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Here is Robin's 2 cents worth on this subject....<br>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In
a PV input circuit to a charge controller that has a 63 or 80
amp DC-GFP, it is perfectly legal to use a small wire. That is
because you will also have the appropriate sized breaker in
series with the DC-GFP breaker. If you want to use 10AWG wire,
you will need a 30 amp DC breaker in series with your 63 or 80
amp DC-GFP breaker. The DC-GFP is being used as a switch, not as
a breaker. I used to use an 80 amp switch on the dual Outback
DC-GFP rather than a breaker, but it really does not matter if
it is a breaker or a switch. The real over-current disconnect
breaker is the device that should determine your wire size. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’m
not sure why Outback changed the DC-GFP to the battery circuit?
It will work, but you still are required to have another breaker
in series with it. The NEC intends for the DC-GFP to be
installed in the PV circuit. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If
you need a 100 amp DC-GFP, then you will need to use a Classic.
I cannot think of any system today that would require a 100 amp
DC-GFP though.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Robin
Gudgel<o:p></o:p></span></p>
<span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">MidNite
Solar</span><br>
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cite="mid:6.0.1.1.2.20120417180352.02904358@millersolar.com"
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<blockquote type="cite" class="cite" cite=""> <br>
On 4/17/2012 11:08 AM, Nathan Stumpff wrote: <br>
<blockquote type="cite" class="cite" cite="">Wrenches,<br>
<br>
In a job coming up I have a customer with an existing
FM60 controller, 520 watt (!!) array. We are doing a
ton of work, including adding a 4 kW solar array with
Classic 150 charge controller. I am trying to figure out
how to handle the GFP.<br>
<br>
For the Classic, I need a 90 or 100 A output breaker
minimum. 80 A is not an option. The OutBack dual GFP is
80 A, and so it not an option.<br>
<br>
Is there a 100 A GFP breaker assembly I have just never
seen? Is there a way to use the Classic’s GFP to run an
external relay via AUX (to trip the FM60 output breaker
at the same time)? Any ideas?<br>
<br>
Thanks,<br>
-Nathan<br>
<br>
--<br>
Nathan J. Stumpff - Arctic Sun, LLC<br>
NABCEP Ceritified PV Installer #091209-175<br>
<a moz-do-not-send="true"
href="mailto:nathan@arcticsun-llc.com">nathan@arcticsun-llc.com</a><br>
Office: 907/457-1297<br>
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