Author Topic: EEVblog #1217 - My Home Solar Power System FAILED!  (Read 3163 times)

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Offline Poe

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Re: EEVblog #1217 - My Home Solar Power System FAILED!
« Reply #50 on: June 03, 2019, 07:39:16 pm »
how much is that fault going to take to pay off? how many sunlight hours did that set you back?


Exactly.




 

Offline SparkyFX

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Re: EEVblog #1217 - My Home Solar Power System FAILED!
« Reply #51 on: June 04, 2019, 05:40:22 am »
500V/7A is not particulary hard for a switch - or two in series.

I wonder if they need to be mechanically timed (one advances the other) to improve the arc breaking or if slight dimensional differences alone are sufficient. I mean the spark gap doubles over two switches just because it is double the distance, but do resistance differences between arcs inhibit two arcs in series? As in one switch pulls an arc, therefore there is not enough breakdown voltage left for the other switch, or more current = more plasma/ionized gas = better conductivity = lower voltage drop per distance, like a current dependent resistor, should such a concept exist.

This might not be very relevant for a manual operated switch, but for contactors and such.

I think such breakers/isolators exist in in actual high voltage applications.
Although recently i´ve seen a fail with a standing arc for at least two minutes and grass fire from the molten metal.
Support your local planet.
 

Offline Krysole

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Re: EEVblog #1217 - My Home Solar Power System FAILED!
« Reply #52 on: June 04, 2019, 06:45:30 am »
I stumbled on a strange piece by the ABC 7:30 report on solar systems in here in Australia. No idea why it got recommended to me, but no matter. It looked a little at panel failures, isolator switches and so on, although not in as much depth as they maybe could have. It was only for TV through, but still possibly worth a watch or read.

https://youtu.be/10Gnf-wvF7A
https://www.abc.net.au/news/2019-05-27/australias-obsession-with-cheap-solar-derailing-market-insiders/11139856

Apparently your not the only one having a bit of a problem with weather damage to the switches. Might have to have a quick look at the system on my roof at some point...hmm.
 


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