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Direct current to make a come back ?
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PS_RalphW



Joined: 24 Nov 2005
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Location: Cambridge

PostPosted: Wed May 04, 2016 10:18 am    Post subject: Reply with quote

http://www.resilience.org/stories/2016-05-03/slow-electricity-the-return-of-dc-power

Another excellent article from the Low Tech magazine.

This is the sort of intelligent design that Prof Mckay totally failed to factor in
to his models.
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emordnilap



Joined: 05 Sep 2007
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Location: Houǝsʇlʎ' ᴉʇ,s ɹǝɐllʎ uoʇ ʍoɹʇɥ ʇɥǝ ǝɟɟoɹʇ' pou,ʇ ǝʌǝu qoʇɥǝɹ˙

PostPosted: Wed May 04, 2016 10:28 am    Post subject: Reply with quote

PS_RalphW wrote:
http://www.resilience.org/stories/2016-05-03/slow-electricity-the-return-of-dc-power

Another excellent article from the Low Tech magazine.

This is the sort of intelligent design that Prof Mckay totally failed to factor in
to his models.


Quote:
To figure out what's possible, we're converting Low-tech Magazine's headquarters into an off-grid 12V DC system


Fascinating article. Sigh. I wish I was 17 again and read stuff like this. Brilliant.
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woodburner



Joined: 06 Apr 2009
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PostPosted: Wed May 04, 2016 6:59 pm    Post subject: Reply with quote

I got to the point where the article said solar panels don't create pollution. Their manufacture does, lots of it, so it's another vested interest article.
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kenneal - lagger
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PostPosted: Thu May 05, 2016 2:52 am    Post subject: Reply with quote

Compared to the pollution that nuclear doesn't create PVs contribution is quite small!
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woodburner



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PostPosted: Thu May 05, 2016 6:10 am    Post subject: Reply with quote

Rather like encouraging someone to eat their turd sandwich because the amount od turd in a plate of turd stew is much greater. As your signeture says, ".........when the last river has been poisoned...........". Plenty going on in China in the solar panel manufacture.
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clv101
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PostPosted: Thu May 05, 2016 8:10 am    Post subject: Reply with quote

woodburner wrote:
I got to the point where the article said solar panels don't create pollution. Their manufacture does, lots of it, so it's another vested interest article.

It's clear the context of that comment was local pollution in a decentralised deployment, as contrasted with local steam engines which were unpopular due to local noise and air pollution.
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woodburner



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PostPosted: Thu May 05, 2016 7:19 pm    Post subject: Reply with quote

Sweep the problem under the carpet? Not ok in my book.
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emordnilap



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PostPosted: Fri May 06, 2016 9:41 am    Post subject: Reply with quote

woodburner wrote:
I got to the point where the article said solar panels don't create pollution. Their manufacture does, lots of it, so it's another vested interest article.


Yes, it should have said 'at point of use'. A minor editorial error.
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woodburner



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PostPosted: Fri May 06, 2016 5:31 pm    Post subject: Reply with quote

That applies to nuclear power and fossil fuel generated electricity too, so it's all a bit meaningless weasel words.
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kenneal - lagger
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PostPosted: Fri May 06, 2016 6:52 pm    Post subject: Reply with quote

emordnilap wrote:
...........

Yes, it should have said 'at point of use'. A minor editorial error.


It should have said "at point of generation and use" which makes an even bigger difference.
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woodburner



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PostPosted: Fri May 06, 2016 9:54 pm    Post subject: Reply with quote

Conveniently missing out the filthy construction phase.
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kenneal - lagger
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PostPosted: Sat May 07, 2016 3:52 am    Post subject: Reply with quote

The construction phase is also quite clean although the manufacturing phase might not be quite so and the materials winning phase is no where near so. but the volume of materials used in PV is quite small compared with the other systems.

Ah! for something perfect.
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adam2
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PostPosted: Sun May 08, 2016 3:36 pm    Post subject: Reply with quote

Whilst the pollution resulting from PV module production is indeed cause for concern, it should be noted that comparisons against say coal power are not entirely fair.

When it is stated that a certain amount of pollution results from a coal burning power plant, this invariably only refers to the "day to day" chimney stack emissions.
On this basis a KWH from coal produces a known amount of pollution and a KWH from PV produces no pollution.

If one is going to consider the pollution from the manufacture of the PV module (and arguably one should) then to ensure a "level playing field" the emissions from the building of the coal burning power plant should also be considered.
The building of the power station consumes vast amounts of steel, concrete, and copper, and significant amounts of many other materials, the production and transport of which has significant environmental costs that are in addition to the ongoing coal burning.
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biffvernon



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PostPosted: Sun May 08, 2016 4:33 pm    Post subject: Reply with quote

The significant thing is that while both industries cause some pollution, that from the solar industry is within the capacity of the ecosystem to repair while the coal industry risks making civilisation as we know it impossible.
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woodburner



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PostPosted: Sun May 08, 2016 8:21 pm    Post subject: Reply with quote

What is your supporting evidence for that statement?
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