Some of this is fresh on mind since there's a battery issue I'm trying do deal with right now.
I've got a small diesel 4WD motorhome. Two FLA 12 volt starting batteries (in parallel), and two FLA 6 volt deep-cycle batteries (in series). All get charged by the single engine-driven Delco 12SI alternator. My problem is - Delco alternator does not charge at a high-enough voltage so the two deep-cycle batteries ever get past 90% full. And, if I stick in a higher voltage regulator, it will be a bit too much for standard starting batteries. Standard Delco USA reg is set at 13.8 volts. European is higher. The deep cycle batteries need a 14.2 volt regulator to get fully charged. Thus the problem.
Big boats typically have the same problem and they use a "battery to battery" charger. It allows one alternator to charge two separate sets of batteries at two different voltages. Just what I need, but way too expensive. Good example of where just a few tenths of a volt makes a difference.
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