Can a 12V DC Motor Efficiently Power a 120 Amps Alternator at 2100 RPM?

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SUMMARY

Using a 12V DC motor to power a 120 amps alternator at 2100 RPM is feasible, provided the motor is approximately 20% larger than the alternator to compensate for inefficiencies. Specifically, a motor rated at 150 amps and 1800 watts is recommended for optimal performance. This setup involves converting 12V DC to 12V AC, resulting in a 20% energy loss during the process. Understanding these specifications is crucial for effective implementation.

PREREQUISITES
  • Understanding of 12V DC motor specifications
  • Knowledge of alternator operation and ratings
  • Familiarity with electrical efficiency and power loss calculations
  • Basic principles of AC and DC power conversion
NEXT STEPS
  • Research 12V DC motor specifications and selection criteria
  • Learn about alternator efficiency and performance metrics
  • Explore methods for minimizing power loss in electrical systems
  • Investigate the principles of DC to AC conversion techniques
USEFUL FOR

Electrical engineers, automotive technicians, and hobbyists interested in alternative energy systems or motor-alternator configurations will benefit from this discussion.

bikram
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Is it possible/meaningful to use a 12V DC motor to run a 120 amps. Alternator at 2100 rpm ? If yes, what kind of DC Motor should be used (RPM/Watts/HorsePower)
 
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Sure it is possible, but I don't know why you would do it. The motor just needs to be about 20% larger than the alternator to account for inefficiency losses. You didn't say what the voltage of the alternator was, but if it is a 120 A, 12V AC alternator, then what you are doing is converting 12V DC to 12V AC with a 20% loss. So figure on a 150A motor to run it (1800W).
 

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