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<blockquote data-quote="MECHMAN" data-source="post: 4852933" data-attributes="member: 595065">Most of your low cost alternators only change out the Stator to increase output.&nbsp; This increases the high RPM output, but decreases the low RPM output.&nbsp; In order to bring the low RPM output, a custom rotor needs to be used, and then a custom regulator has to be designed to handle the additional amp draw of the rotor.&nbsp; (which isn&#039;t cheap)Low RPM output is what the extra money gets you.Also, figure aprox. 80 amps draw for every 1000 watts RMS at full volume.&nbsp; Figure 50-60 amps to power the vehicle with all the lights and AC on.&nbsp; Finnally figure that no alternator puts out full output at idle.&nbsp; If you want to engineer the charging system to last, the alternaotor&#039;s idle output should equal the full draw of the stock vehicle + amplifiers.With today&#039;s audio systems, it is almost impossible to have enough alternator, which is why people suplement with batteries.</blockquote>

[QUOTE="MECHMAN, post: 4852933, member: 595065"] Most of your low cost alternators only change out the Stator to increase output. This increases the high RPM output, but decreases the low RPM output. In order to bring the low RPM output, a custom rotor needs to be used, and then a custom regulator has to be designed to handle the additional amp draw of the rotor. (which isn't cheap) Low RPM output is what the extra money gets you. Also, figure aprox. 80 amps draw for every 1000 watts RMS at full volume. Figure 50-60 amps to power the vehicle with all the lights and AC on. Finnally figure that no alternator puts out full output at idle. If you want to engineer the charging system to last, the alternaotor's idle output should equal the full draw of the stock vehicle + amplifiers. With today's audio systems, it is almost impossible to have enough alternator, which is why people suplement with batteries. [/QUOTE]

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