Ok: Priority loads. <div><br clear="all"><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><br>William Miller<br>Miller Solar.com<br>805-438-5600<br><a href="http://www.millersolar.com">www.millersolar.com</a><br></div></div></div><div><br></div><div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sat, Aug 9, 2025 at 10:26\u202fAM Foxfire Energy <<a href="mailto:dan@foxfire-energy.com">dan@foxfire-energy.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Umm, just an FYI, I actually got dinged for labeling the AC output panel from a battery backup inverter as "Critical Loads".. Critical loads (Critical Branch circuits) are defined in article 100 of the NEC as circuits associated with Patient Care.. AC loads
from battery backup inverters are more appropriately defined as "Dedicated Loads".. </div>
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Maybe someone could correct me here, but I'm under the impression most garden-variety inverters are not rated for Critical Load applications.</div>
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<div id="m_-1507854923252947855divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>> on behalf of William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
<b>Sent:</b> Saturday, August 9, 2025 1:03 PM<br>
<b>To:</b> RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
<b>Cc:</b> William Miller <<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>><br>
<b>Subject:</b> Re: [RE-wrenches] Adding battery to grid tie</font>
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<div>Correct me if <span>I'm wrong: I believe AIOs can accept AC coupled power through the load \u2018output\u2019 port. That leaves the Grid and Gen inputs free for their roles as labelled. </span>
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<div dir="auto"><font face="-apple-system, sans-serif" style="color:rgb(0,0,0)">The AC coupled inverters connect via a breaker in the critical loads panel. </font></div>
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<div dir="ltr" data-smartmail="gmail_signature">William Miller<br>
Miller Solar.com<br>
805-438-5600<br>
<a href="http://www.millersolar.com" target="_blank">www.millersolar.com</a><br>
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<div dir="ltr">On Sat, Aug 9, 2025 at 9:50\u202fAM david quattro via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br>
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<div dir="auto">True. if you want to do grid, gen, and AC Couple then you need a transfer switch or contactor. </div>
<div dir="auto"> Likewise I haven\u2019t touched a Powerwall, nor an Enphase battery. </div>
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<div dir="ltr">On Sat, Aug 9, 2025 at 9:36\u202fAM jay via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br>
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<div style="line-break:after-white-space">One big issue with the AIO\u2019s is that you can\u2019t do grid, generator and ac coupling to the best of my understanding
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<div>I do like the idea of just removing the old GT inverter and stuffing that into the AIO, elegant</div>
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<div>yes its my understanding that Tesla won\u2019t accept generator. While many are pissed off at eg4, I won\u2019t touch tesla.</div>
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<div>and FYI you can buy the same inverter at Fortress. </div>
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<div>thanks everyone.</div>
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<div>jay</div>
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<div>On Aug 9, 2025, at 10:28\u202fAM, Tyrone Houck via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:</div>
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<div>Midnite AIO and Sol-Ark both work great for AC coupling in my experience. If anyone is new to "All In One" inverters I recommend having tech support walk you through commissioning, check firmware, etc. the first time. </div>
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<div dir="ltr">On Sat, Aug 9, 2025, 8:47\u202fAM William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br>
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Two options:
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<div dir="auto">1. AC couple existing inverter to a battery capable inverter. </div>
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<div dir="auto">2. Replace existing inverter. </div>
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<div dir="auto">I favor option 2. </div>
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<div dir="auto">Option 1 is only preferred if gaining access to the existing inverter for replacement is difficult. An example would be a micro-inverter system.</div>
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<div dir="auto">New AIO inverters allow true high voltage PV input so the existing stringing will probably not need to be modified. </div>
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<div dir="auto">I\u2019m new to this so type of upgrade so I welcome any corrections to these opinions. I did replace a Sunny Boy in my shop with a Soul Ark and it\u2019s working great!</div>
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<div dir="ltr" data-smartmail="gmail_signature">William Miller<br>
Miller Solar.com<br>
805-438-5600<br>
<a href="http://www.millersolar.com/" rel="noreferrer noreferrer" target="_blank">www.millersolar.com</a><br>
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<div dir="ltr">On Sat, Aug 9, 2025 at 8:26\u202fAM Jay via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer noreferrer" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br>
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Is there a consensus as to what equipment to use for adding battery backup to normal GT inverter?
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I\u2019ve had a few people ask and I actually haven\u2019t done it. <br>
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Thx <br>
Jay<br>
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