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The SPD will (or, should), "clamp" the input voltages, both
positive and negative to ground at the<br>
MOV voltage rating during a lightning strike. The SPD 300 starts
at about 500 volts on each leg<br>
of the SPD. The 600 SPD is higher voltage of course. Since, on
the PV input side, the MOVs <br>
appear to be in series, an SPD 300 should clamp the plus and minus
input to twice 500V or,<br>
about 100 volts which should not do anything to a charge
controller operating up to 250<br>
volts or even higher so I am not sire what happened here. We'll
have to try to do an autopsy<br>
on the controller if possible on this one.<br>
<br>
We're still looking into the optimizer interaction issue. It
doesn't really make any sense as<br>
to why they should "fight" though. We have talked with Tigo on
this but nothing definitive<br>
yet as to why.<br>
<br>
Thanks and happy 4th of July,<br>
boB<br>
<br>
<br>
<br>
On 7/4/2014 7:51 AM, <a class="moz-txt-link-abbreviated" href="mailto:dan@foxfire-energy.com">dan@foxfire-energy.com</a> wrote:<br>
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cite="mid:20140704075127.720a661d8db719b1f2ad39509c9edaa3.fed710918e.wbe@email14.secureserver.net"
type="cite"><span style="font-family:Verdana; color:#000000;
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<div>Anyone else having problems with Midnight Classics Flaming
out (Literally)? We know they don't play nice with Tigo
Optimizers. Wondering if a Midnight SPD might also look like a
short to a classic when it clamps. only affected two of the
four controllers. Two seemed to be un affected, one tripped
off and reset, Not only did the last one let the smoke out,
but went Dali in the process. Painted up the wall and
everything.Suggestions? Thanks db<br>
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<div><br>
Dan Brown<br>
Foxfire Energy Corp.<br>
Renewable Energy Systems<br>
(802)-483-2564<br>
<a moz-do-not-send="true" href="http://www.Foxfire-Energy.com">www.Foxfire-Energy.com</a><br>
NABCEP #092907-44</div>
<div><img id="sigimg0" title="signature image"
src="cid:part2.03070901.09060903@midnitesolar.com" alt=""
border="0"></div>
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-------- Original Message --------<br>
Subject: Re: [RE-wrenches] 2014 NEC<br>
From: Phil Forest <<a moz-do-not-send="true"
href="mailto:pforest@southmountain.com">pforest@southmountain.com</a>><br>
Date: Tue, May 20, 2014 1:25 pm<br>
To: RE-wrenches <<a moz-do-not-send="true"
href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
<br>
<div>Will,</div>
<div>No problems with inspectors for us in MA, regarding
rapid shutdown, since we recently switched to using
SolarEdge central inverters with optimizer under each
module, for roof mounted installs. </div>
<div>So far so good. They seem well made and engineered.
Tip: you have to enable the arc fault protection when
commissioning, ships disabled. <br>
<br>
<div>Phil Forest</div>
<div>South Mountain Company</div>
</div>
<div><br>
On May 20, 2014, at 10:59 AM, Will White <<a
moz-do-not-send="true" target="_blank"
href="mailto:William.White@rgsenergy.com">William.White@rgsenergy.com</a>>
wrote:<br>
<br>
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<div class="MsoNormal" style="font-size:12pt;">Wrenches,<o:p></o:p></div>
<div class="MsoNormal" style="font-size:12pt;"><o:p> </o:p></div>
<div class="MsoNormal" style="font-size:12pt;">Is
anyone else having problems with inspectors and the
2014 NEC? In Mass we’re having all kinds of issues
with inspectors requiring/allowing an array of
different things for 690.12 rapid shut down ranging
from roof top disconnects, disconnects on the side
of a house 20’ up, disconnects in attics, or only
disconnects that can be activated on the ground. It
varies between inspectors.<o:p></o:p></div>
<div class="MsoNormal" style="font-size:12pt;"><o:p> </o:p></div>
<div class="MsoNormal" style="font-size:12pt;">We’re
also having problems with one inspector requiring
arc fault breakers on Enphase even though there are
no UL listed arc fault breakers that can be back fed
or he wants us to run the trunk cable in a raceway.
<o:p></o:p></div>
<div class="MsoNormal" style="font-size:12pt;"><o:p> </o:p></div>
<div class="MsoNormal" style="font-size:12pt;">It’s
getting very difficult to install in Mass.<o:p></o:p></div>
<div class="MsoNormal" style="font-size:12pt;"><o:p> </o:p></div>
<div class="MsoNormal" style="font-size:12pt;">Thanks,<o:p></o:p></div>
<div class="MsoNormal" style="font-size:12pt;">Will<o:p></o:p></div>
<div class="MsoNormal" style="font-size:12pt;"><o:p> </o:p></div>
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</span><span
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