Posted by coj on July 14, 2009, 8:07 am
LU Wei wrote:
If you've increased the reflectivity to change the colour of a cell then
it will lead to a drop in current in a cell and also a module. You might
get a slight encapsulation drop when laminating the module but you won't
get an extra reflectivity drop. Your new module power should be close to
the ratio of your cell efficiencies 16.5/16.9.
Posted by LU Wei on July 15, 2009, 3:19 am
coj wrote on 2009-7-14 16:07:
It will not be the case because there is a match problem between the SiN
coating and laminate coating. The reflectivity ratio of gold and blue
cell may be 16.5/16.9 (if we omit other factors), but the reflectivity
ratio of gold and black module will surely be less than that.
Posted by LU Wei on July 15, 2009, 6:26 am
LU Wei wrote on 2009-7-15 11:19:
Sorry for my mistake: the reflectivity ratio should be 16.5/16.9 +
(1-16.5/16.9)/0.05 ~= 1.45 (if we let the reflectivity of blue cell to
And the reflectivity ratio of gold and black module will surely be
higher than that (greater than 1, anyway).
Posted by Doc O'Leary on July 14, 2009, 4:20 pm
Keep in mind that there is even potential to use the reflected light for
solar thermal in a hybrid system. If it's not diffuse reflection, I
could easily see making a fresnel mirror out of gold panels. Heck, it
might even be worth more significant drops in PV efficiency if you could
put out silver panels!
My personal UDP list: 127.0.0.1, localhost, googlegroups.com, ono.com,
and probably your server, too.
Posted by LU Wei on July 15, 2009, 3:25 am
Doc O'Leary wrote on 2009-7-15 0:20:
Your suggestion of hybrid system is valuable yet I think we still have
no R&D ability and investment in this area. Anyway, silver panel is not
practical -- it will reflect too much light!