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 <swingjun...@gmail.com>
To: RE-wrenches@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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