Thx Brian. I guess I was thinking that 50kw + was probably A darn big house and probably be outbuildings that the inverters would be installed on.
Yea bringing 1000vdc to a house is a bit much but then we said that with 600v too. Jay Peltz power > On Sep 18, 2018, at 6:34 PM, Brian Mehalic <br...@solarenergy.org> wrote: > > 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 >> > _______________________________________________ > 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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