Take a look at Citel lightning protection. They install on a din rail. We are installing a 15 kw array for Acadia National Park and they were spec'd for the project. It will be our first time using them but they look promising.
http://www.citelprotection.com/ac_surge.htm Daryl > "I've also wondered if we should be fusing these things. One hand says > definitely yes, on the other hand, a big lightning strike would trip the > fuse, before the Delta could do its job." > > > > > > I think a big lightning strike would jump the fuse like it wasn't there. > So > the fuse would really make no difference at all. > > Midnite has an arrestor coming that looks like it has some good > possibilities and a UL listing! It also has a light system to show if it > has > been activated. > > > > I also have seen lightning damage and the delta seemed unharmed each time. > > We need to keep in mind that there is some luck involved; NOTHING is going > to stop a lightning bolt that just traveled 10 or 20 miles across the sky, > so it jumping a meter socket or fuse / breaker would not be hard to > understand. > > > > Later, > > Bob > > > > > > > > > > > > From: [email protected] > [mailto:[email protected]] On Behalf Of R Ray > Walters > Sent: Thursday, September 02, 2010 3:42 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] Delta LA's > > > > I know, as Bill pointed out, that the Deltas are supposed to be mounted on > the exterior to allow the damage to stay outside of the combiner box. But > I've also seen a lot of old Deltas damaged by the sun, and seen them > cracked > off at the 1/2" nipple attachment point, which then leaves exposed THHN > conductors against the edge of the knock out. Just bumping one with your > foot or shoulder could crack the plastic. > > > > We just finished a project with BOS combiners, and I mounted the Deltas to > the backing plate inside using a 2" PVC conduit clamp. In this case, the > AHJs were very concerned with sealing all KOs on the sides of jboxes, so > we > would have had to mount the Deltas on Myer's Hubs. Clunky, and we didn't > have 1/2" hubs. > > If conditions allow, I do prefer to hang them off the bottom of a box, as > long as they're protected from physical abuse. Side mounting is definitely > asking for trouble in many situations, they're just too easy to snap off. > > I've also wondered if we should be fusing these things. One hand says > definitely yes, on the other hand, a big lightning strike would trip the > fuse, before the Delta could do its job. > > BTW, with over 200 projects in lightning territory, I've never actually > had > a Delta blow itself while protecting the system. Plenty of lighting > damage, > though, with the Delta still just sitting there. > > Anyone using the DIN rail mountable equipment from Citadel? > > > > R. Walters > > [email protected] > > Solar Engineer > > > > > > > > > > On Sep 1, 2010, at 6:32 PM, Dave Palumbo wrote: > > > > I am concerned with Delta LA 600VDC cans being mounted exterior from > J-boxes > (or disconnect switches) on ground mounts. > > I remember hearing from an old hand that these devices can fail in a > manner > that could possibly expose the wiring to human hands. The wires would have > high voltage DC potential. Not something we need in our industry. > > > > Am I worrying about something that can't happen? Or should these be in PVC > boxes? > > > > David Palumbo > > Independent Power LLC > > Offices in Lamoille and the Champlain Valley, Vermont > > 802.888.7194 > > www.independentpowerllc.com <http://www.independentpowerllc.com/> > > NABCEP Certified Solar PV InstallerT > > Vermont RE Incentive Program Partner > > > > > > > > > > From: [email protected] > [mailto:[email protected]] On Behalf Of North > Texas > Renewable Energy Inc > Sent: Tuesday, August 31, 2010 10:07 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] Testing LSAs > > > > For the first time since 2004 we got a residential PV red tag for > non-listed > surge supressors. I just took them off and replaced them after we got the > green tag. Of course he also red-tagged the copper ground plate because it > was not thick enough. Go figure.... > > > > Jim Duncan > > North Texas Renewable Energy > > > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]]on Behalf Of Andrew > Truitt > Sent: Tuesday, August 31, 2010 8:09 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] Testing LSAs > > > > Question: Since the Delta lightning arrestors are not UL Listed, do they > threaten the UL compliance of the PV system as a whole? > > > - Andrew Truitt > Currently of Standard Solar > Free agent in the Denver area as of 10/6/10 > > > > > On Tue, Aug 24, 2010 at 6:02 PM, Peter Parrish > <[email protected]> wrote: > > I would think that an ohmmeter set to the 10 Mega-ohm setting (or the > highest setting possible), would be the first test. I would like to see > something on the order of 750 k-ohms (3/4 of a mega-ohm). > > But the system should be tested at a higher voltage, than that available > from a DMM. Apply 240 Vac and measure the RMS current. It should be should > be 0.3 mA or less. > > Finally, these puppies really need to be tested at much higher voltages, > perhaps someone knows how to use that megohmmeter to test? What does the > manu recommend, "if suspect, throw it away and buy a new one"? > > - Peter > > Peter T. Parrish, Ph.D., President > California Solar Engineering, Inc. > 820 Cynthia Ave., Los Angeles, CA 90065 > CA Lic. 854779, NABCEP Cert. 031806-26 > [email protected] > Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 > > > ________________________________________ > From: [email protected] > [mailto:[email protected]] On Behalf Of Kristopher > Schmid > Sent: Tuesday, August 24, 2010 1:30 PM > To: 'RE-wrenches' > Subject: [RE-wrenches] Testing LSAs > > > What is the best method for testing the integrity of a DC and/or AC > lightning surge arrestor? Specifically, i use the Delta LA units. I know > they should be replaced if they look Bar-B-Qued, but otherwise...? > > Thanks, > Kris Schmid > > Legacy Solar > 864 Clam Falls Trail > Frederic, WI 54837 > 715-653-4295 > [email protected] > www.legacysolar.com <http://www.legacysolar.com/> > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org <http://www.members.re-wrenches.org/> > > > > > -- > "Don't get me wrong: I love nuclear energy! It's just that I prefer fusion > to fission. And it just so happens that there's an enormous fusion reactor > safely banked a few million miles from us. It delivers more than we could > ever use in just about 8 minutes. And it's wireless!" > > ~William McDonough > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org <http://www.members.re-wrenches.org/> > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
