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Posted by busdweller on March 29, 2009, 12:47 pm
 
Hi Kids

I can only assume that having lens or mirrors reflecting /
concentrating sunlight more than 1,000 times would generate more power
but most likely shorten the life of the panels. A bunch of years ago I
messed with a half a dozen 51 watt kyocera panels and a few big
mirrors that I picked up at the landfill and over a couple years 2 or
3 of the panels turned to a light brown tint. They still generate good
power good but I think the extra heat and or  concentrated light
messed with silicon in some way. I ended up taking them off after
that. I have a couple of bigger system now with power point
controllers and I just dont use a lot of power anyway. I still use
those 6 Kyocera panels and 6 others on a small system that runs a
small work shop and they work fine. Those panels were manufactured in
1992. Any way I just thought Id put that out there.

Peace along the way
Dennis the bus dweller N.Y.



Posted by Eeyore on March 29, 2009, 3:51 pm
 


busdweller wrote:


Probably melt them actually. Silicon as used in semiconductors stops being a
semiconductor at about 200C when intrinsic conduction takes over from extrinsic
conduction.

In any case, the PV panels lose efficiency as they get gotter, so the entire idea
is counter productive.

These are the temps you get when you concentrate sunlight/
http://en.wikipedia.org/wiki/PS10_solar_power_tower

Graham


Posted by Eeyore on March 29, 2009, 3:55 pm
 

Eeyore wrote:


idea

Strangely I don't see a figure there but 420C comes to mind from somewhere else.
Enough to produce high pressure steam for sure to run the turbines.

Graham


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