On Dec 20, 2019, at 2:18 PM, Lloyd Hoffstatter
<[email protected]
<mailto:[email protected]>> wrote:
Dave,
Guessing it’s a synchronization problem between the two inverters.
Depending on the placement of the grid tie breakers, the two
inverters are presenting themselves as either in parallel (2 x 120v
sources on the same leg) or “series” (120 / 240 on two 120V legs).
The attached manual excerpt and tech note talk about both. Seems
that you need a synch cable in either case, recently did a rebuild on
an SW 5048 (pm for internals rebuilder info) and needed cable to get
both inverters to work properly.
Have at least one grid-tie / backup system that has been running for
years with dual SW / GTI’s – time for battery replacement, rest of
system still going…
Best regards,
Lloyd
Lloyd Hoffstatter
Sunstruck Consulting
Sent fromMail <https://go.microsoft.com/fwlink/?LinkId=550986>for
Windows 10
*From:*Dave Tedeyan <mailto:[email protected]>
*Sent:*Friday, December 20, 2019 1:03 PM
*To:*[email protected] <mailto:[email protected]>;RE-wrenches
<mailto:[email protected]>
*Subject:*Re: [RE-wrenches] Xantrex SW 4048 grid tie mystery
Dave,
Sorry, misspeak on my part. It is DC negatives and grounds that are
tied together. No neutrals in the DC box.
Cheers,
Dave
*Dave Tedeyan, PE*
Senior Engineer | Taitem Engineering, PC
110 South Albany Street | Ithaca, NY 14850
o._607.277.1118 x121_ f. 607.277.2119
www.taitem.com <http://www.taitem.com/>
Solar •Sustainability • Energy • Design
Certified B-Corporation since 2013
On Fri, Dec 20, 2019 at 12:57 PM Dave Angelini Offgrid Solar
<[email protected] <mailto:[email protected]>> wrote:
Why would neutral be in the DC conduit box? This just wrong but I
doubt this is the problem.
Since this never worked properly or has not in 13 years, I would
suggest replacement with modern equipment. SW from xantrex has
been out of support for around 15 years and always was a headache
grid tied, in my opinion.
*Dave Angelini Offgrid Solar*
*"we go where powerlines don't"*
*http://members.sti.net/offgridsolar/*
*e-mail [email protected] <mailto:[email protected]>*
*text 209 813 0060*
On Fri, 20 Dec 2019 12:44:42 -0500, Dave Tedeyan
<[email protected] <mailto:[email protected]>> wrote:
Hi All,
I am someone's last ditch effort to get their system working
which has been non-functional since a few months after
installation, 13 years ago...
After getting some new batteries in there, I can at least
fire it up. It is a grid tie with battery backup situation
with two Xantrex SW4048 inverters. Each inverter is kind of
like its own system with two Outback MX60 CC's per inverter,
and each inverter powers its own 120V backed up loads panel.
They do not see each other until their 60A single pole
breakers in the main panel.
What seems to be happening is that after turning on the
inverters the AC1 in good light will flash for about 30
seconds, then it syncs up to the grid and the light stays on
solid. But then after a little bit, that light will start
flashing, indicating that the utility power has been dropped,
when it has not actually been dropped. Then at some point the
backed up loads would lose power. The customer says that
every 1-10 minutes, they would lose the backed up loads for
10-90 seconds. This happened all night long until they
bypassed the inverters.
There are a few other things of note:
1. There is a Xantrex GTI for each inverter.
2. I see in the manual there is information about stacking
the inverters, but I am guessing in this setup this not
necessary or would even be counter productive to stack the
inverters. Not sure if the inverters not being stacked could
cause one of them to unsync with the utility?
3. Neutrals and grounds are bonded in their main panel, but
also in each of the Xantrex DC breaker boxes. I was going to
separate them in the DC breaker boxes, but found that there
is no way to isolate the battery negative bus from the box
itself, and figured it would be dodgy to unground the
enclosure. So I am also not sure if the multiple N-G bonds
could be causing these issues.
Does anyone have any ideas?
Cheers,
Dave
*Dave Tedeyan, PE*
Senior Engineer | Taitem Engineering, PC
<5DD17443B6814684BEA5BA6A3C5C2E3A.gif>
110 South Albany Street | Ithaca, NY 14850
o._607.277.1118 x121_ f. 607.277.2119
www.taitem.com <http://www.taitem.com/>
Solar •Sustainability • Energy • Design
Certified B-Corporation since 2013
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