DRakes suggestion has the advantage of the DC side is not a voltage sensitive as the AC side and voltage drop is not as critical. allowing perhaps a 3%
On Mon, Sep 17, 2018 at 12:50 PM <drake.chamber...@redwoodalliance.org> wrote: > Another option would be to locate the inverters near the grid and run the > DC at as high a voltage as possible. Have a separate run of wire for each > of the 5 inverters. If you ran the DC at 500 V, an 11.4 kW inverter would > only draw 22.8. A. Use 2/0 AL for a little over 1% VD at full power. > > > > ----- Original Message ----- > From: > "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > > To: > "RE-wrenches" <RE-wrenches@lists.re-wrenches.org> > Cc: > > Sent: > Mon, 17 Sep 2018 09:42:01 -0700 > Subject: > [RE-wrenches] Step-up/Step-down Transformer question > > > 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 <lore...@cal-solar.com>* (530) 274-3671* > > > > <http://californiasolarco.com/referral-program/> > *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 > >
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