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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>My vague recollection of a similar problem I saw 10 yrs ago was
that the surges and sags of a balancing transformer like the T240 are greater
than that of a true isolation transformer. Whereas the T240 has both primary
and secondary sides sharing a neutral, the surge that the generator sees becomes
too high. I recall we fixed this by using a 2400VA acme isolation
transformer. Can\u2019t really remember the engineering explanation, but you may
want to explore this avenue.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Mike Kocsmiersky<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Principal<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Spirit Solar Inc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
drake.chamberlin@redwoodalliance.org
[mailto:drake.chamberlin@redwoodalliance.org] <br>
<b>Sent:</b> Tuesday, March 19, 2019 6:50 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Outback Voltage Spikes?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Hi
Jay,<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>The
diversion load is AC, and controlled by the Aux output dump load function on
the MX 60. The aux output triggers a relay that opens the 1000 W, space heater
dump load <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Since
this is an AC coupled system, the dump load is between the inverter and the
Stirling generator, fed from the off grid service panel where the AC coupling
takes place. The Stirling puts out close to 1000 W. <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>When
the Stirling is charging batteries, the FET board on the Outback is working
hard, turning the AC into DC. When the batteries reach the programmed voltage
level, the relay triggers and the power goes to an electric space heater. The
inverter has little to do. <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>A
sketch of the setup is attached. <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>The
problem seems to occur when there is a change in the load. It can also be
other loads that cause the Stirling to go into high voltage shutdown <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Thanks,<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Drake
<o:p></o:p></span></p>
</div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><br>
----- Original Message -----<o:p></o:p></span></p>
<div id=origionalMessageFromField>
<div>
<p class=MsoNormal style='background:#E4E4E4'><b><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif"'>From:<o:p></o:p></span></b></p>
</div>
<p class=MsoNormal style='background:#E4E4E4'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif"'>"RE-wrenches" <re-wrenches@lists.re-wrenches.org><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
<div id=origionalMessageToField>
<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>To:<o:p></o:p></span></b></p>
</div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>"RE-wrenches"
<re-wrenches@lists.re-wrenches.org><o:p></o:p></span></p>
<div id=origionalMessageSentField>
<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Cc:<o:p></o:p></span></b></p>
</div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Sent:<o:p></o:p></span></b></p>
</div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Tue,
19 Mar 2019 08:29:33 -0700<o:p></o:p></span></p>
<div id=origionalMessageSubjectField>
<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Subject:<o:p></o:p></span></b></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif"'>Re: [RE-wrenches] Outback Voltage Spikes?<br>
<br>
<br>
Hi Drake,<br>
<br>
Can you explain the diversion load more. <br>
Dc or ac<br>
Size, Watts<br>
What type of load<br>
How is it turned on, off<br>
<br>
My reasoning is that you seem to point to a connection between diversion load
and shut down. <br>
<br>
Thx<br>
Jay<br>
<br>
<br>
<br>
<br>
> On Mar 19, 2019, at 6:25 AM, drake.chamberlin@redwoodalliance.org wrote:<br>
> <br>
> Hello Wrenches,<br>
> <br>
> We have an Outback VFX3648 inverter AC coupled to a Stirling Generator. We
use an Outback autotransformer to get the 240 V needed to match the Stirling.
The Stirling generator must run continuously, as it is difficult to start up
after a shut down.<br>
> <br>
> The system works flawlessly for many hours. At some point, usually when
the dump load kicks on, the generator shuts down on a high voltage error. High
voltage is about 264 V. We have never seen voltage that high on the system. <br>
> <br>
> We replaced the control board on the inverter, and the output voltage
appears very stable. The Stirling people say that the Outback must be putting
out high voltage spikes that are so brief that we will not be able to see them
with a voltmeter. <br>
> <br>
> Can an Outback inverter create such spikes? <br>
> <br>
> Thanks,<br>
> <br>
> Drake <br>
> <br>
> <br>
> <br>
> <br>
> <br>
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