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<br>
In addition, an SPD is supposed to keep any input lines to the
equipment from breaking over<br>
the insulation. For the Classic, the hipot voltage is over 2000
volts to chassis (gnd).<br>
<br>
If the SPDs are grounded and connected well they should be able to
do their job unless maybe<br>
it is a direct strike and then it is not so easy to visualize.<br>
<br>
Anyway, this is why SPD voltages are normally higher than the
usual maximum system<br>
operating voltages. But a good ground is essential. Even a
seemingly far off lightning<br>
strike can cause high electric fields near an antenna or PV array
or tower system but.<br>
<br>
boB<br>
<br>
<br>
<br>
On 7/4/2014 11:20 AM, <a class="moz-txt-link-abbreviated" href="mailto:boB@midnitesolar.com">boB@midnitesolar.com</a> wrote:<br>
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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 moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:dan@foxfire-energy.com">dan@foxfire-energy.com</a>
wrote:<br>
</div>
<blockquote
cite="mid:20140704075127.720a661d8db719b1f2ad39509c9edaa3.fed710918e.wbe@email14.secureserver.net"
type="cite"><span style="font-family:Verdana; color:#000000;
font-size:10pt;">
<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>
</div>
<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>
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src="cid:part3.07000304.05080506@midnitesolar.com" alt=""
border="0"></div>
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<div id="wmQuoteWrapper"> -------- 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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