William Just so it is clear, the outback on the DC side GFI is .5 amp not a 1. amp Jerry
On Tue, Jan 21, 2020, 6:41 AM William Miller <will...@millersolar.com> wrote: > Colleagues: > > > > Not too long ago we finished a large off-grid residential power system > installation. It has a three-stack Radian 8048A with three FM80s and about > 3,000 AH of battery. The home has all the bells and whistles including VFD > drive pool pumps and home automation. > > > > We have been experiencing some GFI tripping on various AC branch > circuits. I checked the bonding scenario and it appears to be correct: > One bond only at the AC Combiner output of the inverters. > > > > We have checked N-G voltages and they seem minimal. We did find some high > THD when the generator is charging the batteries, as high as 19%. I am not > sure if this is voltage or current waveform distortion but I ordered a > Fluke power quality meter and will be testing again as soon as it arrives. > An Outback engineer told me distortion of a generator AC waveform under > charging loads is normal. > > > > Unlike the recent case reviewed on this forum--where a specific appliance > seemed to be causing problems in the PV GFI circuit, I have no indication > that one appliance is the culprit and the problem is on the AC side. > > > > As an aside, I have always been interested in the design of PV GFI > technology. It seems counterintuitive to me to deliberately un-bond any > ground-referenced system and run that bond through a breaker pole. > Nonetheless, the PV GFI circuit has not opened in this scenario. This does > not mean there is no ground fault current, it means there is not a ground > fault current in excess of 1 amps. > > > > I have reviewed all of the recent and historic posts about GFI tripping > and I don’t see anything that might help. I suspect we have plumbed the > depths of Wrenches current knowledge on this subject, but I am laying out > the scenario in case any part of this description elicits a recollection. > When we get this figured out, I will report back. > > > > Sincerely, > > > > William Miller > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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