 weeks
prior. I <br>
could check voltage at more panels I guess. Ideas?<br>
<br>
Bill<br>
<br>
Feather River Solar Electric<br>
Bill Battagin, Owner<br>
4291 Nelson St.(shipping)<br>
5575 Genesee Rd. (USPS, UPS)<br>
Taylorsville, CA 95983<br>
530.284.1925 Office/ 530.258.1641 Cell<br>
CA Lic 874049<br>
Solar powered since 1982<br>
<br>
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