<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi William,<div><br></div><div>I agree with you on the GFP.</div><div><br></div><div>There is a work around for the larger breaker size and that is to install a prebreaker from the array then to the GFP breaker then to the CC.</div><div>You then get to work on the smallest breaker size for wiring, if my understanding of the code is correct.</div><div><br></div><div>jay</div><div><br></div><div>peltz power</div><div><br></div><div><br><div><div>On Apr 17, 2012, at 6:42 PM, William Miller wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<div>
Friends:<br><br>
Here is a related problem: If we use an 80 amp GFD (ground fault
detection) breaker, even for a very small array, we have to use 3AWG CU
wire from the battery buss to the breaker and from the breaker to the FM
or MX60. This seems like a big hassle for 5 or 10 amps of
charging. A variety of sizes of GFD breakers would be
helpful.<br><br>
Here is a bigger problem: GFD breakers don't really work. All
they do is turn off the charge function in hopes that someone will find
the problem. In the meantime, the negative-to-ground bond is
removed and module mounting framework could be energized. PV GFD
breakers are completely different from standard AC GFDI (ground fault
detection and interruption) receptacles and circuit breakers. The
AC versions interrupt power upstream, the PV versions interrupt power
<i>downstream</i> from the fault.<br><br>
See:
<a href="http://millersolar.com/MillerSolar/case_studies/ground_fauilt/_ground_fault.html" eudora="autourl">http://millersolar.com/MillerSolar/case_studies/ground_fauilt/_ground_fault.html</a>
for some musings on the subject.<br><br>
As they say on TV: "There had to be a better way!"<br><br>
William Miller<br><br><br></div></blockquote></div><br></div></body></html>