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Thread: 2 battery's

  1. #1
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    2 battery's

    okay heres the deal, I have a mitsubishi lancer 03
    my stock alternator is around 85-90 amps
    I just recently purchased my second amp for the subs, a jbl 1201.1 on each kicker l7 12"... I was wandering if I was to purchase a optima yellow top battery and put it in the trunk for the audio system would I really notice much difference because im still only getting one source of power? also if this helps at all I also have a 2 farad cap... and if the battery does help would you guys recommend using an isolator since the deep cell wouldnt match the battery in the front of the car? also if you do recommend an isolator are there cheaper ones than 100$?

  2. #2
    Maximum Bitrate bratnetwork's Avatar
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    it will just take longer to drain the battery and your alternator will run all the time and break faster. You need to be able to produce as much power as you will consume on a regular basis. Batteries are basically for storing the power to start the car or to make up for times on higher consumption but if you have lets say a 90 amp alternator and your consistently drawing 120 amps adding a second battery won't over come that - just take longer to drain it. Capacitors are just to supply the amp with a large amount of power for a brief second at a time.

    You need to sit and calculate how much power you will be consuming then if its more than your alternator is putting out then you need to upgrade the alternator. A second battery on top of that doesn't hurt but isnt the solution.

  3. #3
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    Throw the capacitor in the garbage, it's been discussed many times before. If you need to upgrade the battery for your system, you need to do the alternator as well.
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    Calculate the total draw of the system. It needs to be in the 70 amp range or less because your car needs power for stuff like ignition, lights, fans, windows, whatever else you have in there. If you are doing more than 70 amps (somewhere north of 700 watts) then you need a high output alternator.
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    thanks alot guys for the fast replies. So instead of buying a optima yellow top, for now I should most likely buy a new alternator. since 3 amps in the car cant be powered to easily by a 90 amp alt. I have 2 jbl 1201.1 amps each with 3 30amp fuses. and a fosgate 400 watt amp. so the jbl's would be consuming 180amps of power? Also does anybody know a high output alternator site to direct me to. the ones I kept looking up were for refurbished ones of what I have...

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    I thought the purpose of caps was to help clean up the power eliminating spikes and drops in the supply, so why would you tell someone to remove it from the system?

    If I am incorrect in this can you direct me to some information please - could save me some money on my setup, cheers

  7. #7
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    Quote Originally Posted by captcol View Post
    I thought the purpose of caps was to help clean up the power eliminating spikes and drops in the supply, so why would you tell someone to remove it from the system?

    If I am incorrect in this can you direct me to some information please - could save me some money on my setup, cheers
    I'm too lazy to search myself so I'll just explain it again.

    Topic 1 - Battery / Alternator Upgrade
    All electrical in your car run off the battery and the battery is recharged as you drive by the alternator. If you have very few things running off the battery, the alternator is kind of sitting around bored because it doesn't have a hard job to recharge the battery. If you have a pounding stereo running off your battery, the alternator is being worked to death trying to recharge the battery as fast as it can. And if your system is using more than your stock alternator outputs (mine is 70 amps) then your alternator won't keep up, it'll burn out and your battery will drain leaving you with a dead alternator and dead battery.
    So you say you want to upgrade the battery but not the alternator. Then you have the exact same thing, your battery is going to have lots of power at first to power your system but again, if you're drawing more than stock amps (70 or so), then your alternator is going to burn out trying to keep this performance battery fully recharged all the time.
    Let's flip it and say you want to upgrade the alternator but not the battery like you just mentioned. Now your alternator is going to be bored again because it can easily recharge the battery but your battery is going to be getting a major workout like a yo-yo with the power going up and down as it drains a lot from the system and then gets topped up by the alternator over and over again. I've seen a Civic with 2 Rockford Fosgate bd.1000 amplifiers drain a full car battery on 3 bass notes. BOOM, BOOM, BOOM......dead.
    So the point here is when you upgrade something in your electrical, you have to do it all at the same time......alternator, battery and wiring. The wiring is all the points between the battery and chassis, engine and chassis, transmission and chassis. The latter 2 aren't that important for a stereo but might as well while you're in there.

    Topic 2 - The Capacitor
    What does it do exactly? It regulates power, yes, but so does the DC-DC power supply so that's irrelevant. Mainly it stores power from the battery when it can and uses it as a reserve when needed. It's like having a smaller gas tank that your extra gas spills into when your car's not using it. You still have to pay the same amount of money for the same amount of gas, you just have some on reserve now in case you need it. People think it relieves stress from the electrical system but that's nonsense. Your battery is now sending power to your stereo AND your capacitor at the same time which isn't helping anything. And the alternator is working just as hard to recharge the battery that's getting drained just as fast.

    Make sense now?
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    makes perfect since, thanks alot for explaining it, appreciate it... now on my next problem, where can I find any aftermarket alternator sites at for a mitsubishi lancer 2003 es... I have done alot of searching and keep seeing the same results, a refurbished this or new that, but its the same alternator I have... anyone help point me in the right direction please

  9. #9
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    Quote Originally Posted by zbone1 View Post
    makes perfect since, thanks alot for explaining it, appreciate it... now on my next problem, where can I find any aftermarket alternator sites at for a mitsubishi lancer 2003 es... I have done alot of searching and keep seeing the same results, a refurbished this or new that, but its the same alternator I have... anyone help point me in the right direction please
    Unless you drive a big truck or something with a Hemi, there aren't any companies that make new alternators for your vehicle. What you have to do is find a place in your area that sells rebuilt alternators and have them build you a custom one. GM has an alternator that should drop right into your car, then just have someone put a 160 amp winder in it, beep up the components and it should work best kind. The total cost for a job like that will be about $400.
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  10. #10
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    Cheers, it is as I thought that the cap regulates power to amps etc, I wasn't talking about using a cap before the carputer, or about how this would affect the drainage on the electrical system just what the cap does, thanks for your time in responding.

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