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 <davecl...@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.david...@sbcglobal.net> > To: RE-wrenches <re-wrenches@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:ge...@third-sun.com> > > *To:* RE-wrenches <mailto:re-wrenches@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" <davecl...@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 <ke...@whidbeysunwind.com> > > > To: RE Wrenches listserve <re-wrenches@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 > > > > sunw...@whidbeysunwind.com > > > > > > > > On 8/19/09 2:41 PM, "Dave Click" <davecl...@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? > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > List sponsored by Home Power magazine > > > > > > > > List Address: RE-wrenches@lists.re-wrenches.org > > > > > > > > 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: RE-wrenches@lists.re-wrenches.org > > > > > > 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: RE-wrenches@lists.re-wrenches.org > > > > 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: RE-wrenches@lists.re-wrenches.org > > > > 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: RE-wrenches@lists.re-wrenches.org > > 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: RE-wrenches@lists.re-wrenches.org 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