Originally Posted by BriEOD
Nice thread Diesel. Very detailed. My only concern is what effect will this cause on your alternator. I'm not an EE, but what do you think is the minimum amperage alternator you could safely use with this? Obviously, by putting the batteries in parallel you are charging both simultaneously and you have doubled the demand on the alternator.
Theoretically it should not matter nor harm the alternator. The alternator only sees one large battery when the relay is energized. As a result it will have to run longer to bring the system up to a full charge. Any amp alternator will work but a higher amp alternator will charge the system faster, thus work less.
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