[RE-wrenches] Direct Grid Tie Upgrade - drawing attached

[Dave Click]

Carl, it looks like you're already Code-noncompliant thanks to the 100A 
garage panel having 100A utility, 20A PV, and 20A wind breakers 
supplying it. Adding an additional 20A of PV of course doesn't help 
things. I'd replace the 100A panel with a 150A+ (so probably a 200A), 
keeping the 100A main.

100A utility + 20A PV + 20A wind + 20A new PV = 160A < 200A bus

I'd get into 2005 vs 2008 NEC breaker issues here, but it's apparent 
that the local inspector doesn't care!

I'd also suggest that you tie all your electrodes together, contrary to 
what's shown in your schematic. Cue the discussion of ground loops.

DKC

-------- Original Message --------
Subject: [RE-wrenches] Direct Grid Tie Upgrade - drawing attached
From: Carl Adams <swingjunkie at gmail.com>
To: RE-wrenches at lists.re-wrenches.org
Date: 2009/9/2 15:11

> Hello Wrenches,
> 
> I have a prospect who has an existing PV system and a small wind
> turbine already in place.  He is interested in adding additional
> capacity via another small grid tie system.  The attached drawing
> outlines the existing and proposed installation.  My question has to
> do with the grid tie in.  Given the existing connections for the 2
> existing DGT inverters can I connect as proposed in the drawing or
> would I need to perform a line side tap on the primary feed.
> 
> Alternative suggestions appreciated.
> 
> Carl Adams
> SunRock Solar, LLC
> 
> 
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