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RE: ao40 power



There is no such thing as a "perfect" constant current source.
The solar cells have internal resistance and the higher the current
the great the voltage drop in the arrays themselves and that is
going into space as radiated heat and useless to us.


Bob
N4HY

-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of wa6fwf
Sent: Monday, February 02, 2004 1:20 AM
To: Mike Murphree
Cc: amsat-bb
Subject: Re: [amsat-bb] ao40 power


On Sunday 01 February 2004 16:22, Mike Murphree wrote:
snip
>
> But the dissipation among the cells is not constant.  Shorted cells
> will dissipate far less than the good cells....    Volts X Current =
> Watts (Dissipation)
>
> 73
> Mike W4LNA
>

  Hi Mike,
 true... shorted cells will not dissipate power... but solar panels are a
constant current source... not constant voltage...
   so if all cells shorted but one... you would have 1.4volts at 6 amps and
you would be back to 8.4 watts again...

73
Kevin wa6fwf

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