<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body 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;" data-unique-identifier=""></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 <re-wrenches@lists.re-wrenches.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><style>@font-face { font-family: Calibri; }
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div.WordSection1 { page: WordSection1; }</style><div class="WordSection1"><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""><div><image003.png></div></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"">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""><div><image005.png></div></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"">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/">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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