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Closing on the 33% efficiency goal.

 
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biffvernon



Joined: 24 Nov 2005
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Location: Lincolnshire

PostPosted: Sun Mar 27, 2016 9:54 pm    Post subject: Closing on the 33% efficiency goal. Reply with quote

Looks like there's potential for the price of solar pv to keep dropping.

http://www.businessinsider.com/scientist-have-found-a-way-to-recycle-sunlight-2016-3?IR=T
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kenneal - lagger
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PostPosted: Mon Mar 28, 2016 5:56 am    Post subject: Reply with quote

Research from Cambridge. What's the betting that they can't get investment to commercialise it in this country and the profits from the invention go abroad!! Again!!!
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cubes



Joined: 10 Jun 2008
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PostPosted: Thu Apr 07, 2016 9:31 pm    Post subject: Reply with quote

Yup, no chance it'll be developed here. How many technologies/ideas does that make now?
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biffvernon



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PostPosted: Wed May 18, 2016 7:00 am    Post subject: Reply with quote

34% efficiency

http://reneweconomy.com.au/2016/unsw-solar-team-achieves-huge-leap-in-solar-cell-efficiency-29541
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PS_RalphW



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PostPosted: Wed May 18, 2016 7:56 am    Post subject: Reply with quote

Very impressive, but it is not clear if it will ever be cheaper than existing technologies per KWh - it is four separate semiconductor technologies (3 silicon based and one germanium) behind a prism which splits the light into different wavelengths, so that each wavelength falls onto a cell optimised to absorb it.

It will need to be made cheap enough that the extra cost of production is offset by the smaller mounting costs of the smaller area of panels needed.

Further work needed, and so more research essential.
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adam2
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PostPosted: Wed May 18, 2016 9:39 am    Post subject: Reply with quote

Agree, this technology shows promise for those relatively rare situations where the most KW from a restricted area is needed.

More typically, plenty of space is available and the requirement is the most KW from say £1,000.
Most UK PV installations are limited by either the available money, or by the limited energy that may be backfed into the grid.
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biffvernon



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PostPosted: Wed May 18, 2016 11:25 am    Post subject: Reply with quote

Yes and price per kW is falling and falling faster than most folk guessed a decade ago. Efficiency has been creeping up at the same time and while W/£is more important than W/area, the extra efficiency will help.

When I bought my ~4kW system it was the maximum output I could fit on the roof but well before the panels degrade enough to have to be scrapped, maybe in two or three decades, replacements will be available at double or more the output. There may come a time when a decision to abandon sunk costs are scrap and replace becomes the sensible option.
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clv101
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PostPosted: Wed May 18, 2016 1:55 pm    Post subject: Reply with quote

I tend not to get excited about area efficiency. We are many orders of magnitude away from running in to solar space constraints. Whilst some folk might grip about their roof being full... there are many many empty roofs, let alone golf courses.
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biffvernon



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PostPosted: Wed May 18, 2016 2:14 pm    Post subject: Reply with quote

Indeed, but that's no reason to not have efficient stuff, other things being equal. Once the R&D is done there may be no downside to a more efficient device.
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woodburner



Joined: 06 Apr 2009
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PostPosted: Wed May 18, 2016 6:11 pm    Post subject: Reply with quote

biffvernon wrote:
Once the R&D is done there may be no downside to a more efficient device.


Take off the rosy specs. There has never been anything that has an advantage with some associated disadvantage.
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