There were recent discussions involving car alternators & at one stage
I came across a site where a guy was using a car alternator to
generate 120V DC.
The only change he claimed IIRC was to modify (drastically) the control circuit.
If your alternator has an accessible controller, it may be feasible to
modify it to produce the 24+ volts required. Insultion requirements
would not be different for the 2 voltages as they are both so low so
it could be pretty straightforward.

If you can locate the part of the circuit that senses the output
voltage, it almost certainly invoves a voltage divider or zener.
Changing components at this point may be all that is required.

At your own risk of course!

RP

On 17/03/06, Padu <padu@merlotti.com> wrote:
> From: "David VanHorn" <dvanhorn@microbrix.com>
>
>
> > If you have a 12V alternator, you really need to use 12V battery.
> > The alternator isn't guaranteed to give you a stable output without the
> > battery present for one thing, and there's no easy way to get from 12V to
> > 24V at that current level.
>
>
> Well, they are 12V batteries, but I want to connect them in series. Can I
> use the output of one of the batteries (12V) to power up the alternator
> field?
>
> Cheers
>
> Padu
>
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