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<p> This is a very timely discussion for us also as we
have many Midnight MNPV6 discos in the sun. Though we're careful
about tightening wire landings, using contact cleaner for the
fuses and fuse holders, some installs seem to get hotter than
others. We just started making a very simple sheet metal heat
shield of sorts spaced away from the face of the disco for
ventilation which keeps direct sun off the "face" of the disco.
We don't paint this shield to give the galvanized surface a chance
to reflect the IR.<br>
</p>
<p> Its a retro which we've covered the cost for to
prevent callbacks for blown (cooked?) fuses. I haven't done any
before and after temp checks but I know from a long history of
this kind of work that temps inside that disco will be
substantially lower. They haven't been out in the field long
enough to get any data.<br>
</p>
<p>Bill</p>
<pre class="moz-signature" cols="72">Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
<a class="moz-txt-link-abbreviated" href="http://www.frenergy.net">www.frenergy.net</a></pre>
<div class="moz-cite-prefix">On 11/18/2020 5:13 PM, Ray wrote:<br>
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<blockquote type="cite"
cite="mid:55ee31be-37ba-5a8e-4f3c-037b06605c9b@solarray.com">
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<p>What is the brand and model of the disconnect? Temp ratings of
the terminals? I've definitely had fuse holders not make good
contact with the fuses and burn the fuses at one end, instead of
in the middle. Have you looked at it with a Thermal imaging
camera when its operating to see if its hot on one end of the
fuse? <br>
</p>
<p>Second, depending on the temperature it would be hitting inside
the enclosure in the sun, you could be exceeding the rating of
the #6 conductor. Assuming terminals rated at 75C, then from
310.16, a #6 is rated 65 A, but derate for temperature of 114F
inside the enclosure gets you to .82 x 65 = 53.3, which is a bit
less than the 54.45 that Dave just calculated for continuous
duty. <br>
</p>
<p>What color is the disconnect painted? any chance of painting
it white?<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 11/18/20 4:16 PM, Dave Tedeyan
wrote:<br>
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cite="mid:CA+cq0bX0SzSssT6jDYkT2pkgNwjjYAyNMw1y__=35CLf-STTmw@mail.gmail.com">
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<div dir="ltr">Jason,
<div>Bright sunny days, disconnect on the west side of house,
maybe in the sun? 43.56A * 1.25 for continuous duty =
54.45A. If these disconnects are also baking in the sun,
maybe the extra ambient heat is enough to push it over the
edge? Just a thought.</div>
<div>Cheers,</div>
<div>Dave<br clear="all">
<div>
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<div><b><font face="tahoma,
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