Anonymous asked in Cars & TransportationCar Audio · 1 decade ago

can i hook a deep cycle battery up to a regular car battery for my sound system?

i have a hifonics brutus amp to power my 2 15" inch olympus subs and i need to hook another battery up to power the beasts lol. the guy gave me his yellow top optima with the system but i dont know if it will charge right with my car battery.



i have a 08 mustang gt500

3 Answers

  • Anonymous
    1 decade ago
    Favorite Answer

    If your total system power is 1200 watts RMS or more, you will need to:

    1. Upgrade the alternator to a high output alternator

    2. Upgrade to a yellow top battery

    3. Upgrade the "Big 3" - that is to replace (or add to) the power wire between the battery and alternator, the ground from the battery to the chassis and the ground strap from the engine/tranny to the chassis with at least 2 AWG wire.

    Failure to do this will result in the early death of the alternator as it will eventually fail.

    Here is a guide that will calculate what size alternator and power wires you need

    You will need Microsoft Excel. If you don't have Excel, use this link

    A second battery is never a good idea as it's an added strain on the alternator to charge two batteries AND supply power for the car. The ONLY time a second battery is useful is if the audio system is to be used with the car off.

    A capacitor is only good so far as the audio system isn't trying to pull too much from the electrical system. A cap doesn't provide more power, it's designed to 'stiffen' the voltage to the amp, nothing else. If the current isn't there, a cap won't help.

    The alternator must have at least 20% more amperage power than the entire vehicle and sound system combined for a cap to be of benefit which is ironically the same requirements for an amp to be efficient.

    See my site for more info

    Source(s): A.A.S. degree in Electronics/Industrial Electronics with 25 years in the mobile audio/consumer electronics field
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  • 1 decade ago

    What jeremy said is correct, you can also hook up an isolater so when one battery is charged, the car will run off that while charging the other battery.Ive done this to a couple cars. Imo I would more then likely hooked the amp up to the Optima yellow top, mainly it being a deep cycle itll handle the voltage drops better.

    The GT500 should have a strong enough alternator to handle a dual battery load, you might even be fine with just hooking up the yellow top then see if a second battery will be needed. Now that i see what you drive, Id take those woofers out and throw a bottle back there haha. Good luck with the install.

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  • 1 decade ago

    You can hook up another battery. Make sure to put a fuse between the batteries and between the second battery and the amp.How long your alternator will last depends on what kind of vehicle you have. The real fix is a high output alternator. What kind of vehicle do you have?

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