<div dir="ltr">Andrew, I've seen this in multiple inverter systems when the AC voltage gets pushed outside the upper limit by the inverter output currents. One or two inverters will cycle on-off, those with the lowest setting or tolerance. Cause can be (1) high AC voltage from the utility to start with, and/or (2) high impedance looking into the grid from the inverters, usually from an undersized or loose service conductor. <div>Jeff</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 25, 2020 at 3:16 PM Jerry Shafer <<a href="mailto:jerrysgarage01@gmail.com">jerrysgarage01@gmail.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 dir="auto">Andrew<div dir="auto">What is the AC Voltage when this occurs, to much VAC will shut down the inverter. It also looks like you are clipping all the inverters during the mid day, is due to low temps or does this always happen. What is the DC MPPT voltage, is it at the upper limit.</div><div dir="auto">Jerry </div><div dir="auto">NABCEP PV inspector </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 25, 2020, 12:02 PM Andrew Truitt <<a href="mailto:atruitt@gmail.com" target="_blank">atruitt@gmail.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 dir="ltr"><div><br></div><div>Wrenches,</div><div><br></div><div>I have a couple of Solectria 36TLs at a small community solar site in CO that shut themselves down occasionally for what appears to be no reason. </div><div><br></div><div><div><img src="cid:ii_k729ndv00" alt="image.png" width="493" height="280"><br></div></div><div><br></div><div>Voltages and frequency are normal, firmware is updated, IR scan shows nothing irregular, and the other 2 inverters at the site (50TLs) are fine. It can happen under sunny or cloudy conditions. Solectria will RMA the inverters but before I go out and replace I'm curious if anyone has seen this behavior?</div><br clear="all"><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><br></div><div><div><span style="color:rgb(64,64,64);font-family:ArialMT,serif,EmojiFont;font-size:10pt">Regards, </span><br></div><div dir="ltr"><br></div><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;color:rgb(68,68,68);width:400px;font-size:9pt;font-family:Arial,sans-serif;line-height:normal"><tbody><tr><td style="padding:0px 0px 6px;font-size:12pt;color:rgb(23,147,206);width:259px"><font face="Tahoma, sans-serif">Andrew Truitt</font><span style="font-family:Arial,sans-serif"> <table cellpadding="0" cellspacing="0" style="color:rgb(68,68,68);font-size:9pt;border-spacing:0px;border-collapse:collapse;width:400px;line-height:normal"><tbody><tr><td colspan="2" width="400" 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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><span><p dir="ltr" style="line-height:1.8;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12pt;font-family:Arial;color:rgb(51,51,51);background-color:rgb(255,255,255);font-weight:700;vertical-align:baseline;white-space:pre-wrap">Jeff Irish, PE</span><span style="font-size:11pt;font-family:Arial;color:rgb(51,51,51);background-color:rgb(255,255,255);font-weight:700;vertical-align:baseline;white-space:pre-wrap"> </span><span style="font-size:10pt;font-family:Arial;color:rgb(51,51,51);background-color:rgb(255,255,255);font-style:italic;vertical-align:baseline;white-space:pre-wrap"><a href="https://medium.com/gender-inclusivit/why-i-put-pronouns-on-my-email-signature-and-linkedin-profile-and-you-should-too-d3dc942c8743" target="_blank"></a></span><span style="font-size:10pt;font-family:Arial;color:rgb(51,51,51);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap"> | Vice President </span></p><p dir="ltr" style="line-height:1.8;margin-top:0pt;margin-bottom:0pt"><font face="Arial"><span style="font-size:12px;white-space:pre-wrap"></span></font><span style="font-size:10pt;font-family:Arial;color:rgb(243,140,25);background-color:rgb(255,255,255);font-weight:700;vertical-align:baseline;white-space:pre-wrap">Sun</span><span style="font-size:10pt;font-family:Arial;color:rgb(243,140,25);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap">Common.com</span><span style="font-size:10pt;font-family:Arial;color:rgb(243,140,25);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap"> </span><span style="font-size:10pt;font-family:Arial;color:rgb(113,113,113);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap"> | </span><span style="font-size:10pt;font-family:Arial;color:rgb(113,113,113);background-color:rgb(255,255,255);font-weight:700;vertical-align:baseline;white-space:pre-wrap">Main: </span><span style="font-size:10pt;font-family:Arial;color:rgb(113,113,113);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap">845-876-3767</span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><font color="#717171" face="Arial"><span style="font-size:13.3333px;white-space:pre-wrap;background-color:rgb(255,255,255)">13 Hook Road, Rhinebeck, NY 12572</span></font></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10pt;font-family:Arial;color:rgb(113,113,113);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap"><a href="https://suncommon.com/solar-winter-discount-2020/" target="_blank"><img src="https://suncommon.com/wp-content/uploads/2020/02/202002_1kFebruary_EmailSig-HV_428x90.png"></a></span></p><p dir="ltr" style="line-height:1.25;margin-top:0pt;margin-bottom:0pt;display:block;max-width:400px"><span style="font-size:9pt;font-family:Arial;color:rgb(121,121,121);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap">SunCommon believes that everyone has the right to a healthy environment and </span><span style="font-size:9pt;font-family:Arial;color:rgb(121,121,121);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap">brighter future\u2014and renewable energy is where it starts. Energy from the sun can </span><span style="font-size:9pt;font-family:Arial;color:rgb(121,121,121);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap">power our lives and build vibrant communities. Our mission is to tear down barriers </span><span style="font-size:9pt;font-family:Arial;color:rgb(121,121,121);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap">to clean energy and use our business as a force for good.</span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><br></p><div><span style="font-size:10pt;font-family:Arial;color:rgb(113,113,113);background-color:rgb(255,255,255);vertical-align:baseline;white-space:pre-wrap"><br></span></div></span></div>