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.
At 07:46 PM 9/18/2012, you wrote:
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_00CC_01CD95D6.8DC9B940"
Content-Language: en-us
If you cut them during the day, under sunlight
conditions it can do bad things to the wire cutters.
Been there before,
Bob Ellison
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of john
Sent: Tuesday, September 18, 2012 1:43 PM
To: re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] wrenches] Short Circuit Cell Damage
Mark,
As far as cutting the jumper for us
nightowls, it is easy. Wait until dark. The
sun actually turns off every day!.
And for the new people on the block, polarity
can still be determined after dark. All you
need is a microvolt to get polarity.
John
CV Solar
-----Original Message-----
From: benn kilburn <<mailto:b...@daystarsolar.ca>b...@daystarsolar.ca>
To: RE-wrenches
<<mailto:re-wrenches@lists.re-wrenches.org>re-wrenches@lists.re-wrenches.org>
Sent: Tue, Sep 18, 2012 1:48 am
Subject: Re: [RE-wrenches] Short Circuit Cell Damage
Mark,
Shorting the string should not be an issue.
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 beforehandÂ… I think I remember reading that somewhere?!?!
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.
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.
Cheers,
benn
DayStar Renewable Energy Inc.
<http://www.daystarsolar.ca/>www.daystarsolar.ca * Ph: 780-906-7807
Construction Electrician Solar Photovoltaic Systems Certified
Certificate # 0007S
HAVE A SUNNY DAY
On 17/09/12 9:50 PM, "Mark Frye"
<<mailto:ma...@berkeleysolar.com>ma...@berkeleysolar.com> wrote:
Wrenches,
True or False: In a nominal sort of grid tied situation with string Voc
at about 300 VDC and Isc at about 6 or 7 amps......It is OK to install
modules on a roof in the sun and short the pos and neg together
indefinitely.
In other words modules can handle operating at Isc continuously without
damage. It is only if you get localized shading AND a failed bypass
diode that damaging hot spot heating can lead to failure?
I am reviewing an installation manual that recommends completing the
home run by connecting the pos and neg of the string with a single
jumper cable, folding the cable on itself in order to push it through to
a j-box and at some point later on, cutting the jumper in the j-box to
terminate the pos and negs to the home run.
I am concerned both about maintaining the string in a short circuit
condition and cutting the jumper while energized.
Any thoughts?
Mark Frye
Berkeley Solar Electric Systems
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