[RE-wrenches] ballasted roof rack - on the ground?
Geoff Greenfield
geoff at third-sun.com
Sun Aug 23 08:43:31 PDT 2009
Thanks all.., good intel- I will be checking with the various Manus to see what they say. I suspect "flatness" is a big question.
For a brighter energy future,
Geoff Greenfield
President
Third Sun Solar & Wind Power Ltd.
340 West State Street, Unit 25
Athens, OH 45701
740.597.3111 Fax 740.597.1548
www.Third-Sun.com
Clean Energy - Expertly Installed
----- Dave Click <daveclick at fsec.ucf.edu> wrote:
> I think that the 250kW Florida Power & Light array in Sarasota, FL was
> installed on a ground cover (over a landfill) like the SIT solution, and
> that it was just done with PowerGuard.
>
> -------- Original Message --------
> Subject: Re: [RE-wrenches] ballasted roof rack - on the ground?
> From: Joel Davidson <joel.davidson at sbcglobal.net>
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Date: 2009/8/21 10:14
>
> > Geoff,
> >
> > Solar Integrated Technologies adheres its panels on ground covers
> > over landfills to capture landfill gases and separately produce PV
> > electricity. Perhaps a wrench with Powerlight experience can tell us why
> > rigid modules are not laid on a ground cover.
> >
> > Joel Davidson
> >
> > ----- Original Message -----
> > *From:* Geoff Greenfield <mailto:geoff at third-sun.com>
> > *To:* RE-wrenches <mailto:re-wrenches at lists.re-wrenches.org>
> > *Sent:* Thursday, August 20, 2009 8:35 PM
> > *Subject:* [RE-wrenches] ballasted roof rack - on the ground?
> >
> > esteemed wrenches (or just steamed if youve been out in the hot lately)
> >
> > I'm curious why more folks don't use the same flat roof ballasted
> > rack approach for large ground mounts? Geotech weed barier and off
> > we go... my initial calcs sat its a cost saver... my instinct says
> > it viable, but my other instinct says "if it were this easy I would
> > see it all the time (and I've never seen it)
> >
> > what's up? frost heave/instability? wav-i-ness of the ground?
> > better performance at steep angle worth all the extra cost (not
> > according to my pencil with today's mod costs). Thoughts?
> >
> > For a brighter energy future,
> >
> > Geoff Greenfield
> > President
> > Third Sun Solar & Wind Power Ltd.
> > 340 West State Street, Unit 25
> > Athens, OH 45701
> >
> > 740.597.3111 Fax 740.597.1548
> > www.Third-Sun.com
> >
> > Clean Energy - Expertly Installed
> >
> >
> >
> >
> >
> >
> > ----- "Dave Click" <daveclick at fsec.ucf.edu> wrote:
> > > Thanks all.
> > >
> > > It was my understanding that we should still be running the
> > conductors
> > > of the same circuit through the same raceway, even if it is the
> > DC input
> > > into the inverter since that DC oscillates slightly (nowhere near as
> > > much as AC). I wasn't concerned about eddy currents in the FNMC of
> > > course but the metal box itself, a concern being voiced on this list
> > > before. I'd be more concerned about this if it were a 1MW inverter
> > > rather than a 7kW, but still.
> > >
> > > Thanks for the info on the GEC tap and I'm glad the split bolts
> > work here.
> > >
> > > The conduit in question doesn't seem to be there just for physical
> > > protection; the wire runs from the east end of the array for
> > 100'+ and
> > > only the last 3' are in conduit. If it were only for protection
> > I'd be
> > > fine with it being open-ended on both ends, but since it's there
> > to feed
> > > the conductors into the box, that's why I was treating it as a
> > regular
> > > conduit that required a cord grip at the other end. Where do
> > others make
> > > the distinction?
> > >
> > > Thanks,
> > > DKC
> > >
> > > -------- Original Message --------
> > > Subject: Re: [RE-wrenches] DC positive and negative in same conduit,
> > > other inspection issues
> > > From: Kelly Keilwitz, Whidbey Sun & Wind <kelly at whidbeysunwind.com>
> > > To: RE Wrenches listserve <re-wrenches at lists.re-wrenches.org>
> > > Date: 2009/8/19 21:10
> > >
> > > > Dave,
> > > > Only GEC's are subject to the "continuous" rule (250.64C). It
> > sounds like
> > > > your are talking about an EGC tapped from the GEC.
> > > >
> > > > When splicing PV GEC's required under 690.47D, either together
> > (from
> > > > separated arrays) or to the existing AC GEC (if close enough),
> > we have been
> > > > allowed to use split bolts instead of irreversible splices, per
> > 250.64D1,
> > > > "Grounding Electrode Conductor Taps" (at end of paragraph).
> > I.E., the
> > > > "continuous" rule is only being applied to the main GEC.
> > > >
> > > > I agree with Kurt on the LTNMF being used only as extra (not
> > required) wire
> > > > protection for the USE-2. We often do this when running PV
> > conductors
> > > > between short separations in modules or rails. I would think
> > that only
> > > > temperature and fill corrections would apply - and only if the
> > length
> > > > requires.
> > > >
> > > > -Kelly
> > > >
> > > > Kelly Keilwitz, P.E.
> > > > Whidbey Sun & Wind, LLC
> > > > Renewable Energy Systems
> > > > NABCEP Certified PV Installer
> > > > 987 Wanamaker Rd,
> > > > Coupeville, WA 98239
> > > > PH & FAX 360-678-7131
> > > > sunwind at whidbeysunwind.com
> > > >
> > > > On 8/19/09 2:41 PM, "Dave Click" <daveclick at fsec.ucf.edu> wrote:
> > > >
> > > >> For the grounding electrode wiring, it seems that it's fine to
> > me since
> > > >> they ran the continuous #6 to each rail and then to the rod,
> > qualifying
> > > >> as the 690.47(D) supplemental electrode. But the split bolts
> > tapping
> > > >> that GEC to "ground the disconnect," these are required to be
> > > >> irreversible connections to the ground bus in that disconnect,
> > right?
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
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