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
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 <jco...@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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