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<DIV><FONT size=2 face=Arial>I meant the question largely to be a generic one
but I can give you an example:</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Buried conductors are 6AWG. No additional
grounding conductor exists between the main and detached building. As Brian
Mehalic already responded, the 60A subpanel would tough to deal with for
inverter sizing. Assume the AC disconnect is required near the main meter and so
would have to disconnect all circuits in the subpanel.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>So say we put a 50A main breaker in the 60A
subpanel to allow a Fronius IG 3.0 (3000 watt) and a string of 12 Sharp ND240s
or similar.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>The PV ground would have to hit a ground rod at the
garage and a grounding conductor would need to be buried back for
bonding at the main building--right?</FONT></DIV>
<DIV><FONT size=2 face=Arial> </FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=markf@berkeleysolar.com href="mailto:markf@berkeleysolar.com">Mark
Frye</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, April 11, 2012 9:25
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] Grid tied PV
to subpanel on detached garage?</DIV>
<DIV><BR></DIV>1 - What is the AC output rating of the PV inverter?<BR>2 -
What is the size of the feeder conductors?<BR>3 - Does the sub panel at the
garage have a main breaker of it's own?<BR>4 - Does your AHJ or utility
require anAC disconnect or not?<BR><BR>Mark Frye<BR>Berkeley Solar Electric
Systems<BR><BR><BR><BR>On 4/11/2012 7:09 AM, Aladdin Solar wrote:
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<DIV><FONT size=2 face=Arial>Wrenches:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>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?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>Thanks for your comments.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>Charlie Pickard</FONT></DIV>
<DIV><FONT size=2 face=Arial>Aladdin Solar</FONT></DIV><BR><BR>__________
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