<div dir="ltr">Hi William,<div><br></div><div>I have had good luck with the Tigo TS4-AF. Although it does require a 12VDC power supply for it's RSD transmitter, Outback, Sol Ark and Schnieder have a straight forward integration not requiring dependency of AC output from inverter. </div><div><br></div><div>Best,</div><div><br></div><div>Chris</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 31, 2022 at 12:57 PM William Miller <<a href="mailto:william@millersolar.com">william@millersolar.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-US"><div class="gmail-m_8206418340069862750WordSection1"><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Friends:</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">It is quite rare for us to install off-grid systems on roof-tops. We have one coming up with about 20kW on a large barn roof. This will be our first off-grid with a module-level rapid shutdown requirement. I see no exemptions from RSS for off-grid systems in the code. I have looked at the options and this is what I have found:</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="gmail-m_8206418340069862750MsoListParagraph"><span style="font-size:12pt;font-family:Verdana,"sans-serif""><span>1.<span style="font:7pt "Times New Roman""> </span></span></span><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Fire Raptor</span></p><p class="gmail-m_8206418340069862750MsoListParagraph"><span style="font-size:12pt;font-family:Verdana,"sans-serif""><span>2.<span style="font:7pt "Times New Roman""> </span></span></span><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Tigo TS4-F</span></p><p class="gmail-m_8206418340069862750MsoListParagraph"><span style="font-size:12pt;font-family:Verdana,"sans-serif""><span>3.<span style="font:7pt "Times New Roman""> </span></span></span><span style="font-size:12pt;font-family:Verdana,"sans-serif"">AC coupling with micro-inverters or optimizers</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">No one of these approaches seems ideal. The fire raptor requires extra wiring for control leads. The Tigo requires a wireless control system which worries me about reliability. With AC Coupling systems floating the proposed AGM batteries may be awkward. Furthermore, with AC coupled systems one cannot charge batteries unless the mini-grid is operational, a big problem.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Have any of you implemented module-level RSS on a battery-based inverter system? I looked in the archives and found no threads that apply. Thank in advance.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">William Miller</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">Miller Solar</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">805-438-5600</span></p><p class="MsoNormal"><span style="font-size:12pt;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:12pt;font-family:Arial,"sans-serif"">CA Lic. 773985</span></p><p class="MsoNormal"> </p><p class="MsoNormal"> </p></div></div>
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