<p>Also keep in mind that when AC coupling with legacy PV inverters without frequency-Watt capability, the battery based inverter will have reduced ability to regulate the battery charge.</p>
<p>A modern GT inverter will give you faster and more accurate charging. The older GT's, may not be good enough for me, and certainly not my clients.</p>
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<pre> </pre>
<pre><strong><span style="font-size: small;">Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" target="_blank">http://members.sti.net/offgridsolar/</a>
e-mail <a href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a>
text 209 813 0060</span></strong></pre>
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<p>On Fri, 12 Jun 2020 10:08:28 -0700, Mark Frye <markf@berkeleysolar.com> wrote:</p>
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<p>Thanks Jay,</p>
<p>I talked again with Magnum.</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:</p>
<p>- the Magnum will have shifted the frequency by 0.5 Hz when the DC voltage rises to Absorb + 4V.</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.</p>
<p> </p>
<div class="moz-cite-prefix">On 6/12/2020 7:12 AM, Jay wrote:</div>
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<div dir="ltr">Hi Mark</div>
<div dir="ltr"> </div>
<div dir="ltr">I found this which might be of help. </div>
<div dir="ltr"> </div>
<div dir="ltr"><a href="https://www.magnum-dimensions.com/sites/default/files/MagArchive/AN-0002-AC-Coupling-Rev-5-10.pdf">https://www.magnum-dimensions.com/sites/default/files/MagArchive/AN-0002-AC-Coupling-Rev-5-10.pdf</a></div>
<div dir="ltr"> </div>
<div dir="ltr">Jay</div>
<div dir="ltr">Peltz power. </div>
<div dir="ltr"><br />
<blockquote type="cite" style="padding-left:5px; border-left:#1010ff 2px solid; margin-left:5px; width:100%">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 /> </blockquote>
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<div dir="ltr"><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 (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 /> <span>_______________________________________________</span><br /> <span>List sponsored by Redwood Alliance</span><br /> <span></span><br /> <span>List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></span><br /> <span></span><br /> <span>Change listserver email address & settings:</span><br /> <span><a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></span><br /> <span></span><br /> <span>List-Archive: <a class="moz-txt-link-freetext" href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a></span><br /> <span></span><br /> <span>List rules & etiquette:</span><br /> <span><a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a></span><br /> <span></span><br /> <span>Check out or update participant bios:</span><br /> <span><a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a></span><br /> <span></span></div>
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