[RE-wrenches] Exploding RSD Unit

Mon Aug 30 10:16:30 EDT 2021

Brian, can you respond to the email regarding CMP and this issue?  
Provide some guidance?  Chris

On 8/28/2021 11:09 AM, Brian Mehalic wrote:
> Movement? Maybe, but as far as I can tell it’s just a forum to 
> complain as I see no activity that could actually impact the NEC® via 
> the clearly defined and delineated process. Also there are a few 
> flat-out false claims on the site, along with a call to action to fix 
> module level shutdown by…having module level shutdown in the junction 
> box? Most of the complaints seem to come down to connector 
> standardization (which obviously was not the issue with the APS 
> meltdown that started this thread).
>
> Brian
>
>> On Aug 28, 2021, at 7:07 AM, drake.chamberlin at redwoodalliance.org wrote:
>>
>> 
>>
>> There is a movement to do away with module level shutdown.
>>
>> https://www.fixmlsd.com/?utm_campaign=solarbuilder_comment&utm_medium=email&utm_source=fixmlsd 
>> <https://www.fixmlsd.com/?utm_campaign=solarbuilder_comment&utm_medium=email&utm_source=fixmlsd>
>>
>> FixMLSD has convincing arguments that MLSD is less safe than safe 
>> than an arc fault protective device with a standard string 
>> configuration. Given the many problems with MLSD devices, it seems 
>> likely that this is true.
>>
>> Drake
>>
>>
>> Drake Chamberlin
>>
>> Athens Electric LLC
>>
>> Ohio Electrical Contractor’s License 44810
>>
>> CO Master Electrician’s License 4526
>>
>> NABCEP Certified PV Installation Professional
>>
>>
>> ---
>>
>>
>> On 2021-08-27 09:02, Tump wrote:
>>
>>> I would once again say that; we as an industry can influence not 
>>> only the writing of the code but with what we are /buying/ OR /not 
>>> buying./
>>> If the devices we are required to install to make things "more safe 
>>> & reliable", at the cost of our livelihoods & reputations, we all 
>>> need to make the folks that are building the RSD crap and those who 
>>> require installation of questionably safe & reliable crap aware of 
>>> these problems.
>>> WE can thru either going to the code development  meetings AND NOT 
>>> buying or installing this stuff. Not too easy when a huge amount of 
>>> solar is rooftop installs. As many of the installers in the NE know 
>>> its not a single level ranch were installing this stuff on, short 
>>> season & man lift required.
>>> Tell your supplier why you are not buying that brand, let  your 
>>> supplier & folks on the list what manufacture has good reliable 
>>> products AND tech support that we can understand, who we can get in 
>>> a timely fashion, and get the satisfaction of a prompt replacement. 
>>>  IF we don't sell it they won't have a job or a market.
>>>> On Aug 26, 2021, at 2:09 PM, Jeremy Coxon 
>>>> <jcoxon at sunwindpowerinc.com <mailto:jcoxon at sunwindpowerinc.com>> wrote:
>>>>
>>>> Carl,
>>>> Did you get any kind of joy out of APSmart on that failure?
>>>> I will say that their tech support guy did at least try to be 
>>>> helpful, but the language barrier was really really steep and their 
>>>> distribution channels are less than ideal.  Their response to a 
>>>> request for compensation was that they would not be profitable if 
>>>> they had to pay for truck rolls for such a low cost item.  I really 
>>>> don't think they GET IT.  We've been in business for over 16yrs and 
>>>> this one failure could easily have ended that run.
>>>> I cannot imagine we're alone here.  I was told by AP that their 
>>>> failure rate was 0.2%. Now, I come from a reliability engineering 
>>>> background in petro chemical/ big pharma where a 0.2% failure rate 
>>>> would be catastrophic.  Can you imagine that 2 out of every 1000 
>>>> pills made could cause death?  We engineered secondary systems and 
>>>> multiple quality checks to contain catastrophic consequences for 
>>>> components that had know failure rates higher than acceptable 
>>>> values.  A simple solution to this fire initiation issue would be a 
>>>> metal enclosure instead of plastic casing.  That still doesn't 
>>>> really solve the problem of extra connections though.
>>>>
>>>> Best Regards,
>>>> Jeremy Coxon NABCEP # 091308-21
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>
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-- 
             Christopher Warfel
                      ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
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