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Project "Real battery charger"
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[QUOTE="Charles, post: 30087, member: 103"] It applies perfectly. Only disparity is energy lost to heat/sound and the rest. Your calculation is at 100% efficiency. Regardless, it will take a substantial motor to drive that alternator. 4+hp as you showed. And at 110 volts, it would take a little over 25amps at 100% efficiency. As far as required rpm, just look at the ratio in dia of the crank pulley to the alternator pulley on the truck and figure 1000 engine rpm before the alternator is capable of maximum amperage on these trucks and calculating the necessary alternator rpm should be a cinch. And yes.... if this is done it should most certainly include at least one battery that stays with the alternator on a roller cart to act as a damper to the alternator, and also provide the field voltage for that alternator. Otherwise connecting the alternator straight to a dead vehicle with multiple dead batteries with no fresh battery of its own is going to load the sh*t out of it. Plus, without a battery of it's own, something like an accidental short by touching the cable ends together or similar would pop the alternator. [/QUOTE]
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