[RE-wrenches] Imbalanced Legs in 3-Phase systems

Jeff Clearwater, Village Power Design jeffc at villagepower.com
Thu Aug 7 10:13:57 PDT 2008


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
gosolar at villagepower.com
NABCEP (tm) Certified Solar PV Installer

Voice: 413-259-3776
Fax: 413-825-0703
65 Schoolhouse Rd
Amherst, MA 01002
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