600 vdc arc testing [RE-wrenches]

[jay peltz]

Hi All,

I suggest that if the hi voltage is a problem, then the new 48v string/600v
combiner from Outback is the ticket.  This allows you to use 48v nominal
strings, then combine at a convient location to 500-600v.  Keeps hi voltage
off the roof.  and makes good sense to me.

Also in regards to quick connections, the multi contact plugs  ( I have no
idea why they are called multicontact as it is only a single conductor) are
UL listed, and sure make it easy to install flush mounted panels.  All I do
is pre wire the pigtales, mount the panel and then reach under and connect
the plugs.  ( the wire is USE-2, which around here we don't seem to have
much problem with rodents.)

As to the color, just get me a spray can or touch up bottle so I can fix
those scratches.  Also just make the color of the inverter match the boxes
you sell, that is the outback boys!!

later,

jay

peltz power

graham at solarexpert.com wrote:

> Hi Christopher,
>
> Thanks for taking the time to test the arc length of 600 Volts DC as
> well as making it available on your web site.  The potential for arcing
> on my customers residential roof tops scares me.  There are quite a few
> 600 volt systems being installed in southern California at this time,
> and almost all of these installations are using quick-connects between
> the modules.  I have even heard of an individual installer that pulls
> apart a quick connect to pull an arc to light his cigarette. 600 volts
> systems with quick-connects are fast an easy to install but are they
> truly safe for residential applications?
>
> I have had problems at my house with squirrels gnawing on telephone,
> cable TV as well as power lines.  Last year a squirrel chewed through
> the line drop across my back yard and burning insulation was dripping
> onto the lawn.  The Burbank Department of Water and Power came out and
> found the dead squirrel and mentioned that this is a common occurrence.
> This has kept me from installing high voltage systems with quick
> connects.
>
> Would it be safer if the USE cable is armored and a clamping devise or
> cover eliminates the chance of the connections pulling apart?
>
> I would really appreciate advice from members of the wrenches list who
> have been working with PV for a much longer time than the guys
> installing systems locally who keep advising me that I am crazy
> panelizing modules with conduit in the shop.
>
> Graham Owen
> GO Solar Company
>
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