12v / 24 v altinator

Elja Röllinghoff Balu SM 222

He all 
 ever thought about switching the 12-V altinator  to charge the launch battery for a 24-ounce and using the service batteries to speed up the charges. If we're charging the launch battery, we'd have a battery charger
Battery used to battery 24-12 V.
can and should do something like that would be against it?
 thanks Elja
SM Baloo 222

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