I agree 72Sonett. In less technical terms... - Saab Sonett Bulletin Board - Saabnet.com
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I agree 72Sonett. In less technical terms...
Posted by Chaz [Email] (more from Chaz) on Mon, 3 Apr 2006 13:28:56
In Reply to: I don't think you know a lot about battery chargers, 72saabsonett [Profile/Gallery]
, Fri, 31 Mar 2006 02:41:29
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...the regulator keeps voltage steady. Any current draw, such as radio, lights, etc... will create demand. A larger alternator will be able to supply that demand. A lesser alternator will hit a wall. There is no matching a battery to a charging system here, just V=IR. (Please excuse the caps).
Voltage is held constant (roughly) by the regulator. If a switch is openned it creates a parallel circuit that drops resistance. Voltage is held constant, so the alternator then needs to supply more amperage to make up for it. A larger alternator does this by having more coils available in the stator. A dead battery has a lesser voltage, so it cannot resist the alternator. As it charges, it will accept less and less current. (It will always accept some current given the battery is 12 volts, and the alternator is 13-14.5 volts.) This means a larger alternator with properly functioning regulator will only supply what is needed, nothing more. V=IR.
Given the electrical system can supply hundreds of cranking amps, (double to quadruple what an alternator can supply), I am unsure what you are refering to when you state we need to match batteries to alternators to prevent damage. The thinner plates are meant to increase surface area in order to increase available cranking amps.
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