<div dir="ltr">Hi All, <div>So I went back today and updated all the programming. There was actually lots of sun too (a rare event in upstate NY this time of year)!</div><div><br></div><div>The inverters have not yet had any issues with powering the backed up loads so far. But there have been issues with selling back to the grid. One inverter was selling just fine, with the sell current right around the max sell setting. The other inverter would very quickly ramp up its sell and go way past the setting (set at 30A) and start selling at up to about 60A, and then would stop selling (but continue to power the backed up loads. When selling, the AC1 in good light would stay on green solid. Then when the one inverter would stop selling, that light would flash. Then 5 minutes or so later, it would click a bunch of times, start selling, and within about 10 seconds overshoot the setting again and kick off.</div><div><br></div><div>I tried Tumps suggestion of removing the black jumper. When I did that in each inverter, neither one would sell, but they would continue to power the backed up loads.</div><div><br></div><div>I also tried bypassing the GTI on the inverter that was having selling issues. When I did that, the AC1 in good light never came on at all, even though I verified AC voltage on the input. It never started selling, but it would at least continue to power the backed up loads. I only had it like this for about 15 minutes before I had to leave the site, so will be checking in on the system in the coming days. Last time I was there and fired it up, it worked fine to begin with and it was not until many hours later that the issues with powering the backed up loads started appearing.</div><div><br></div><div>Cheers, </div><div>Dave</div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><br></div><div><b><font face="tahoma, sans-serif">Dave Tedeyan, PE</font></b></div><div><font face="tahoma, sans-serif">Senior Engineer | Taitem Engineering, PC</font></div><div><font face="tahoma, sans-serif"><img src="https://www.taitem.com/signatures/logo.png"><br></font></div><div><font face="tahoma, sans-serif">110 South Albany Street</font><span style="font-family:tahoma,sans-serif"> | Ithaca, NY 14850</span></div><div><font face="tahoma, sans-serif">o. <u>607.277.1118 x121</u> f. 607.277.2119</font></div><div><font face="tahoma, sans-serif"><a href="http://www.taitem.com" target="_blank">www.taitem.com</a></font></div><div><br></div><div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Solar </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022</span><span style="font-family:tahoma,sans-serif;font-size:12.5pt;line-height:17.8333px"> </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Sustainability </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Energy </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Design</span><br></div><div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px"><span style="font-family:Tahoma,sans-serif;font-size:13.3333px">Certified B-Corporation since 2013</span><span style="font-size:13.3333px"><br></span></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Dec 22, 2019 at 5:11 PM <a href="mailto:bob@midnitesolar.com">bob@midnitesolar.com</a> <<a href="mailto:bob@midnitesolar.com">bob@midnitesolar.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p><br>
</p>
<p>Forgot to say that if the inverters ARE grid tied, then they will
NOT drift around in phase and will</p>
<p>be synchronized and therefore will stay in sync and be passing
through from grid to output.<br>
</p>
<p>boB<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div>On 12/22/2019 12:57 AM, Jerry Shafer
wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">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
<div dir="auto">Jerry</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Dec 20, 2019, 9:44 AM
Dave Tedeyan <<a href="mailto:dtedeyan@taitem.com" target="_blank">dtedeyan@taitem.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Hi All,
<div><br>
<div>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...</div>
<div><br>
</div>
<div>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. </div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>There are a few other things of note:</div>
<div>1. There is a Xantrex GTI for each inverter.</div>
<div>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?</div>
<div>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.</div>
<div><br>
</div>
<div>Does anyone have any ideas?</div>
<div>Cheers, </div>
<div>Dave</div>
<div>
<div>
<div dir="ltr">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
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<div><br>
</div>
<div><b><font face="tahoma,
sans-serif">Dave
Tedeyan, PE</font></b></div>
<div><font face="tahoma,
sans-serif">Senior
Engineer | Taitem
Engineering, PC</font></div>
<div><font face="tahoma,
sans-serif"><img src="https://www.taitem.com/signatures/logo.png"><br>
</font></div>
<div><font face="tahoma,
sans-serif">110 South
Albany Street</font><span style="font-family:tahoma,sans-serif"> | Ithaca, NY 14850</span></div>
<div><font face="tahoma,
sans-serif">o. <u>607.277.1118
x121</u> f.
607.277.2119</font></div>
<div><font face="tahoma,
sans-serif"><a href="http://www.taitem.com" rel="noreferrer" target="_blank">www.taitem.com</a></font></div>
<div><br>
</div>
<div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Solar </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022</span><span style="font-family:tahoma,sans-serif;font-size:12.5pt;line-height:17.8333px"> </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Sustainability </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Energy </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Design</span><br>
</div>
<div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px"><span style="font-family:Tahoma,sans-serif;font-size:13.3333px">Certified
B-Corporation since
2013</span><span style="font-size:13.3333px"><br>
</span></span></div>
</div>
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</div>
</div>
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