Current produced by 3.5 L car engine

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Discussion Overview

The discussion revolves around determining the current output of a typical automobile engine, specifically focusing on the amperage generated by the alternator and the safe limits for drawing power from a car battery while the engine is running. The scope includes practical considerations for automotive electrical systems and potential risks associated with high current draws.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about how to determine the amperage generated by a typical automobile engine and the safe limits for drawing power from the battery.
  • Another participant suggests that the alternator likely has an output rating that could provide relevant information.
  • A different participant proposes checking the ammeter of a car that has one to get a rough idea of current usage, noting that headlamps are a significant drain.
  • Further elaboration indicates that modern automotive alternators are typically rated between 50 to 80 amps, but warns that drawing near maximum current for extended periods could damage the alternator and associated components.
  • There is a caution raised about the potential damage to a vehicle's electronics when drawing high instantaneous currents, particularly during transients.

Areas of Agreement / Disagreement

Participants express various viewpoints on the amperage ratings of alternators and the implications of drawing power from the battery, but no consensus is reached regarding the specifics of safe current limits or the best methods for measurement.

Contextual Notes

Limitations include the lack of specific alternator models referenced, potential variations in automotive electrical systems, and the need for more detailed specifications to fully understand safe current draw limits.

Gdarnall
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how can i determine how many amps are generated by a typical automobile engine? how many amps can i suck off of a car battery while the car is running, and not slowly drain the battery of its power?
 
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You might get a rough idea by looking at the ammeter of a car that has one. Headlamps are the largest drain, I believe.
 
Gdarnall said:
how can i determine how many amps are generated by a typical automobile engine? how many amps can i suck off of a car battery while the car is running, and not slowly drain the battery of its power?

Modern automotive alternators are commonly rated at least 50 to 80 amps however, they aren't intended to provide this range of current output for lengthy durations, so be mindful that you could end up damaging the alternator/rectifier/regulator if you intend to draw near max current for any extended durations. Even so, you should check the specs for your alternator's current output.

Additionally, if you're going to be drawing high instantaneous currents, transients can prove damaging to the vehicle's expensive electronics. Just keep that in mind...
 

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