<div dir="auto"><div>In case anyone is curious about the practicality of AC coupling with the MN AIO, I have three sites(one being my home/beta test site) running AC coupled (without any DC PV) working flawlessly. All connected through the AC coupling terminals. All are on early firmware versions and are solaredge inverters...I'm sure functionality has only improved with the recent FW updates. Just my experience. I don't want to encourage ones to do anything counter to what Zeke and Logan are advising.</div><div dir="auto">Sunny Regards,</div><div><br></div><div data-smartmail="gmail_signature"><br> </div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, Aug 14, 2025, 7:46 AM Zeke Yewdall via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>While the AC coupled PV system can be added to the AC backed up loads panel, this defeats a lot of the functionality of a dedicated AC coupled PV array input on the AIOs and is not recommended by most of them. In theory, yes, it works on most inverters to just add it as a negative AC load -- and I've even AC coupled an old Trace SW, and it works fine on that, despite being designed and built before AC coupling was thought of.</div><div><br></div><div>But, if it's just on the AC loads output, the inverter does not have the ability to drop the AC PV array separately from the load if it needs to for high battery charge regulating, does not have the ability to measure the PV array input on monitoring, and may have other issues.</div><div><br></div><div>Zeke</div><div dir="ltr"><br></div><div dir="ltr">> *Subject:* Re: [RE-wrenches] Adding battery to grid tie<br>
><br>
> Correct me if I'm wrong: I believe AIOs can accept AC coupled power<br>
> through the load 'output' port. That leaves the Grid and Gen inputs free<br>
> for their roles as labelled.<br>
><br>
> The AC coupled inverters connect via a breaker in the critical loads<br>
> panel.<br>
><br>
><br>
> 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>
></div><br></div>
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