From my charging systems days, a 62A alt at full output, 5000 shaft rpm, output is 1.16 Hp (as before 62 x 14v = 868 W / 746 = 1.16 Hp out. This will require approx 3 Hp to drive, including waste heat, friction and fan loading. (From actual testing).
So the 50% efficiency number is very close.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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