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V/I for panels

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Posted by David Lesher on January 31, 2011, 9:21 pm
 

How much does the cell size vary over model/technology? I ask because I am
seeking
panels with more cells in series, to get higher voltages.


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Posted by Josepi on February 2, 2011, 12:00 am
 
None.

Shop for price and physical stability in construction, ease of mounting. and
voltage needed.
Thicker lines between the cells means less overall efficienciy due to less
PV area.




How much does the cell size vary over model/technology? I ask because I am
seeking
panels with more cells in series, to get higher voltages.


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Posted by stevey on February 2, 2011, 12:04 pm
 David,

Curious why you ask this question.  Most c-Si modules have pair of 36-
cell
strings, or one 72-cell string.  So you could get around 40V Voc.
   If you are handy or expert at de-soldering
and re-soldering on a solar module, you could reconfigure a solar
module
to one string, though not advisable.
Good Luck,



Posted by David Lesher on February 3, 2011, 4:08 am
 

Working on a system with lots of line between the panels and the
inverters. Hence lots of loss, and lots of $$$.

So 20KW @ 250V [i.e. 80A] will have more loss than 20KW of
panels at 550V. [36A]

Obviously the # of cells in series in an array determines the
output voltage.  But how much do different panel designs, and
different technologies, vary the available currect?



--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

Posted by Mauried on February 3, 2011, 10:20 pm
 On Thu, 3 Feb 2011 04:08:17 +0000 (UTC), David Lesher


Have a look at thin film amorphous panels like Kanekas.
Panel voltage is around 70V.
Insulation voltage is 1000V so you could wire them in series to get
500V+, or even 1000V .
Why dont you simply relocate the inverters to where the solar panels
are, rather than run long lengths of DC .


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