Car sub capacitors. good or bad for alternator/battery?

Question

i have heard both sides. i need a professional opinion.

Answer 1

1st- upgrade your wires

2nd- get larger alternator

3rd- extra deep cell battery or cap

Most cars come from the factory with a charging system that is adequate for the vehicle's stock equipment — air conditioner, power windows, defogger, etc — and can provide a modest amount of extra capacity (30-40%). Note that bigger vehicles like SUVs and large pickup trucks usually have larger alternators that can handle an additional 30 amperes of draw. However, if you drive a small car, adding 36 additional amperes of current draw to a system that produces only about 60 amperes of current could be a significant extra burden, one that your stock electrical system might not be equipped to handle.

When the engine is running, the alternator charges the battery and powers the accessories. As long as the accessories' current draw does not exceed the alternator's charging capacity, the battery does not supply current.

A high-powered audio system can draw more current than the alternator is capable of producing. At this point, current flows from both the alternator and the battery to supply the vehicle's accessories and the audio system.

The easiest and fastest way to boost your electrical system is to install a larger battery. This solution is only recommended if you need only 10 or so amperes of current. Adding a current draw of more than 10 amperes will often weaken your battery quickly and could leave you stranded somewhere.

If your new sound system creates a significant additional electrical burden on your car, then you can consider adding a second battery to your car. Many car audio experts don't recommend a second battery because two batteries create stress for the alternator and raise other complex electrical issues. There's also the question of safety. Batteries that are not properly ventilated can be dangerous. If you're thinking of adding a second battery, talk to a professional 12-volt installer first.

A capacitor stores electrical voltage and releases it as needed. Capacitors are great if your electrical system is near its capacity and the music you are playing suddenly hits a thunderous, long bass note. A capacitor releases the needed power to meet the demand without stressing the system, then it recharges itself. There are also specially designed car batteries that work like capacitors; that is, they have standby power that can be released as needed.

Adding a second battery will increase the amount of time you can listen to the audio system with the engine off. When the engine is running, the secondary battery is an additional "load" for the alternator to charge.

Answer 2

car sub capacitors are bad for itself :-) It is not worth for the price.  It can help only a litle bit, because it keeps too small amount of power to help the system. It should keep the voltage in "one line" when powerful sub is working, but it cannot give enaugh power to do this. Its capacity is too small. To make it work, you need at least 100Farad of capacity to handle that huge power peaks. And after you figure it out, it still will not help you, because you need to do the same thing inside your amplyfier, which works on higher voltage. Yes. Your amplyfier and concrete amplyfying transistors are working with higher voltage. When transisor opens, the high power supply voltage drops down because of current load.  It shouldn't. so It should be high quality and it should be filtrated by capacitors - like people do on 12V "with car audio capacitor". The power supply inside your amp can drop this voltage even when your 12V is super stable because it can be weak. so f*ck car capacitors and buy high quality amp and good battery.

The problem is, that its problem to buy that high quality amps :D  i sow some of them inside. Mac Audio, Magnat, Rodek, all these known brands are not as good as it shoud. Poor low quality components inside :-(

and now your question:

In today's modern car NO. It has high power output alternator with output power regulator  which can handle some peaks and overload, so Only the problem, which can happen is, that you will have not enaugh of power. I cannot guarantee the car manufacturer quality, but i saw some Mitsubishi, renault, Honda, BMW alternators, and they can handle it easily without problems.

Answer 3

They're fine, I've had one as a part of my system twice. If anything they're better if you have a system that puts a huge strain on the battery (like if your lights dim when the bass hits).