Roman Black wrote:
...
> In that case you may be better wiring the panel as
> series, about 3 times higher V than your battery and
> using something like my 2-transistor Black regulator
> to do your current conversion. That would give much
> of the benefit of MPPT, ie lower current load on the
> panel, current transformation and also provide useful
> power in low light conditions.
...

   In that case why not replace zener ZD1 in your regulator
with resistor equal to R1, for example. So the regulator
will try to eat as much current as needed to maintain at his
input double accumulator battery voltage. If we choose
panels to produce double * double (i.e. four times without
load and at full sun) accumulator battery voltage, then, I
think, it would be a rather efficient system: The regulator
will self-adjust to have a half of a circuit resistance in a
wide range of Solar insolation.

   Correct me if I'm wrong, please.

   Mike.
---------------
P.S. Some capacitor is needed on regulator's input.

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