Electronics > Projects, Designs, and Technical Stuff

Lots of recalls of solar panel DC disconnect switches

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mikerj:

--- Quote from: AndersJ on May 31, 2019, 12:21:46 am ---How do solar panel DC disconnect switches differ from other switches?
Why is this a topic here, emphasizing ”solar panel DC disconnect”?

--- End quote ---

Because Dave's solar installation has failed due to a bad isolation switch.  I agree the topic is very random and assumes everyone has watched Dave's video.

https://www.eevblog.com/forum/blog/eevblog-1217-my-home-solar-power-system-failed!/

ogden:

--- Quote from: mikerj on May 31, 2019, 11:29:27 am ---Because Dave's solar installation has failed due to a bad isolation switch.  I agree the topic is very random and assumes everyone has watched Dave's video.

--- End quote ---

Topic is educational. Many may not know dangers of mechanical DC switching. Demonstration of DC switch arcing which does not happen in case of AC: https://youtu.be/mQpzwR7wLeo?t=359

mikerj:

--- Quote from: ogden on May 31, 2019, 11:59:12 am ---
--- Quote from: mikerj on May 31, 2019, 11:29:27 am ---Because Dave's solar installation has failed due to a bad isolation switch.  I agree the topic is very random and assumes everyone has watched Dave's video.

--- End quote ---

Topic is educational. Many may not know dangers of mechanical DC switching. Demonstration of DC switch arcing which does not happen in case of AC: https://youtu.be/mQpzwR7wLeo?t=359

--- End quote ---

Fair point, I didn't state that very well! I don't know why I used the word "topic", I meant that the OP's post is completely without context and appears very random if you haven't watched Dave's video.

Circlotron:

--- Quote from: Siwastaja on May 31, 2019, 06:08:10 am ---
--- Quote from: wasyoungonce on May 30, 2019, 11:41:15 pm ---Pretty sure most isolators come from China....which explains everything.

--- End quote ---

Unnecessary, rasist, and plainly wrong.


--- End quote ---
I think the statement is nationalist, not racist.
Condemning Asian people rather than the Chinese nation would be racist.

floobydust:

--- Quote from: Siwastaja on May 31, 2019, 06:08:10 am ---... here in Finland total shit gets designed and/or produced.

--- End quote ---

This looks like a cowboy installation, from the Katko website. 390 panels 100kW.
The panels and PVM disconnects with just loose wires in a homemade sheet metal box  :o
Rain is sure to get in. At least there is a ground wire. I hope the panels aren't just sitting on the wood. Unless there is no wind in Finland?

Solar electrical equipment somehow can ignore mains electrical safety standards.
Approvals are required on components, wire, boxes etc. but this install looks hokey.

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