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40%+ PV Efficiency...?

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Posted by john on July 13, 2008, 2:47 pm
 
I keep getting Google hits on 40% PV efficiency technology, has this
stuff hit the market yet?

These PV things fascinate the heck out of me, but from what I keep
reading in this forum, they are just not quite ready for prime time
unless in an area w/o power grid service... although a 40% cell ma level
the field a bit.

Any body's crystal ball working...?  Just wondering what is "coming soon"?

Thanks
John

Posted by Martin Riddle on July 13, 2008, 4:34 pm
 

|I keep getting Google hits on 40% PV efficiency technology, has this
| stuff hit the market yet?
|
| These PV things fascinate the heck out of me, but from what I keep
| reading in this forum, they are just not quite ready for prime time
| unless in an area w/o power grid service... although a 40% cell ma level
| the field a bit.
|
| Any body's crystal ball working...?  Just wondering what is "coming soon"?
|
| Thanks
| John

Usually the top performers are for space use, top $$$.

Cheers



Posted by Eeyore on July 13, 2008, 5:37 pm
 

john wrote:


I believe Boeing's (Spectrasonic ?)  made such panels but they are so
expensive thar they are never likely to see use outside space applications.

Graham


Posted by coj on July 13, 2008, 9:32 pm
 Eeyore wrote:

It's Spectrolab

The best they do for space cells is around 29% for a triple junction
http://www.spectrolab.com/DataSheets/NeXtTJ/nxttj.pdf

Their highest efficiency is for terrestrial concentrator up to about 38%
http://www.spectrolab.com/DataSheets/TerCel/C1MJ_CDO-225-IC.pdf

For space cells they need to be radiation hard and cope with extremes of
temperature, the spectrum is always AM0

For concentrators they will have more grid fingers and need good thermal
bonding to a heat sink plus cope with varying spectra (or spectrums ?)

They are likely to be extremely expensive, much more than a conventional
18% cell would cost.

--
coj

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