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If you cut them one at a time, it won't hurt the cutters, but you can get
a good shock. Cutting is not that difficult, but the stripping can be a
bit dicey. <br><br>
<br>
At 07:46 PM 9/18/2012, you wrote:<br>
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<font face="Calibri" size=4 color="#1F497D">If you cut them during the
day, under sunlight conditions it can do bad things to the wire
cutters.<br>
<br>
Been there before,<br>
Bob Ellison<br>
<br>
</font><font face="Tahoma" size=2><b>From:</b>
re-wrenches-bounces@lists.re-wrenches.org
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" eudora="autourl">
mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of
</b>john<br>
<b>Sent:</b> Tuesday, September 18, 2012 1:43 PM<br>
<b>To:</b> re-wrenches@lists.re-wrenches.org<br>
<b>Subject:</b> Re: [RE-wrenches] wrenches] Short Circuit Cell
Damage<br>
</font><font face="Times New Roman, Times"> <br>
</font><font size=2>Mark,<br>
As far as cutting the jumper for us nightowls, it is
easy. Wait until dark. The sun actually turns off every
day!.<br>
And for the new people on the block, polarity can still be determined
after dark. All you need is a microvolt to get polarity. <br><br>
John<br>
CV Solar<br>
-----Original Message-----<br>
From: benn kilburn
<<a href="mailto:benn@daystarsolar.ca">benn@daystarsolar.ca</a>><br>
To: RE-wrenches
<<a href="mailto:re-wrenches@lists.re-wrenches.org">
re-wrenches@lists.re-wrenches.org</a>><br>
Sent: Tue, Sep 18, 2012 1:48 am<br>
Subject: Re: [RE-wrenches] Short Circuit Cell Damage<br>
</font><font size=2 color="#00007F">Mark,<br>
Shorting the string should not be an issue. <br>
Unless you work at night, obviously there will be an arc when you cut the
jumper, so remember to cover the whole string with an opaque covering
beforehand… I think I remember reading that somewhere?!?! <br>
Or just be careful, try to do it when the irradiance is low (less
current), separate the cut wires quickly and make sure you have left
enough wire in the box so that you are not working with short (and
energized) wires in a metal box. put a wire nut on one wire while you
handle and terminate the other.<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">A safer method, if possible, would be
to leave an easily accessible module interconnection un-connected until
you have terminated the home run (+)&(-), then go back and make the
final module interconnection.<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">Cheers,<br>
benn<br>
DayStar Renewable Energy Inc. <br>
<a href="http://www.daystarsolar.ca/">www.daystarsolar.ca</a>
* Ph: 780-906-7807 <br>
Construction Electrician Solar Photovoltaic Systems Certified<br>
Certificate # 0007S<br>
HAVE A SUNNY DAY<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">On 17/09/12 9:50 PM, "Mark
Frye"
<<a href="mailto:markf@berkeleysolar.com">markf@berkeleysolar.com</a>
> wrote:<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">Wrenches,<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">True or False: In a nominal sort of
grid tied situation with string Voc <br>
at about 300 VDC and Isc at about 6 or 7 amps......It is OK to install
<br>
modules on a roof in the sun and short the pos and neg together <br>
indefinitely.<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">In other words modules can handle
operating at Isc continuously without <br>
damage. It is only if you get localized shading AND a failed bypass <br>
diode that damaging hot spot heating can lead to failure?<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">I am reviewing an installation manual
that recommends completing the <br>
home run by connecting the pos and neg of the string with a single <br>
jumper cable, folding the cable on itself in order to push it through to
<br>
a j-box and at some point later on, cutting the jumper in the j-box to
<br>
terminate the pos and negs to the home run.<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">I am concerned both about maintaining
the string in a short circuit <br>
condition and cutting the jumper while energized.<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">Any thoughts?<br>
</font><font size=2> <br>
</font><font size=2 color="#00007F">Mark Frye<br>
Berkeley Solar Electric Systems<br>
</font><font size=2> <br>
</font><font size=2 color="#0000FF"> <br>
</font><br>
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