[RE-wrenches] GFP and multiple charge controllers

[jay peltz]

Hi William,

I agree with you on the GFP.

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.
You then get to work on the smallest breaker size for wiring, if my understanding of the code is correct.

jay

peltz power


On Apr 17, 2012, at 6:42 PM, William Miller wrote:

> Friends:
> 
> 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.
> 
> 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 downstream from the fault.
> 
> See:  http://millersolar.com/MillerSolar/case_studies/ground_fauilt/_ground_fault.html for some musings on the subject.
> 
> As they say on TV: "There had to be a better way!"
> 
> William Miller
> 
> 

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