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Re: Re: Re: Re: 24 volts down to 12 volts.
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Posted by MarkB on July 04, 2000 at 03:27:11 from (198.110.22.248):
In Reply to: Re: Re: Re: 24 volts down to 12 volts. posted by Paul on July 03, 2000 at 05:47:39:
The reason that one battery will get overcharged and the other will get undercharged is that the charging current through the two batteries is not the same. (Kirchoff's Current Law.) Let's say that your charging current is 10 amps and the headlights draw 5 amps. The battery that isn't connected to the lamps will get the full 10 amps, while the battery connected to the lamps will only get 5 amps. The result over time is that the first battery will get overcharged and the second battery will get undercharged. The generator output is a fairly constant 28 volts. As the voltage across the overcharged battery rises, the voltage across the undercharged battery must drop (Kirchoff's Voltage Law). At some point in time, the overcharged battery will rise above 16 volts, and the undercharged battery will drop below 12 volts. The undercharged battery will stop charging at this point and will eventually go dead. I experienced this phenomena first-hand in a JD 5010 with a 24 volt system. This was many years ago before I learned Kirchoff's Laws.
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