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<p>Thanks Jay,</p>
<p>I talked again with Magnum.<br>
</p>
<p>I have the latest Rev 6.1 MS-PAE 4448 so the exact implementation
has changed from that described in AN002, 5/10. The current Rev.
has changes designed to improve interaction with the GT inverters.
I didn't really get to the bottom of that. But the critical aspect
of this remains unchanged:<br>
</p>
<p>- the Magnum will have shifted the frequency <down now> by
0.5 Hz <sufficient to knock the GT inverters off-line> when
the DC voltage rises to Absorb + 4V.<br>
</p>
<p>This makes more sense than the 6V I had in my notes (which may
have meant 6V above Float.)</p>
<p>With all this in mind, I think I will plan on using this feature
as a backup to an AC dump load controller set to maintain Float
voltage.<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 6/12/2020 7:12 AM, Jay wrote:<br>
</div>
<blockquote type="cite"
cite="mid:686E2BE0-0091-4EC7-A4BA-B5C3F89584E4@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Hi Mark</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">I found this which might be of help. </div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><a
href="https://www.magnum-dimensions.com/sites/default/files/MagArchive/AN-0002-AC-Coupling-Rev-5-10.pdf"
moz-do-not-send="true">https://www.magnum-dimensions.com/sites/default/files/MagArchive/AN-0002-AC-Coupling-Rev-5-10.pdf</a></div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Jay</div>
<div dir="ltr">Peltz power. </div>
<div dir="ltr"><br>
<blockquote type="cite">On Jun 12, 2020, at 6:59 AM, Mark Frye
<a class="moz-txt-link-rfc2396E" href="mailto:markf@berkeleysolar.com"><markf@berkeleysolar.com></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">\ufeff<span>Looking for confirmation from Wrenches who
know Magnum inverters:</span><br>
<span></span><br>
<span>- MS-PAE</span><br>
<span></span><br>
<span>-ME-RC</span><br>
<span></span><br>
<span>- Frequency shift enabled (battery type "Custom")</span><br>
<span></span><br>
<span>- AC coupled PV inverters w/o frequency shift capability</span><br>
<span></span><br>
<span>Function:</span><br>
<span></span><br>
<span>At Absorb voltage frequency shift is zero, at Absorb
voltage + 6 V, shift is 0.5 Hz <grid ties pushed
off-line> (in 0.3 volt increments)</span><br>
<span></span><br>
<span>This is from my notes from a tech support call, but I am
wondering if I have it mixed up. Protecting at 6 volts above
the Absorb seems a bit high.</span><br>
<span></span><br>
<span>Thanks,</span><br>
<span></span><br>
<span>Mark</span><br>
<span></span><br>
<span></span><br>
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