lightning arrestors [RE-wrenches]

[David Blittersdorf]

A heads up on the LA lightning arrestors. If you take one apart, all they 
are is a can of beach sand with spaced electrodes. They call them 
"silicon" because of the sand. There is a big question in my mind if they 
really work. I know varistors work but these things to me are sand-filled 
spark gaps.

Regards,

David Blittersdorf

On 7 Mar 2003 at 9:29, Nick Nicholas, APS wrote:

> Brad and wrenches:
>     If I remember correctly, the Sunroof Systems from SAPC first utilized
> the LA-302-DC, which is rated for 0-250 VDC, but more recently utilized the
> LA-302-R, which is installed on the AC side.  I never understood why the Sunny
> Boy systems would not use the LA-602-DC, which is rated for 0-600 VDC.  If we
> are installing these lightning arrestors to provide peace of mind, would it be
> more appropriate to call them lightning faeries?  If a non-UL listed lightning
> fairy is less valuable than none at all, why would we consider any lightning
> protection? I am partially
>     Also, my nicest systems utilize the Polyphaser 50A- Negative Ground
> lightning fairy.  I was told that some voltage drop occurs while passing
> across lightning arrestors that are placed in-line of the DC circuits.  Is
> this loss significant?  Should it be designed for?  I will be commissioning a
> system with four polyphasers later this month.  The 6.6 kW arrays will be
> installed as part of an SEI workshop next week.  All right, free labor!
> Alternative Power Systems www.alternativepowersystems.com aps at sbcglobal.net 135
> Colfax Ave. Grass Valley, CA 95945 (530) 274-0588 phone (530) 274-0589 fax -----
> Original Message ----- From: "Brad Bassett" <bsbassett at earthlink.net> To:
> <RE-wrenches at topica.com> Sent: Thursday, March 06, 2003 7:58 PM Subject: RE:
> lightning arrestors [RE-wrenches]
> 
> 
> > Bill and all,
> >
> > The lightning arrestors previously used in the Schott Combiners are no
> > longer UL listed and so are no longer installed in the combiners.
> >
> > Brad
> >
> > Bill Brooks wrote:
> > I believe Schott
> > > Applied Power has listed a high voltage arrestors in their string
> > > combiner-not positive.
> > >
> >
> > Brad Bassett
> > Schott Applied Power
> > Tumwater, WA office
> > bsbassett at earthlink.net
> >
> > - - - -
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David Blittersdorf
NRG Systems, Inc.
110 Commerce Street
Hinesburg, VT 05461 USA
Tel: 802-482-2255
Fax: 802-482-2272
email: davidb at nrgsystems.com
Web:http://www.nrgsystems.com

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