Russell,

On Sun, 03 Sep 2006 14:38:52 +1200, Russell McMahon wrote:

> > Here is a charger idea that is interesting:
> >
> > http://www.tunecharger.com/
> 
> Not overly cheap.
> PIC16F675 based boost converter
> Circuit on page 10.
> 
>         http://www.tunecharger.com/2006_t_0001_mtc_3-330.2%20%20reva%20technical%20reference%20manual.pdf.

By a strange coincidence I found the above recently (have you been hacking my gargoyle [tm] searches? :-)  

It is interesting, but it's too puny for what I need: 24V battery system (so open-circuit voltage of solar array will be up in the 30s), at least 10A 
charging current - preferably more.  I did wonder about scaling this up, but a number of the components are something of a mystery to me - 
especially the MOSFET driver chip - not sure how its characteristics affect the specs for the whole unit.  Obviously the 7805 is the first thing that 
won't stand 30V+ across it, but which components result in the 10W power limit I don't know.  It's all a but non-digital, an area in which I am never 
comfortable! :-)

Cheers,


Howard Winter
St.Albans, England


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