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Rick,</div>
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I would check with SMA to make sure you have the latest firmware.</div>
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Best regards,</div>
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Lloyd</div>
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Lloyd Hoffstatter</div>
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Sunstruck Consulting</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of rick@solshineenergy.com <rick@solshineenergy.com><br>
<b>Sent:</b> Monday, June 21, 2021 11:42:36 AM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Subject:</b> [RE-wrenches] RSD Troubleshooting Help</font>
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<div class="PlainText">Wrenches,<br>
<br>
Im 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). Im reading the correct voltage - 6.75V - on both strings when in off mode. Once the Sunny Boy comes on line Im 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">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>
<br>
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