[RE-wrenches] Conext xw+ 6848 inverter 1.5 minute voltage increase

[Dave Angelini Offgrid Solar]

Good point about the neutral ! Go thru the panel/ light circuits and
re-torque. Set up the combox to log L1 and  L2. --Dave

On Mon, 13 Aug 2018 09:04:37 -0400, Drake
<drake.chamberlin at redwoodalliance.org> 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, 
>>4†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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