I can't find the link to Jeff randles new rack company? Can someone help me out
Thx Jay Peltz power. Sent from my iPhone > On Jan 10, 2017, at 8:31 PM, Ray Walters <r...@solarray.com> wrote: > > Hi William; > > Your link had a glitch, I think this should be it? > http://www.millersolar.com/MillerSolar/case_studies/Wind_damage/_wind_damage.html > > We have DP&W's high wind option which bumped the pole size from 4" to 6" > along with heavier hardware throughout. I haven't been to the site yet, but > the techs were reporting just the module failed and the rack is still good. > I'm going up next week and I'll try to figure this out. This site also has a > funnel effect as you mentioned. Higher ridges to the North and South, and > this smaller peak between with our rack almost right at the top. > Roof mounts actually do seem to be much better; the wind doesn't get behind > it, and if the array is set back from the edge, the side edge of the array > isn't getting pummeled. > Our failure occurred with an angled wind, not perpendicular. Your rack > failures look also to have had uneven loading: the way it twisted that top > rail off. I almost wonder if these racks aren't hitting some resonance that's > causing the rack to twist and torque back and forth repeatedly. You can grab > the corner of the array and "pluck" it, then watch it bounce back and forth: > that's the simple way to determine its harmonic resonance. > > R.Ray Walters > CTO, Solarray, Inc > Nabcep Certified PV Installer, > Licensed Master Electrician > Solar Design Engineer > 303 505-8760 > >> On 1/10/2017 6:26 PM, William Miller wrote: >> Ray: >> >> I can't say I have a solution to your problem, but I can share some photos >> of two similar failures in case you can glean any information from them. >> See: >> http://www.millersolar.com/MillerSolar/case_studies/Wind_damage/_wind_dama >> ge.html >> >> The first failure is a Zomeworks. On the same exact spot we tried a DPW >> TOP. Neither could withstand a funnel effect provided by the topography. >> >> At the same location we installed a roof mount as well that has never >> failed (to my knowledge, we don't service that customer anymore). >> >> I think if you have terrain that is tilted in the correct direction a >> mount that hugs the ground is best. That is a lay opinion, however. >> >> William >> >> >> >> Lic 773985 >> millersolar.com >> 805-438-5600 >> >> -----Original Message----- >> From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On >> Behalf Of Ray Walters >> Sent: Tuesday, January 10, 2017 2:31 PM >> To: RE-wrenches <re-wrenches@lists.re-wrenches.org> >> Subject: [RE-wrenches] Solar World Wind Damage >> >> Greetings All; >> >> I just had the dreaded call from one of my higher profile commercial >> clients: a remote radio repeater station had modules ripped off the frame >> by high winds. >> Two SW285s were damaged. The wind was strong enough to rip right through >> the aluminum side rails. We had used the proper stainless 1/4" >> bolt hardware with washers on the inside, etc. All the hardware was still >> tight, it just tore the aluminum past the washers. This is not a top down >> clamp system, but uses bolts through the mounting holes on the back of the >> module. This was all on a DP&W rack with high wind option. >> In 20 years in business, I've never seen that happen. Is there a contact >> at Solar World? I'm not getting through on the tech support line I have. >> First, I need to know what the wind rating is on the modules blowing from >> the back side, and Second, a suggested fix for the remaining modules. >> One module was completely ripped from the frame and thrown 30 yds (total >> destruction), a 2nd one has cracks in the Aluminum, but has not let go >> yet. I was thinking of adding some angle aluminum on the inside to beef >> it up. IMHO, the frames are pretty thin aluminum compared to older >> modules. I'll share some pics when available. >> >> As always thanks in advance for your comments, >> >> -- >> R.Ray Walters >> CTO, Solarray, Inc >> Nabcep Certified PV Installer, >> Licensed Master Electrician >> Solar Design Engineer >> 303 505-8760 >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.htm >> l >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
