Electronics > Projects, Designs, and Technical Stuff
Lots of recalls of solar panel DC disconnect switches
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soldar:

--- Quote from: Vell on June 02, 2019, 08:11:16 pm ---A related topic, which I might post more about later, is the horrible way that many (guessing) factory workers are mistreated.
I never forgot about the safety nets between first (British: ground) and second (Brit.: first?) stories, around a multistory factory, perhaps in Taiwan, and iirc Foxconn. These nets protected pedestrians from workers who went out of higher-story windows to commit suicides.
--- End quote ---

Oh, please! Nets to protect pedestrians from the falling bodies of suicides? Really? You believe this? Can we have some corroboration?

I see these nets in Spain all the time and I thought they were for protection from falling debris when they are working on the building and there is danger of falling debris.
NiHaoMike:

--- Quote from: Vell on June 02, 2019, 08:11:16 pm ---Regarding anti-Chinese prejudice, I'm glad to see it shamed. The USA's Chinese Exclusion Act is a blot on our history. Perhaps the one thing that's unfortunate about China is its apparent willingness to make cheap, shoddy products if the customer insists on rock-bottom prices. Japan, before WW II, had a terrible reputation for shoddy products. Now, they're top-notch. They learned, and China will, too.

--- End quote ---
The rise of Chinese brands like Xiaomi, Oneplus, and Creality show that they are improving. And don't forget all the quality products that are made in China.
Vell:
I do wish I'd kept track of a link. When I read about that, I was rather more gullible; your question has me wondering. I do try hard to post responsibly. It would be generally good if I was suckered.  Your skepticism is beneficial.  :)
floobydust:
I doubt an isolator will protect a fireman, or this thread from flames. Water spray everywhere at a grounded aluminum frame, there is surely a ground fault from panel/wiring/isolator insulation failure to the water spray and thus the guy holding the nozzle or to the fire truck.
Spray a garden hose at 200-400VDC and tell me how that goes. IP54 is a joke for that, COBALTBLACK claims IP66+, assuming the cable glands and panels also meet that.

The DC disconnects seem to be mostly failing due to harsh outdoors conditions or shit manufacturing quality, or both. Having safety agency approvals insures they have been tested, instead of a fake claim to be wonderful.
Vell:
Regarding lousy products from Germany, which I hope are far from the norm, Dave Jones opened up a Gossen Metrawatt analog multimeter, and its insides were too makeshift, close to disgraceful. Sorry, but I don't recall how recent that was. He also opened up a Triplett 630 and one of the Simpson 260s. Btw, short-circuit current of the traditional 630 on its lowest resistance range is quite high, and can damage low-power semiconductors.

While on the multimeter topic, I briefly owned an Avometer Model 8; decided to void the warranty, and its innards were astonishing. Will try to write it up, sometime. Fine quality, all sorts of different ways of doing things.  Real gem was a 1/2 turn winding on the AC range autotransformer.


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