Here in upstate NY, we have certainly had multiple inverter breakers land in the main panel. In a situation like yours, we have also left the old system as a load side connection, and then turned the new system in to a supply side connection so that the bus bar in the main panel is not overloaded. No inspectors here seem to care as long as the labeling shows what is happening. Although we are also fortunate that most inspectors around here will not make us fix old work as long as we did not touch it and it presents no safety hazard.
Cheers, Dave *Dave Tedeyan, PE* Senior Engineer | Taitem Engineering, PC 10 Verizon Lane | Lansing, NY 14882 o. *607.930.3481* x6 f. 607.277.2119 www.taitem.com Solar • Sustainability • Energy • Design B-Corporation Best for the World 2018 Honoree On Mon, Feb 25, 2019 at 11:42 AM William Miller <will...@millersolar.com> wrote: > Friends: > > > > I have an NEC code question on an upcoming project. It is a home that has > an existing 8 kW ground-mounted grid-tied system. The owner wants to add > another 10 kW of grid-tied PV. My question is about 705.12, point of > connection. Specifically section (D)(1). That section states: > > > > *The source interconnection of one or more inverters installed in one > system shall be made at a dedicated circuit breaker or fusible > disconnecting means.* > > > > So if there are going to be two inverters on premise, do the outputs have > to be aggregated to connect via one circuit breaker? This might be > difficult to do as the exiting inverter is connected via a different > sub-panel than the one that is planned to receive the new inverter output. > > > > This article > <https://iaeimagazine.org/magazine/2014/01/16/load-side-pv-connections/> > addresses the question. > > > > I would be very grateful if any of you can share any experience you might > have in interpreting this section of the code. > > > > Thanks in advance. > > > > William > > > _______________________________________________ > 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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