Quote:
Originally Posted by lostdaytomorrow
All future new guys reading this and thinking about buying a cap. to fix your bad voltage drops (Below 12v while car is running) or dimming headlights (common sign of non-adequate electrical system), keep in mind this will not help, and if it even seems to help (fixing your dimming headlights, which is not probable but stranger things have happened) it is not fixing the problem, but merely masking the problem. Your alternator is still being run full-bore at all times when the amp is drawing more current than the alternator can produce. Think of your car battery as a buffer and the alternator as the actual power source.
Yes, that is a very long sentence. Yes, caps can help with small voltage fluctuations. No, a cap should not be used instead of buying a high output alternator and deep cycle battery(ies).
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Actually, IF you design the circuit properly, a capacitor and inductor together IS PHYSICALLY POSSIBLE to get rid of a MOMENTARY "voltage drops".
And of course, if it's not properly designed, it can damage the original circuit from the car because of back EMF.
Just take a look at the "buck converter" circuit. through the voltage regulating part of the circuit is not related to this, but the "voltage and current smoothing " part of the circuit can prevent that "voltage drop".
However, it is not practical because a huge capacitor and inductor is needed.