Carl, That’s very helpful. We’ll check each module and report back. rick brown SolShine Energy Alternatives, LLC Electrical & Solar Contracting Services www.SolShineEnergy.com Check, Virginia 24072 O: 540.235.3095 M: 540.808.9502
VA Class A Contractor Lic# 2705147660 VA Master Electrician Lic# 2710062762 VA Alternative Energy Systems Installer NABCEP Certified PV Installation Professional 110112-21 > On Jun 21, 2021, at 12:15 PM, Carl Adams <cad...@sunrocksolar.com> wrote: > > > Rick, > 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. . > A second failed unit some months later had a thermal failure and this one > toasted the module. Picture 2.1. > > 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 + 25%, so in theory you could > have a number of devices which were not working and your string voltage would > not indicate that. > > 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 , > APPLICATION & TECHNICAL SUPPORT MANAGER, > MLRSD at APSmart for additional information. 737.218.8486 > <FailedAPSmart1.2.jpg> > > <FailedAPSmart2.1.jpg> > > <FailedAPSmart1.1.jpg> > > With Kind Regards > Carl Adams, President > SunRock Solar, LLC > 513.290.9072 (mobile) > 513.766.6025 (office) > > > > On Mon, Jun 21, 2021 at 11:55 AM Lloyd Hoffstatter > <ll...@sunstruckconsulting.com> wrote: >> Rick, >> I would check with SMA to make sure you have the latest firmware. >> >> Best regards, >> Lloyd >> >> Lloyd Hoffstatter >> Sunstruck Consulting >> >> Get Outlook for iOS >> From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> on behalf of >> r...@solshineenergy.com <r...@solshineenergy.com> >> Sent: Monday, June 21, 2021 11:42:36 AM >> To: RE-wrenches <re-wrenches@lists.re-wrenches.org> >> Subject: [RE-wrenches] RSD Troubleshooting Help >> >> Wrenches, >> >> I’m 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. >> >> 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’m reading the correct voltage >> - 6.75V - on both strings when in off mode. Once the Sunny Boy comes on line >> I’m reading around 10V on the faulty string and the correct voltage - ~315V >> - on the other string. >> >> 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? >> >> And as luck would have it, everything is functional at the moment. >> >> Thanks, >> >> rick brown >> SolShine Energy Alternatives, LLC >> Electrical & Solar Contracting Services >> www.SolShineEnergy.com >> Check, Virginia 24072 >> O: 540.235.3095 >> M: 540.808.9502 >> >> VA Class A Contractor Lic# 2705147660 >> VA Master Electrician Lic# 2710062762 >> VA Alternative Energy Systems Installer >> NABCEP Certified PV Installation Professional 110112-21 >> >> >> >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org >
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