[RE-wrenches] RSD Troubleshooting Help
Bill Battagin
frenergy at psln.com
Mon Jun 21 17:54:47 EDT 2021
Rick,
Its possible you won't find it that way because its already
fried and in an open circuited or bypass mode. But keep us updated,
we're very interested.
Bill
Feather River Solar Electric
On 6/21/2021 2:44 PM, rick at solshineenergy.com wrote:
> I’m going to try the thermal camera trick before resorting to lifting
> modules.
>
> 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 5:42 PM, Jeremy Coxon
>> <jcoxon at sunwindpowerinc.com> wrote:
>>
>> We are going through a similar scenario right now with APSmart RSD’s
>> 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’re back to doing a hard reset
>> to get array to start up.
>>
>> 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’m thinking
>> they’re just going to say it’s not their problem. APS’s
>> troubleshooting guide basically says lift each panel to find the
>> problem. Not a happy camper!
>>
>> Jeremy Coxon NABCEP
>> Certified MWBE
>>
>> Sent from my iPhone
>>
>>> On Jun 21, 2021, at 12:43 PM, "rick at solshineenergy.com"
>>> <rick at solshineenergy.com> wrote:
>>>
>>> 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 <cadams at 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
>>>> <lloyd at sunstruckconsulting.com
>>>> <mailto:lloyd at 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 <https://aka.ms/o0ukef>
>>>> ------------------------------------------------------------------------
>>>> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org
>>>> <mailto:re-wrenches-bounces at lists.re-wrenches.org>> on behalf
>>>> of rick at solshineenergy.com <mailto:rick at solshineenergy.com>
>>>> <rick at solshineenergy.com <mailto:rick at solshineenergy.com>>
>>>> *Sent:* Monday, June 21, 2021 11:42:36 AM
>>>> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org
>>>> <mailto:re-wrenches at 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 <http://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
>>>>
>>>>
>>>>
>>>>
>>>>
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