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<p>Hi Dave,</p>
<p>Right. Attached is a Magnum AC coupled line diagram and also an instruction sheet. On the line diagram, they show a diversion load, but you will likely use a protective relay, set to trigger when voltage goes over absorption for the batteries. </p>
<p>Since Magnum doesn't have a voltage sensitive relay, you will probably want to use a Morningstar Relay Driver (manual attached) to control the protective relay.</p>
<p>Best,</p>
<p>Drake</p>
<p><br /></p>
<p>Drake Chamberlin</p>
<p>Athens Electric LLC</p>
<p>Ohio Electrical Contractor’s License 44810</p>
<p>CO Master Electrician’s License 4526</p>
<p>NABCEP Certified PV Installation Professional</p>
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<p id="reply-intro">On 2022-10-07 16:23, Dave Tedeyan via RE-wrenches wrote:</p>
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<div dir="ltr">Hi Drake,
<div>Just to make sure I understand you correctly, I could tie in a new grid tie inverter on the load side of the Magnum inverter. Then when the grid is up, the power will be able to backfeed through the MMP175-30D panel to the AC input (which will get rewired to the grid). And when the grid is down, the Magnum inverter will be able to take the power from the grid tie inverter on the load side of the Magnum inverter to charge the batteries?</div>
<div>Cheers,</div>
<div>Dave</div>
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<div class="v1gmail_attr" dir="ltr">On Fri, Oct 7, 2022 at 1:00 PM Drake Chamberlin via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer">re-wrenches@lists.re-wrenches.org</a>> wrote:</div>
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<p>The grid tie inverter can sell through the Magnum relay. When the grid goes down, it will feed the batteries.</p>
<p><br /></p>
<p><br /></p>
<p>Drake Chamberlin</p>
<p>Athens Electric LLC</p>
<p>Ohio Electrical Contractor's License 44810</p>
<p>CO Master Electrician's License 4526</p>
<p>NABCEP Certified PV Installation Professional</p>
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<p id="v1m_-123909124470117033m_-5245873933401546893reply-intro">On 2022-10-07 11:42, Dave Tedeyan via RE-wrenches wrote:</p>
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<div dir="ltr">Hi All,
<div> </div>
<div>I've got someone who wants to tie their off-grid system with a Magnum inverter (which I think is a 4024 PAE inverter) to the grid. Since the Magnum inverter cannot be grid tied, I was wondering if there is some kind of simple grid tie inverter that can be the grid interface, while keeping the existing system in tact. </div>
<div> </div>
<div>Otherwise, I see two paths here. The less expensive path would be to ditch the batteries and connect the panels to a grid tie inverter. Otherwise it seems that we will need to get another battery based inverter that is meant to be grid connected to replace the Magnum.</div>
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<div>Cheers,</div>
<div>Dave<br clear="all" />
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