[RE-wrenches] Inverter output fluctuations

[Dave Angelini Offgrid Solar]

I think I would try eliminating things. Turn off the AC coupling for a 
few days and get results. Turn of DC solar and get results. Measure AC 
voltage with a scope or just observe voltage during the flicker. Are all 
of the lights flickering? Are they on dimmers?  Are there any loads 
failing that could be the source? Is the output with-in spec? Rock solid 
60 HZ right.

Do an AC bypass of XW with the genset and check for flicker symptoms.

Are they on Insight? They really need it for you to monitor.  Are there 
any faults, warnings or events ? Check history.  There are a few 
settings in the old XW+ that could have been glitched by a surge or 
nearby lightning strike.

XW+ could have a damaged FET. Open the unit and do a  visual.
There would be a smell and transistor fragments on the bottom right side 
of the power bridge. 90% of XW failures have visual evidence.

While you have it open, Check the DSP sensing and control board, both 
LEDs (light-emitting diodes) D24 and D25 are on.

Last thing is a DC power down of the unit and the DC buss for 5 minutes. 
  If that does not work, then a reset to factory values.
This is off an old list I got from Support many years ago and combined 
with my findings over the years. Really rare for this kind of weirdness 
and why it would be getting worse without visual evidence.

Good Luck Howie!

Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail  offgridsolar at sti.net
text 209 813 0060

On 2023-07-03 12:42 pm, Howie Michaelson via RE-wrenches wrote:

> Hi All,
> I upgraded an old clients' off-grid system about five years ago to a 
> Schneider XW6848+ and 2 Blue Ion 2.0 cabinets (32kWh). When the 
> batteries were moving toward full, if the charge rate was on the higher 
> side via generator or solar (AC coupled w/SolarEdge 6kW and DC coupled 
> with an FM 80), they would start to get pulsating lights similar to 
> symptoms of other older inverters when using a generator for charging. 
> The solution for this pulsation has usually been to kick back the AC 
> charge amperage just enough so the pulsating calmed down to a tolerable 
> inconsequential level.  And that worked in this case as well.
> However, a few weeks ago, the pulsating became more noticeable and has 
> now become fairly intolerable.  To my knowledge, no settings changes we 
> made within the previous year, and these clients would be loath to make 
> any changes, so I doubt there were any. More puzzling is the pulsating 
> has started to happen at seemingly random times not related to 
> charging.  It happens at night or pre-dawn mornings without the 
> generator, or during the afternoons with solar charging.  And it is 
> getting progressively worse.
> Anyone have any thoughts on why that would start getting worse now?
> 
> Howie
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