Forgot to say that if the inverters ARE grid tied, then they will NOT
drift around in phase and will
be synchronized and therefore will stay in sync and be passing through
from grid to output.
boB
On 12/22/2019 12:57 AM, Jerry Shafer wrote:
Well l would start simple and get a sync cable and make sure that they
are al least staying g in correct phasing, then look closely at the
programming, look at the grid voltages and settings, take it out of
IEEE for test purposes only, you might find out you have a board
that's out of calibration causing the issue but start simple
Jerry
On Fri, Dec 20, 2019, 9:44 AM 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
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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