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<p>The Midnite SOB system is up and running. We have one installed
that has been working trouble free for about 8 months.<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 4/27/19 12:07 PM, Mick Abraham
wrote:<br>
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cite="mid:CABOJ=XTLPBNQfUbm-f=rv4F=b8P6UXeURSBQpwdi-sO5xhVSLg@mail.gmail.com">
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<div dir="ltr">Scot Arey wrote:
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">"How did
\u201cmodule-level\u201d shutdown get taken as gospel truth??</blockquote>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
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rgb(204,204,204);padding-left:1ex">I\u2019m thinking a
Fronius Primo with its RSD Quattro device mounted on an
array rail meets current 2017 code."</blockquote>
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<p class="MsoNormal">Mick here: The issue is that if a
Fronius type PV "string" is interrupted at the edge of the
array, one still has open circuit voltage on the string
that's much higher than the 80 volt limit. The MLPE
"module level power electronics"--whether they're
microinverters or DC optimizers--snub any sum of AC or DC
voltage below 80 when they're in shutdown mode. Both of
those solutions also optimize to the level of individual
PV modules & they provide granular metering of the
energy deliveries--but I assume those benefits are of
little value to the project you're planning, Scot.</p>
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<p class="MsoNormal">I don't know the availability status
for Midnite's SOB "Shut Off Box", but this segments the PV
string during shutdown & it gets the voltage below 80
without the expense of optimization & granular
monitoring. There are still "electronics" behind each PV
module because these shutoffs are triggered by radio but
it's not MLPE in the usual sense & the cost is
relatively low since all they're doing is opening
contactors. I hope this reply is helpful. </p>
<p class="MsoNormal"><br>
</p>
<p class="MsoNormal">The Wrench List is The Bomb!</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Mick Abraham, Proprietor<br>
</p>
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