Also check the inverter syncing, if they aren't in sync you can have
the wave forms become additive and have higher voltages too.
Ray Walters
Remote Solar
303 505-8760
On 8/13/18 12:03 PM, Ray wrote:
Good Call Drake, I've definitely had that problem before too. Neutral
became disconnected, and the voltage on one leg got so high it damaged
some equipment: garage door opener, heating controls, microwave, oven
controls.... Funny thing was when the loads were roughly balanced,
everything seemed normal; close to 120 vac on each leg, and 240 vac
loads were not effected.
Ray Walters
Remote Solar
303 505-8760
On 8/13/18 7:04 AM, Drake wrote:
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 8†x 16†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
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