Re: Electrical dummy

Posted by John T on January 30, 2007 at 19:55:03 from (66.244.90.5):

In Reply to: Electrical dummy posted by B-maniac on January 30, 2007 at 14:59:03:

B Maniac, You have to be careful when you start tossing out terms like power and amps and energy too loose. A battery is an energy storage device and its energy gets expended in the form of Volts x Amps over Time. The CCA rating is a measure of amps a battery can supply for a certain time before its voltage drops to a specified level.

Sooooo if a 6 volt (3 cell) battery can deliver say 500 amps for a certain time, the energy is 6 volts x 500 amps over x amount of seconds BUTTTTTTTTTT if a 12 volt (6 cell) battery has the same amp rating, it can supply twice as many volts x 500 amps over x seconds.

Due to ohms law if you apply 12 volts to a load instead of only 6 volts, the current is doubled, and at twice the voltage and twice the current youre obviously supplying and expending more energy into the starter then if you used a 6 volt battery, n YES shes gonna crank over faster DUHHHHHHHH Soooooo its NOT true that a 500 CCA 6 volt battery is gonna make the starter perform the same as a 500 CCA 12 volt battery. Its true that 500 CCA = 500 CCA but 500 CCA at 6 volts IS NOT THE SAME as 500 CCA at 12 volts.

The other thing to note if using two batteries is in series the amperageg rating is NOT increased while the voltage is additive. However, in paralell the amperage rating is addtive while the voltage stays the same.

That all being said, on a 6 volt tractor I recommend the heaviest rated super duty 6 volt battery that will physically fit into the compartment and use 00 gauge battery n starter n ground cables for better cranking. If one insists on converting from 6 to 12 volts the old 6 volt starter can be used n YES it does indeed crank over faster.

Hope this helps best wishes n God Bless

John T Retired Electrical Engineer in Indiana

Replies:

• Re: Electrical dummy B-maniac 19:18:59 01/31/07 (0)

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