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--></style></head><body lang="EN-US" link="blue" vlink="purple" style="line-break:after-white-space"><div class="WordSection1"><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Rick:</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Two questions:</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-family:"Verdana","sans-serif";color:#1f497d">If you don’t have PV on this system, what are those glassy, flat things on the roof wired to the DC inputs of your Sunny Boy?</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-family:"Verdana","sans-serif";color:#1f497d">Think to yourself: What component(s) on this project could possibly produce high voltage DC?</span></p><p class="MsoListParagraph"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I think the answer to both questions is… PV panels. I highly suspect you have a PV ground fault. Proceed with caution.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">On the Sunny Boy I would check the DC voltage between L1 and ground, between L2 and ground and between neutral and ground. Do this in the operational configuration that is producing the DC voltage on the Gen inputs.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">While you are at it, check DC voltages between the Sunny Boy DC inputs to ground and between the Sunny Boy Chassis and ground.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Check your GEC, GEC bonding conductor and all of the system EGCs.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I would also check the GFDI fuse on the Sunny Boy. </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">William Miller</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Miller Solar</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">805-438-5600</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><a href="http://www.millersolar.com/"><span style="color:blue">www.millersolar.com</span></a></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">CA Lic. 773985</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p></div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:rick@solshineenergy.com">rick@solshineenergy.com</a> [mailto:<a href="mailto:rick@solshineenergy.com">rick@solshineenergy.com</a>] <br><b>Sent:</b> Tuesday, October 15, 2024 12:03 PM<br><b>To:</b> <a href="mailto:william@millersolar.com">william@millersolar.com</a>; RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Sol-Ark Gen Input</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal">William,</p><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">There’s no PV on this system. It’s AC coupled to an SMA SB5.0. </p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">As a test, we turned off the Grid input, Load output, and turned off the battery breaker. As expected, the high voltage DC eventually bled to 0V. Turning things on in this order: Battery, Grid, then Load resulted in the high voltage appearing once the Grid relay kicked on. Actually, the high voltage ramped up slowly once the Grid relay turned on.</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">We’ve been installing these for years and have never seen this. Then again, we’ve never measured that point.</p><div><p class="MsoNormal"><br><br></p><div><p class="MsoNormal">On Oct 15, 2024, at 2:32 PM, William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:</p></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Rick:</span></p></div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">If I had to guess I’d say you have a PV wiring fault. The PV positive may be shorted to ground. <span class="apple-converted-space"> </span><br>This would make the inverter chassis negative in relation to ground. <span class="apple-converted-space"> </span></span></p></div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">The logic I use is to ask what is the likely source of DC at 195 volts? It is most likely the PV circuits, wouldn’t you say?</span></p></div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">If the DC Fault is not eternal then it must be internal to the inverter. This could be a dangerous situation. I would proceed with caution.</span></p></div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Try completely isolating the PV from the inverter as a start.</span></p></div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Good luck.</span></p></div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">William Miller</span></p></div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Miller Solar</span></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">17395 Oak Road, Atascadero, CA 93422</span></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">805-438-5600</span></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><a href="http://www.millersolar.com/"><span style="color:purple">www.millersolar.com</span></a></span></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">CA Lic. 773985</span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p></div><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><div style="border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:currentcolor currentcolor"><div><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org"><span style="color:purple">re-wrenches-bounces@lists.re-wrenches.org</span></a>]<span class="apple-converted-space"> </span><b>On Behalf Of<span class="apple-converted-space"> </span></b>rick--- via RE-wrenches<br><b>Sent:</b><span class="apple-converted-space"> </span>Tuesday, October 15, 2024 11:09 AM<br><b>To:</b><span class="apple-converted-space"> </span>RE-wrenches<br><b>Cc:</b><span class="apple-converted-space"> </span><a href="mailto:rick@solshineenergy.com"><span style="color:purple">rick@solshineenergy.com</span></a><br><b>Subject:</b><span class="apple-converted-space"> </span>[RE-wrenches] Sol-Ark Gen Input</span></p></div></div></div><p class="MsoNormal"> </p><div><p class="MsoNormal">Back on the Sol-Ark topic again. We have a customer whose 12kW is measuring -195VDC to ground from L1 and L2 with the Gen breaker open. L1 to L2 = 0V. I know the Gen input can be configured as an output, but reading a high DC voltage to ground is concerning. The generator has never been run. System is operating normally. </p></div><div><p class="MsoNormal"> </p></div><div><div><p class="MsoNormal">Anyone have a Sol-Ark accessible that could verify what they’re reading?</p></div><div><p class="MsoNormal"> </p></div><div><div><p class="MsoNormal">Thanks in advance. </p></div></div><div><p class="MsoNormal"> </p><div><div><p class="MsoNormal">Rick Brown</p></div><div><div><p class="MsoNormal">Solshine Energy </p></div></div><div><div><p class="MsoNormal">Solar Electric Contracting Services </p></div></div><div><div><p class="MsoNormal"><a href="http://www.solshineenergy.com/"><span style="color:purple">www.solshineenergy.com</span></a></p></div></div><div><div><p class="MsoNormal">Roanoke, VA</p></div></div><div><div><p class="MsoNormal">Office: 540.235.3095</p></div></div><div><div><p class="MsoNormal">Mobile: 540.808.9502</p></div></div><div><p class="p1"><span class="s1">CONFIDENTIALITY NOTICE -- This email is intended only for the person(s) named in</span></p><p class="p1"><span class="s1">the message header. 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Thank you.</span></p></div><div><p class="MsoNormal"> </p></div></div></div></div><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">_______________________________________________<br>List sponsored by Redwood Alliance<br><br>Pay optional member dues here:<span class="apple-converted-space"> </span></span><a href="http://re-wrenches.org/"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";color:purple">http://re-wrenches.org</span></a><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif""><br><br>List Address:<span class="apple-converted-space"> </span></span><a href="mailto:RE-wrenches@lists.re-wrenches.org"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";color:purple">RE-wrenches@lists.re-wrenches.org</span></a><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif""><br><br>Change listserver email address & settings:<br></span><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";color:purple">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</span></a><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif""><br><br>There are two list archives for searching. 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Unless otherwise indicated, it contains information that is<br>confidential, privileged and/or exempt from disclosure under applicable law. If you have<br>received this message in error, please notify the sender of the error and delete the<br>message. Thank you.”</span><span style="color:black"></span></p></div></div></div><p class="MsoNormal"> </p></div></div></body></html>