600 vdc arc testing [RE-wrenches]

[jay peltz]

Hi Bill,

My goof, thanks for catching it,

jay

Bill Brooks wrote:

> Jay,
>
> With all do respect to my friends at Outback, the 48V string/600
> v combiner only deals with the issue of what to do with a SunTie Array when
> you want to put a Sunny Boy on the same array. 600V still exists on the roof
> and anywhere you open the circuit under load (it's a circuit remember).
>
> Bill.
>
> -----Original Message-----
> From: jay peltz [mailto:jay at asis.com]
> Sent: Tuesday, January 22, 2002 9:30 PM
> To: RE-wrenches at topica.com
> Subject: Re: 600 vdc arc testing [RE-wrenches]
>
> 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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