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    Icon11 The truth about capacitors?

    Does anyone have a link to what caps actually do? I'm in a discussion about caps in a private forum and someone wants to buy one. I told him not to get one because they're useless and save up for an HO alternator instead. So why exactly are capacitors not good? and why do 'high end' systems have them?







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    Re: The truth about capacitors?

    Quote Originally Posted by teqnek
    and why do 'high end' systems have them?
    Typically just for show. If you are talking about "high end" competitor systems, then typically they are sponsored and part of the agreement is to have them physically in the car. Funny part is, a lot of the times in situations like that, the cap isn't even hooked up

    Anyways, do a search for the topic, there is more than enough out there about it already.




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    Re: The truth about capacitors?

    ya, ive already done searches on them, but i couldn't find a legit reason why they're not good. all ive read was 'dont one b/c they ****' or 'leave it out and get a better alt'




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    Re: The truth about capacitors?

    Look a little harder, I have gone through the theory of it a cpl times lately.




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    Re: The truth about capacitors?

    There is some decent information/explanations in the new Zed Amplifiers owners manual, a copy of which is located here ---> http://www.jackess.com/zedmanual.pdf


    Keep in mind of course, this explanation is given with their new amps in mind, but it can also be applied to other amps, depending on if they are regulated or unregulated power supplies.
    Last edited by Ne1; 01-19-2005 at 01:39 PM. Reason: I R teh leet speller




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    Re: The truth about capacitors?

    Well I don't really have a clear answer as to why so this is just my little theory.

    But supposedly keeping the battery and capacitor charged puts more strain on your alternator than just keeping your battery charged. caps are like an extra 'battery' so they have to be charged also, therefore putting your alternator to more work.

    anyone know if i'm close?



    back at it...

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    Re: The truth about capacitors?

    Quote Originally Posted by skeptikal
    Well I don't really have a clear answer as to why so this is just my little theory.

    But supposedly keeping the battery and capacitor charged puts more strain on your alternator than just keeping your battery charged. caps are like an extra 'battery' so they have to be charged also, therefore putting your alternator to more work.

    anyone know if i'm close?
    That's pretty much the main gist of it. The cap becomes another load for the alternator to charge (along with the battery). The more things in the path taking power away for recharging is less power your amps are receiving.




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    Re: The truth about capacitors?

    Also, 99% of the capacitors out there are designed with very high ESR/ESL ratings, which is like filling a tin can with mud and throwing them in the eletrical circuit.




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    Re: The truth about capacitors?

    i mean SPL comp use them. THey have a purpose there. But some daliy ppl they sux.


    But i have one ? What if light are not dimming and want to add one. That should be an big help. RIGHT???



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    Re: The truth about capacitors?

    Quote Originally Posted by LBX2G
    i mean SPL comp use them. THey have a purpose there. But some daliy ppl they sux.
    No they don't, ask any top competitor and they will tell you the same. I have a cpl friends that have actually lost output from adding a cap.

    Quote Originally Posted by LBX2G
    But i have one ? What if light are not dimming and want to add one. That should be an big help. RIGHT???
    Nope, actually will make it worse. Upgrade the big 3, get a better battery and then upgrade the alternator.




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    Re: The truth about capacitors?

    now let's say i have alt upgrade, then i have the alumapro 5 farad cap bank. I mean my light are not dimming at it is. It should help since it is not happening.


    BUt about the comp thing. well I guess this must have just started happening cus heard caps only really serve a purppose in the spl COMP world. But i guess I am wrong.



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    Icon33 Re: The truth about capacitors?

    k...one more time for the slow kids...
    the ALTERNATOR ''does not charge the capacitor!''
    DOES NOT.......
    unless your cap is over 4.5 or 5....
    your cap takes a tiny bit from your battery.....
    i guess just a 2 cap might run a battery down over 30 yrs of use if no charging.......
    i should say if you use your stereo everyday for over an hour over 90%up it might run the battery down faster...
    ---i would not use a 5 cap.that will mess you up..what on earth do you need a 5 cap for? you using over 2700rms??
    id say around theres the max for a 5 cap.....
    Last edited by profilepower; 01-19-2005 at 03:48 PM.




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    Re: The truth about capacitors?

    Yup, as stated above:

    A cap is a band-aid for a weak electrical system. It adds ANOTHER load on an already strained alternator (alt has to charge batt, run car electronics...and then "refill" the cap).

    A cap is like a cup, fill with water (think of the water as electrical storage). The alternator is a water pump. The alternator has to refill the cup everytime the amps drink the water. So, it adds more strain on the alternator.

    Without a cap, the alternator pumps water to the car's electronical needs and amplifiers. If the alternator is overloaded, it dips into the battery for reserves. Then when it isn't overloaded, it takes over again. The cap can handle a short second burst, but long drawn out bass, the alt is trying to refill the cap, charge the batt, and run the car's electronics.

    I essence, first to the big three. (Use 1/0 awg wire from alt to batt +, batt - to chassis ground, and batt - to engine block ground. Then next step is replace stock battery with a deep cycle battery (yellow top/ blue top...i recommend blue!). Then if you have the money, replace stock alternator with a quality High output (HO) alternator. Check out www.mean-green.com or www.excessiveamperage.com Then is needed, add a second deep cycle battery. peace

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    Re: The truth about capacitors?

    u know *** it get a batcap and call it a day.



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    Re: The truth about capacitors?

    Quote Originally Posted by profilepower
    k...one more time for the slow kids...
    the ALTERNATOR ''does not charge the capacitor!''
    DOES NOT.......
    that's wrong

    when the car's running the alternator is the highest voltage source - it charges, or tries to charge everything in the car until voltage is equal, and yes, that includes the cap. Caps charge quickly, so it's not a long term drain to the alt, but they also DIScharge quickly and need to be charged again.

    IN a nutshell - a cap decreases voltage sags, but it also decreases voltage peaks - considering those two characteristics it's not hard to understand why dimming can be reduced in some cases (which it can). The gap between voltage peaks and valleys is lessened, so the corresponding gap of dimming headlights is reduced as well.

    However - if you take long term rms voltage readings of a properly installed system - one capped, one not. The one w/o the cap will always be higher, maybe only slightly, but higher nonetheless.



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