Currently up in the air as to whether 2020 will allow that on 1- and 2- family houses. If so then yes...currently don’t know of any.
Brian > On Sep 18, 2018, at 2:45 PM, Jay <jay.pe...@gmail.com> wrote: > > Does anyone make a 1000vdc single phase inverter? > Would reduce wire costs dramatically > > Jay > Peltz power. > >> On Sep 18, 2018, at 11:36 AM, Lorenzo Ortiz <lore...@cal-solar.com> wrote: >> >> Thanks for all the input guys. After looking at the 3 phase with >> transformer options with some transformer manufacturers, that has been >> pretty much ruled out due to complexity/cost. >> With single phase step-up and step-down transformers, even at 600VAC, it >> still requires some monster wire. >> The best solution seems to be placing the inverters next to the POI and just >> running long strings from the array back to the inverters and accepting up >> to 4%-5% voltage drop. And that's with #8 instead of the usual #10 AND >> accounting for worst-case production. >> >> Man, sometimes this solar stuff is just crazy... >> >>> On Tue, Sep 18, 2018 at 10:15 AM, Blake Gleason >>> <bl...@sunlightandpower.com> wrote: >>> Good advice already on this thread. A couple of points to consider: >>> >>> 1. Re: step-up/step-down option (probably what I'd do): definitely pay >>> attention to transformer spec to minimize both magnetization and operating >>> losses. Newer DOE 2016-compliant transformers are MUCH better than before, >>> and that's just the minimum standard. If you really want to minimize >>> magnetization losses, you can always design a relay/timer to disconnect the >>> transformers at night (from the interconnection side), although I've found >>> that this setup is either very expensive or too unreliable (nuisance >>> tripping upon re-connect, timer gets "off" cycle somehow, etc). >>> >>> 2. I think someone mentioned a 480V single-phase inverter. I'm not aware >>> of a high-quality product meeting that description. Is there one? All of >>> the "480V" single-phase inverters I'm aware of are 277V (line to neutral), >>> which is hardly worth the transformer effort (versus 240V). >>> >>> 3. Definitely use aluminum wire for the long run. If wire size is still >>> too large, even with step up/down tranformers, consider allowing slightly >>> increased voltage drop at full power (say, 5%), and, depending on typical >>> grid voltage at the site, change taps on one of the transformers to err on >>> the low side (from inverters' point-of-view), to keep the inverters from >>> tripping at upper voltage limit at full power (max voltage drop/rise). >>> >>> >>> Blake >>> >>>> On Tue, Sep 18, 2018 at 9:57 AM, Jerry Shafer <jerrysgarag...@gmail.com> >>>> wrote: >>>> Lorenzo >>>> You might want to look at relocating the inverter(s) closer to the meter >>>> instead of the array, one reason is even if there is some line loss at >>>> full power its less as the voltage goes up and the inverter does not see >>>> the line resistance that can cause high voltage issues at the inverter. >>>> Some engineers use more side of peak performance than full power, this >>>> keeps wite size down and does not effect output >>>> Jerry >>>> >>>> On Sep 17, 2018 9:42 AM, "Lorenzo Ortiz" <lore...@cal-solar.com> wrote: >>>> Wrenches, >>>> >>>> We have a PV array situated about 900' from the POI (240V 1PH). We >>>> initially spec'd (5) 11.4kW inverters and the combined output would be >>>> 238A. The wire size required for this current over that distance is cost >>>> prohibitive. >>>> >>>> A solution was to use a single 50kW 3 phase inverter at the array and then >>>> convert it to 240V... somehow? Is anyone familiar with how to go about >>>> doing this? My thought was to have a step down transformer at the POI and >>>> pull off two legs to get 240V. Is this even a thing? >>>> >>>> The other, more expensive option is to use a step up transformer at the >>>> array and a step down at the POI to get us a smaller wire size. >>>> >>>> Thanks for any input. >>>> >>>> >>>> -- >>>> Loren Ortiz Commercial PV Designer >>>> >>>> lo...@cal-solar.com (530) 274-3671 >>>> >>>> >>>> >>>> >>>> Showroom located at: 149 E Main St. Grass Valley, CA 95945 >>>> _______________________________________________ >>>> 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 >>>> >>>> >>> >>> >>> >>> -- >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> Blake Gleason - PE, LEED AP >>> Director of Innovation & Technical Excellence >>> >>> P: 510.845.2997 x128 >>> E: bl...@sunlightandpower.com >>> W: sunlightandpower.com >>> >>> See how universities are using business as a force for good with solar! >>> >>> _______________________________________________ >>> 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 >>> >>> >> >> >> >> -- >> Loren Ortiz Commercial PV Designer >> >> lo...@cal-solar.com (530) 274-3671 >> >> >> >> >> Showroom located at: 149 E Main St. Grass Valley, CA 95945 >> _______________________________________________ >> 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 >
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