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V/I for panels - Page 2

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Posted by David Lesher on February 4, 2011, 1:34 am
 
mauried@tpg.com.au (Mauried) writes:




Thanks; will do.


Costs of stepup xfmr to 4160, MV cable to house and stepdown again.

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Posted by Josepi on February 4, 2011, 3:04 am
 
Panels range from a few watts to the typically largest 235 watts for
residential usage.
The voltage is 12, 24 or 48 volt base (Usually about 150%) and you just put
more in series to get the system voltage you want. As long as the impedance
(same silicon style and capacity) match that works fine. Different banks can
be put in parallel to get current capacity up as they are considered
constant current devices and will not "fight" each other...generally through
fused branch circuits to avoid fires if a short occured



Many run high voltage systems and the inversion is a simpler and cheaper
circuit as no large  transformation is required, providing you are not
running a battery energy storage system, at that high voltage, too.

The line losses become insignificant and most with any size of power run 48
volt systems, with batteries, or higher without, partly due to eliminating
the losses. The 120KW system across the street runs co-gen inverters under
the panels on the rooftop and are all adressed by a communications bus that
displays and controls the individual co-gen circuit banks connected to the
grid.  I am not sure how they are gang connected...probably a multiply fused
splitter / switch / isolation box.





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?





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