The single phase - 3phase change is too difficult and expensive. Stay with single phase. I have done this successfully with a step up and down transformer. You, of course, need to select the correct transformer. Transformers seem to have a price advantage using standard voltages. For example, starting at building 240 to 480 and then use 480-volt inverters. This will require longer strings for the 480-volt single phase inverter. another way is to use 240 to 240-480-volt and carry a neutral. then select inverters that can operate with no neutral, I call them floating output. This cuts current in half, voltage drop or rise by 1/4 allowing smaller wire.
On Mon, Sep 17, 2018 at 11:42 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 <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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