<div dir="auto">And just to muddy the waters a little, 2023 NEC uses AC Connected and DC connected wording in place of coupled. Same concept, new name. </div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Oct 28, 2023 at 5:01 PM Roland - RES 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="auto">Agreed and we'll understand the differences, all of our SMA SI systems utilize both dc charging and AC coupled charging.<div><br><br><div dir="ltr"><div dir="ltr"><span style="border-collapse:collapse;background-color:rgba(255,255,255,0)"><div dir="ltr" align="left" style="margin-left:0pt"><table style="border:none;border-collapse:collapse"><tbody><tr style="height:84pt"><td style="vertical-align:middle;padding:5pt;overflow:hidden"><p dir="ltr" style="line-height:1.38;text-align:center;margin-top:0pt;margin-bottom:0pt"><span style="vertical-align:baseline"><span style="border:none;display:inline-block;overflow:hidden;width:164px;height:80px"><img src="https://lh4.googleusercontent.com/R2pJqufzOLnyX7mZh5-xO1OEIH4lQB3r3iSLTQTEqvrIu-49s-fpYbAu3ULVxV-xeY78oSboKRb8RrrU5ZLCk5Mu4D-srDEsQrNBafl0FFwF4Yt6R3PmdIshOxSDcBolRWFLJYuVRIrXqZFlv9j-avA" width="164" height="80" style="margin-left:0px;margin-top:0px"></span></span></p></td><td style="vertical-align:top;padding:5pt;overflow:hidden"><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-weight:700;vertical-align:baseline">Roland Shackelford</span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="vertical-align:baseline">President / Owner</span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="vertical-align:baseline">NABCEP PVIP #<span dir="ltr">091209-162</span></span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="vertical-align:baseline">Office <span dir="ltr">808.775.7410</span></span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="vertical-align:baseline">Mobile <span dir="ltr">808.938.9239</span></span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-style:italic;vertical-align:baseline">Power Solutions for Generations </span><a href="https://www.renewablenergy.com/" target="_blank"><span style="vertical-align:baseline">Renewable Energy Services, Inc.</span></a></p></td></tr></tbody></table></div></span></div><div dir="ltr"><span style="border-collapse:collapse;background-color:rgba(255,255,255,0)"><div><div><br></div><div><span style="border-collapse:collapse">" Where there is integrity, there will be trust. Where there is trust, there will be an atmosphere for success." - Sadhguru</span></div></div></span></div></div><div dir="ltr"><br><blockquote type="cite">On Oct 28, 2023, at 10:17 AM, William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">Friends:</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">I am starting to get the impression that there is a diversion on the understanding of the definition of AC coupling within the industry.  I think this definition needs to be clarified.</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">Below is a diagram of what I understand is a DC coupled system (I hope these diagrams come through):</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""></span></p><div><image003.png></div><p></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">A battery inverter that receives AC power into an AC input port is <u>not</u> AC coupled.</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">Here is an AC-coupled system:</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""></span></p><div><image005.png></div><p></p></div></div></blockquote></div></div><div dir="auto"><div><blockquote type="cite"><div dir="ltr"><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">What makes AC-Coupled systems unique are the problems presented by sending power <u>backwards</u> through a battery inverter.  This is not how battery inverters were originally designed to operate.  These systems require careful consideration to avoid battery overcharging.</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">Do we have consensus on this definition?</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">William Miller</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Miller Solar</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">805-438-5600</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><a href="http://www.millersolar.com/" target="_blank">www.millersolar.com</a></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">CA Lic. 773985</span></p><p class="MsoNormal"> </p><p class="MsoNormal"> </p></div>
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