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Thread: Solar Panels? - Why PWM Works
www.piclist.com/techref/io/pwm/index.htm?key=pwm
picon face BY : Eric Borcherding email (remove spam text)



Wagner,

A solar panel power delivery can be likened to a Low pass Bode plot.
It you unload the cells they tend to rise in voltage - it is a natural
physical
response from being srtuck by light.   So, at this point the Array voltage
rises
and there is an effective higher voltage output.  As you load this with a
circuit
the draws power the array voltages drops again.   But if you pulse load this
then
the average voltage delivered is some higher.   The regulation unit must look
for
the maximum product of V panel to I delivered to battery / load.  It now is a
simple
proportional drive to track a hi - right on - low point that allows the
maximum
power to be tracked and delivered.   There is a need to understand that PV
cells
are not linear they a bowed - the V*I max in the bow can be tracked.   I have
PVs on my roof and collect 1/3 of all my electrical needs.   If I can help
folks
witht his write...  Trace Engineering makes some nice $value products...

Eric Borcherding

<360e48a0.36e3773b@aol.com> 7bit

See also: www.piclist.com/techref/io/pwm/index.htm?key=pwm
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