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Re: Re: Re: Re: Re: Re: To Settle an Argument
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Posted by ltf in nc on August 27, 2000 at 21:00:53 from (206.228.215.164):
In Reply to: Re: Re: Re: Re: Re: To Settle an Argument posted by Wardner on August 27, 2000 at 19:59:20:
Wardner, remember that the starter which is a dc electric motor will attempt to deliver the designed horsepower by, as in the example, consuming 746 watts, even at the expense of self destructing. If the battery was weak, with a voltmeter it would still read near 12 volts and would still light a small 12 bulb for some duration. However, with it undercharged, the ability to deliver the amperage for a sustainable period is nonexistant. This does not mean that the battery was of insufficint amperage but that it may just be undercharged. If the voltage drops to 10 volts during the crank cycle the ampereage would have to rise to 74.6 amps to deliver the 746 watts. The design of the battery is to develop approximately 1 1/2 volts per cell and the amperage per cell can vary due to the material makeup of the cell itself. In the discussion that generated this question initially, the better answer might be that the bad battery was incapable of developing the wattage required. The battery , when charged, most likely would have cranked the device. The undercharged battery lacked the current delivering capability to generate the wattage required to drive the starter. It is for this reason that I always buy the largest amperage battery that will fit the battery compartment of the vehicle. Cheap batteries from discount stores, often with labels that overstate their capacity, are in my opinion a major cause of starter failure. The wattage to drive the starter is marginal or is available only for short duration and the starter is not efficiently driven. When an undercharged or too low amp battery is connected to a starter the starter tries to delivery the horsepower required. Since the supply is inadequate, the current rises to the maximum available and the voltage will drop. This places more amps across the starter relay and starter brushes creating heat and still starves the starter for wattage. Again the example.... 12 volts to deliver 746 watts equals 62.17 amps required...if the voltage drops to 9 volts inorder to deliver 746 watts equals 82.89amps. This would exceed the ideal design amps by 33%.
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