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You can use a 24 to 12 converter to power things directly, but they would not do so well to maintain a battery. Ideally, a battery should be brought to around 14.5v, held there for 30 min or until the amperage draw is fairly low to be fully charged. Then the voltage can be dropped back to...

If you don't go with a 12v alternator, you could also get a solar charge controller and feed it the 24v from the original alternator. The charge controller has to be the pulse width modulated type (rapid on-off), and not the shunt type (designed to short out the solar panel to control voltage)...