<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I\u2019m going to try the thermal camera trick before resorting to lifting modules. <br><br><div dir="ltr"><span style="background-color: rgba(255, 255, 255, 0);">rick brown<br>SolShine Energy Alternatives, LLC<br>Electrical & Solar Contracting Services<br>www.SolShineEnergy.com<br>Check, Virginia 24072</span><div><span style="background-color: rgba(255, 255, 255, 0);">O: 540.235.3095<br>M: 540.808.9502<br><br>VA Class A Contractor Lic# 2705147660<br>VA Master Electrician Lic# 2710062762<br>VA Alternative Energy Systems Installer <br>NABCEP Certified PV Installation Professional 110112-21</span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div></div><div dir="ltr"><br><blockquote type="cite">On Jun 21, 2021, at 5:42 PM, Jeremy Coxon <jcoxon@sunwindpowerinc.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<meta http-equiv="content-type" content="text/html; charset=utf-8">We are going through a similar scenario right now with APSmart RSD\u2019s and a SMA 7.0 that will start up and run, then the next day no start up at dawn. Perform a hard reset on inverter and array starts up, runs all day, then the next morning we\u2019re back to doing a hard reset to get array to start up. <div><br></div><div>Very simple system 2 strings of 12, voltages at inverter around 8V (12x0.7=8.4V) - short run with oversized conductors means very small voltage drop thankfully. SMA says we need to be on site to troubleshoot, but without the little APS RSD Eye, I\u2019m thinking they\u2019re just going to say it\u2019s not their problem. APS\u2019s troubleshooting guide basically says lift each panel to find the problem. Not a happy camper!</div><div><div><br><div dir="ltr"><div>Jeremy Coxon NABCEP </div><div>Certified MWBE</div><div><br></div>Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Jun 21, 2021, at 12:43 PM, "rick@solshineenergy.com" <rick@solshineenergy.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<meta http-equiv="content-type" content="text/html; charset=utf-8">Carl,<div>That\u2019s very helpful. We\u2019ll check each module and report back. <br><br><div dir="ltr"><span style="background-color: rgba(255, 255, 255, 0);">rick brown<br>SolShine Energy Alternatives, LLC<br>Electrical & Solar Contracting Services<br>www.SolShineEnergy.com<br>Check, Virginia 24072</span><div><span style="background-color: rgba(255, 255, 255, 0);">O: 540.235.3095<br>M: 540.808.9502<br><br>VA Class A Contractor Lic# 2705147660<br>VA Master Electrician Lic# 2710062762<br>VA Alternative Energy Systems Installer <br>NABCEP Certified PV Installation Professional 110112-21</span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div></div><div dir="ltr"><br><blockquote type="cite">On Jun 21, 2021, at 12:15 PM, Carl Adams <cadams@sunrocksolar.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<div dir="ltr">Rick,<div>I was recently troubleshooting a similar problem. Open circuit voltage on all strings was as expected but under load one string was showing almost no power. Tracked this down to a failed APSmart device which had clear signs of thermal damage. Pictures 1.1 and 1.2. .<div>A second failed unit some months later had a thermal failure and this one toasted the module. Picture 2.1.</div><div><br></div><div>These devices can make it difficult to do any meaningful string level testing. The devices output a nominal 0.7 volts in open circuit conditions. That documentation says this voltage reading is <u>+</u> 25%, so in theory you could have a number of devices which were not working and your string voltage would not indicate that.</div><div><br></div><div>APSmart does make a test device which can help you verify the functionality. The device is called RSD-EYE+ Detector. You can contact YI Kang , <b><span style="font-family:inherit;color:rgb(127,127,127);border:1pt none windowtext;padding:0in">APPLICATION & TECHNICAL SUPPORT MANAGER,</span></b></div><div><b><span style="font-family:inherit;color:rgb(127,127,127);border:1pt none windowtext;padding:0in">MLRSD </span></b>at APSmart for additional information. <span style="color:rgb(104,104,108);font-size:12px"> </span><span style="color:rgb(104,104,108);font-size:12px">737.218.8486</span></div><div><div><FailedAPSmart1.2.jpg></div><br><div><div dir="ltr" data-smartmail="gmail_signature"><div dir="ltr"><div><div><FailedAPSmart2.1.jpg></div><br><div><FailedAPSmart1.1.jpg></div><br><div>With Kind Regards<div>Carl Adams, President</div><div>SunRock Solar, LLC</div>513.290.9072 (mobile)</div><div>513.766.6025 (office)</div><br></div></div></div></div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 21, 2021 at 11:55 AM Lloyd Hoffstatter <<a href="mailto:lloyd@sunstruckconsulting.com" target="_blank">lloyd@sunstruckconsulting.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">
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Rick,</div>
<div dir="ltr" style="color:rgb(0,0,0);background-color:rgb(255,255,255)">
I would check with SMA to make sure you have the latest firmware.</div>
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Best regards,</div>
<div dir="ltr" style="color:rgb(0,0,0);background-color:rgb(255,255,255)">
Lloyd</div>
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<div dir="ltr" style="color:rgb(0,0,0);background-color:rgb(255,255,255)">
Lloyd Hoffstatter</div>
<div dir="ltr" style="color:rgb(0,0,0);background-color:rgb(255,255,255)">
Sunstruck Consulting</div>
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<div id="gmail-m_7432443947316214792gmail-m_1138851491947336934gmail-m_3567001989742486314gmail-m_-8526887617016525303divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>> on behalf of <a href="mailto:rick@solshineenergy.com" target="_blank">rick@solshineenergy.com</a> <<a href="mailto:rick@solshineenergy.com" target="_blank">rick@solshineenergy.com</a>><br>
<b>Sent:</b> Monday, June 21, 2021 11:42:36 AM<br>
<b>To:</b> RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
<b>Subject:</b> [RE-wrenches] RSD Troubleshooting Help</font>
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<div>Wrenches,<br>
<br>
I\u2019m in need of some troubleshooting help on a newly installed system with rapid shutdown. System consists 2 SMA SB5.0-1 SP-US-41 (RSD version), RSD devices are APS RSD-S-PLC. Each SB is configured with two strings of 9. Modules are REC Alpha 360s.
<br>
<br>
This system was fully functional for about 1 week before things went awry. Initial symptoms were that one of the two strings read 0V 0A on the display while the other read ~315V, 5A. The RSD devices output ~700mV each when in the off mode (a nice verification
feature). I\u2019m reading the correct voltage - 6.75V - on both strings when in off mode. Once the Sunny Boy comes on line I\u2019m reading around 10V on the faulty string and the correct voltage - ~315V - on the other string.
<br>
<br>
The above seems to indicate that each RSD is getting sufficient DC voltage from the module. Short of pulling each module and doing a visual check what else can I look at? How do you isolate a faulty RSD device?<br>
<br>
And as luck would have it, everything is functional at the moment. <br>
<br>
Thanks,<br>
<br>
rick brown<br>
SolShine Energy Alternatives, LLC<br>
Electrical & Solar Contracting Services<br>
<a href="http://www.SolShineEnergy.com" target="_blank">www.SolShineEnergy.com</a><br>
Check, Virginia 24072<br>
O: 540.235.3095<br>
M: 540.808.9502<br>
<br>
VA Class A Contractor Lic# 2705147660<br>
VA Master Electrician Lic# 2710062762<br>
VA Alternative Energy Systems Installer <br>
NABCEP Certified PV Installation Professional 110112-21<br>
<br>
<br>
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