Anyone ever run a smaller secondary battery into their trunk for audio purposes?
I have been thinking of adding a Shuriken SK-BT20 to the trunk to run my amps from and maybe even replacing the front battery with one smaller as well.
-High Performance Battery for use with audio system -Handles up to 600 watts RMS -Built with AGM (Absorbed Glass Matt) technology allows the battery to be mounted in any position without spilled -Resistant to heavy vibrations and heat -Super low ESR -Amp Hours: 20ah -Cranking Amps: 850a -Weight: 15 lbs. -Dimensions: 3"D x 7-1/2"W x 6-1/2"H
#13128, "RE: Adding secondary battery to trunk?" In response to Reply # 0
Make sure it's a sealed battery that doesn't require venting. I couldn't tell from the link if that one was or not. The vapors released from a battery can concentrate to deadly levels very quickly inside the cabin of a car. Otherwise it will work, but you're still dealing with our wussy alternators. Basically it's a bandaid fix.
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#13129, "RE: Adding secondary battery to trunk?" In response to Reply # 1
Would it be good to possibly go with 2 small batteries one up front and one in the back? The one I suggested is a sealed battery and can be mounted in just about any direction or location.
#13130, "RE: Adding secondary battery to trunk?" In response to Reply # 2
The problem you're still dealing with is the fact that the alternator really isn't up to the job of keeping up with the draw that a big stereo creates. An extra battery takes some of the stress directly off of the alternator for a while, but take a good long drive with the stereo bumping and eventually the alternator won't be able to keep up and you'll either burn it out or drain the system.
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#13132, "RE: Adding secondary battery to trunk?" In response to Reply # 4
There you go!
I found out the hard way years ago that you can't ecsape the lack of a high output alternator with a big stereo. Things like backup batteries and capacitors help to soften the blow to the charging system, but they're just bandaids on a bleeding artery.
There's a little math involved in figuring exactly out how much juice you actually need, but I figured out years ago that a 1600 watt stereo (what I had in my car) needs ~120 amps of current at 14 volts to play at full tilt. Normal listening was at half volume so the draw would have been around 60-80 amps. Running the car takes about 50-60 amps without the heater/AC, lamps and stereo. Our alternators put out 85 amps IIRC.
Your system may not be that big, but you get the idea.
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#13134, "RE: Adding secondary battery to trunk?" In response to Reply # 6
Meh, I was off by 5 amps
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#13135, "RE: Adding secondary battery to trunk?" In response to Reply # 7
Originally posted by RoninEclipse2G Meh, I was off by 5 amps
That's right.. now I have to give you negative points!
Any suggestions to a reputable place that sells a good high output alternator for our cars?
I knew there was once a place called 4altstart which seems to have moved to http://www.alterstart.biz/ now and I was probably going to go with them back then. I wonder if there are other places that anyone else may suggest.
#13149, "RE: Adding secondary battery to trunk?" In response to Reply # 6
youll be fine adding a 2nd batt in the trunk, as long as its a sealed batt. also if your just running a 1200w amp, there is no need for a high output alt as long as you have the 2nd batt. i had 2 3000w amps in mine with 3 xs power d3100 batts on the stock alt and had no issues. you can also add a volt meter, i use the stinger one that you can find on ebay for bout 25, so that you can watch your voltage to make sure its not dropping to low.