[RE-wrenches] XW Pro and the spoiled stuff if the fridge

[Matt Sherald]

Hi All,

I'm writing to ask if anyone else might have run into a similar situation.
My customer came home to dead circuits after being out of town for several
weeks.  They are grid-tied and have a BBUS with an XW Pro.  Their PV array
is AC-coupled (Enphase IQ7+).

When they arrived home all of the critical load circuits were dead.  The
other circuits were working fine.  The internet router was dead.
I got called and made a visit.  The XW was not feeding AC through to the
loads and it was not charging the batteries.

Two battery status lights on the XW were illuminated.  A value "279" was
displayed.  The small LED next to the "A"  for charging was illuminated.
No other green LED was on - no AC1, no AC2, no Event, no Equalize  .  The
batteries had been discharged, but were well above the LBCO.  I tested the
grid and it was 60Hz with 240V.  All good there.

There is no SCP.  This is one of the early installs with a Gateway and I
did not have computer stuff to get a look at any codes or other status
info.

Perplexed, and a bit frustrated, I turned off the main DC 250A breaker and
let it sit for a couple of minutes.  Then I turned the breaker back on and
the XW worked just as one would hope - the grid connected through AC1 and,
in turn, powered the critical loads and began charging the battery.

I thought that I would be able to find some answers once things were back
online and I got home to the office where I could look at Insight and
Enlighten.  Looking at the Enlighten data I could see that production had
ceased ten days prior to my visit.

Insight has no recorded Alarms/Warnings/Events for this time period.
The XW load and battery discharging data show very little draw throughout
the period which makes me believe the AC loads were not powered and the
battery drain was attributable to idle consumption of the XW, Gateway and
Battery Monitor.

A series of thunderstorms coincided with the loss of data reporting.  The
neighbors, when asked, offered that they had lost an internet router to the
same storms. They said that they didn't recall a power outage, but their
router was cooked and their PV system (Enphase) had stopped working
requiring them to contact tech support.

My gut is that a surge on the Gateway's CAT cable triggered the XW's relays
to open and stay open.  The system seems to be working just fine now and
doesn't appear to have suffered lasting damage.  Not so for the venison in
the freezer.

I'd love to hear from anyone who may have had a similar experience with the
XW or who feels like they have a fair guess as to what caused the problem.

-Matt










-- 
Matt Sherald
PIMBY Energy, LLC
304-704-5943
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