I have heard the 6kW imbalance rule. However when I spoke with the area Engineer from the Utility, he said he would not be at all concerned with 10% imbalance. in fact unless I was to exceed 20% not to worry. The system was a 800 amp 480 volt. He of course said my concern is more where I feed the panel to connect. Which is the concern of the electrical inspector. Darryl
--- On Thu, 8/7/08, Jeff Clearwater, Village Power Design <[EMAIL PROTECTED]> wrote: > From: Jeff Clearwater, Village Power Design <[EMAIL PROTECTED]> > Subject: [RE-wrenches] Imbalanced Legs in 3-Phase systems > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Thursday, August 7, 2008, 12:13 PM > Hi Wrenches, > > How does one determine how much imbalance can be tolerated > on a 3 phase system? > > I'd like to feed 2 SMA SB5000s at 277 VAC into a 480 > VAC panel > instead of 1 13 KW Solectria at 480VAC as the PV system is > only 9500 > Watts STC. The main on the backfed service panel is 600 A. > But I'm > not that sure of the loads as it's new construction and > hasn't been > characterized. > > What are the appropriate calcs to do here? > > Thanks! > > Jeff C. > -- > ~~~~~~~~~~~~~ > Jeff Clearwater > Village Power Design > Sustainable Energy & Water Solutions for Home & > Village > http://www.villagepower.com > [EMAIL PROTECTED] > NABCEP (tm) Certified Solar PV Installer > > Voice: 413-259-3776 > Fax: 413-825-0703 > 65 Schoolhouse Rd > Amherst, MA 01002 > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`~ > _______________________________________________ > List sponsored by Home Power magazine > > RE-wrenches@lists.re-wrenches.org > > http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine RE-wrenches@lists.re-wrenches.org http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
