[RE-wrenches] Grid tied PV to subpanel on detached garage?

[Brian Mehalic]

Well the size of the subpanel sounds like a limiting factor, unless you
find someway  around that via a bus/breaker size difference or upgrading to
something larger.  And the AHJ/utility may want the PV disconnect by the
main as you mentioned. However, 705.12(7) allows connecting to panelboards
connected in series; and additional labeling requirements in 690.54 and
690.56(B) would apply if the PV system disconnecting means is not located
with the service disconnecting means.

On Wed, Apr 11, 2012 at 10:09 AM, Aladdin Solar
<cpickard at aladdinsolar.com>wrote:

> **
> Wrenches:
>
> There's probably an obvious answer but please help me think this through.
> Here's the situation--comes up all the time: The PV array and grid-tied
> inverter will be located on a detached building (garage or pole barn,
> etc.). The existing power to the building is a 240V 60A subpanel connected
> to the main panelboard at the house or main building via buried cable. If
> we obey buss bar loading and wire sizing, etc, is there any reason why we
> can't or shouldn't install the small grid tied PV system and tie it into
> the garage subpanel instead of trenching new lines back to the house and
> hit the main panel there? One hitch I see is that if we want a PV system AC
> disconnect near the main meter, the whole garage would end up on that. Have
> I overlooked an NEC or inverter requirement?
>
> Thanks for your comments.
>
> Charlie Pickard
> Aladdin Solar
>
>
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-- 
========================
Brian Mehalic
NABCEP Certified Solar PV Installer™ R031508-59
IREC ISPQ Certified Affiliated Instructor/PV US-0132
PV Curriculum Developer and Instructor
Solar Energy International
Carbondale, CO 81623
http://www.solarenergy.org
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