A deep cycle battery would work. But your vehicle would have to run for an extended time just to recover a charge. Example. 800 amp deep cycle at half capacity plus the load from accessories and not to forget the cars primary battery. Common alt. 70 - 90 amps. At roughly 1200 to 2200 rpm's.
I know there is a calucation to do this.
If u independently kept the deep cycle on a 5-10 amp charger at night. I could see this working.
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