This problem might be due to a neutral connection
problem in the electrical system. Loose neutral
connections can put 120 V loads in series. It
puts loads on both line 1 an line 2 in series for
240 V. The high resistance load (the one with the low draw) gets high voltage.
At 06:23 PM 8/11/2018, you wrote:
I am placing this inquiry out to see if anyone
else has experienced a similar experience. An
electrician friend near Taos, NM, installed a
Conext XW+ 6648 inverter on a large 2nd seasonal
(remote stand alone PV supplied) vacation home,
(used less than 10 weeks per year), it has a
large 48 VDC AGM battery (40+kW-Hr) and almost a
7.0 kW PV Array and a back-up LP gen-set. It has
a Xantrex accessories : Com-Box, charge
controllers, bat monitor, etc. The anomaly this
system exhibits is that - when the owners are
infrequently present - during each evening, for
about 90 seconds - the 120vac lights get
noticebly brighter. After this brief event, the
lights exhibit normal behavior. No lights or
appliances are functionally damaged. It is more
of a nuisance than an actual problem. This
usually happens between 9:30 and midnight. The
timing seems to be arbitrary - as no known load
either turns on or turns off in conjunction with
this event. Xantrex has been consulted and the
inverters firm ware has been upgraded and they
even sent a replacement inverter control board,
which after its replacement nothing changed. As
this is quite late at night and has been
happening both in winter and in summer months,
it is not presently believed to be associated
with the PV modules or charge controller.
Conventional wisdom implies, that if there is
some significant load was cycling in the
background - the lights would dim - not
brighten. I have never heard of anything like
this and was wondering- if any had. There are no
known large capacitive loads on the system. Any
one seen anything similar, I was asked - as I
have been doing systems in New Mexico since 1995
and I guessed it was a well/ water pressure
bladder tank system related issue . . . but
the installer has witnessed this, at night when
the water pump and well remained off. ? Item
2) some weeks ago, it was noted on this
RE-Wrenches thread that some ballast blocks,
4â x 8â x 16â were starting to suffer
decomposition and a solution was sought, I
guessed that this might be due to water seepage
and repeated freezing and thawing. Has anyone
used an inexpensive masonry sealer painted on
the blocks, to stop water wicking to the
concrete ballast blocks? There is very thick
cinder block paint (UGL) for cinder block
foundations that would be quite expensive and
polyurethane is very pricey too - I would like
to recommend that works successfully and is
economical for existing installations rather
than replacing hundreds of blocks? Thanks,
Daniel O. Duffield NABCEP Certified PV
Installation Professional (2005) NM licensed
Commercial Electrical Contractor EE98/ER01 IEEE
member 23 years
_______________________________________________
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
_______________________________________________
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