Joe said:

Here's the schematic, if you want to have a think now

http://home.clear.net.nz/pages/joecolquitt/SC_MPPT_0312_03.jpg

As you can see, there are various values changed in the circuit for
the 12V or 24V options. I'm sure fairly simple mods can be made
for 66V. Operation is mostly the relationship between AN0 and

____________________

Yes. Adjust input resistors to produce 2.18V on pin 3 of IC2a when panel is
at V_max_power.
Ensue ratings of D1 and Q1 are OK for Vin max O/C and ensure all components
on hot side (left) of Q1 never experience excessive voltages for their
rating.

If you wanted to produce a minimalist quasi MPPT controller you could
eliminate the microcontroller and just use the panel voltage divider and
TL499A buck conveter to hold the panel at Vmp.


R
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