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Daul batteries 

 

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 Post subject: Daul batteries
Posted: Sat Nov 24, 2007 1:33 pm 
Oompa Loompa
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Hey guys im running a big power stereo in my AU. WHat would i need so i can run a second battery in the boot?
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Posted: Sat Nov 24, 2007 4:30 pm 
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Lots of thick wire, a few fuse holders, battery terminals and a battery isolator.

Why do you think you need a second battery? How do you plan to use the stereo? With car running? With car off? Both?
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Posted: Sat Nov 24, 2007 4:31 pm 
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Depends on alot of things

for a basic setup you can have just a BIG solenoid on the second battery so it only pulls in when the car is running.

Or you can have it so only power from the alternator will come through, but you would need a big diode aswell

So. .

Solenoid
Big Battery cable
small wire for activating the solenoid
Diode (?)
Terminals

 

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Posted: Sat Nov 24, 2007 11:40 pm 
Oompa Loompa
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hey its on a au series 2 falcon. I am goign to runa 1000 watt amp for the speakers and 2 1500watt rms amps for the subs.
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Posted: Sun Nov 25, 2007 9:13 am 
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With the car running or off?
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Posted: Sun Nov 25, 2007 11:10 am 
Oompa Loompa
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With the running. I am looking at runing all the power to the amps from the battery in the boot. I am thinking of running a dry cell in the boot. So im guessign it would need to charge when the car is running that way the battery under the bonnet is only used to start and power the car like nomal.
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Posted: Sun Nov 25, 2007 11:30 am 
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When your car is running your alternator is providing the power, the battery will only provide power when your equipment draws more current than the alternator can supply. Even then if only does it for a split second with LOUD bass beats.

You're better off buying a dry/gel cell battery for the front and see how it goes rather than wasting the cash on an extra battery when you might not need it.
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Posted: Sun Nov 25, 2007 2:34 pm 
Oompa Loompa
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so what would i need to be able to charge a dry cell battery in the boot?Im after the daul batteries so that the altenator isnt under pressure to keep the power for the stereo.
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Posted: Sun Nov 25, 2007 8:54 pm 
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Also don't forget it needs to be a sealed battery not a normal car battery.....

 

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Posted: Sun Nov 25, 2007 9:27 pm 
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Don't think that simply adding another battery will make everything better.

In order to run two batteries for what you are explaining you will need...
- Roughly a 100A isolator
- A nice length of at least 0g (or equivalent) wire

The questions you need to ask yourself are...
- How loud do I run my stereo?
- Is it going to be drawing 100+ amps all the time?

Someone correct me if I'm wrong, but a Falcon alternator produces in the region of 70-80amps/hr. The amplifiers you are describing, at FULL volume, would be using something like 200amps. Simply adding a second battery will delay how long it takes for your battery system to run flat. The isolator will compensate for the drain on the rear battery by transferring more charge to it.

Like Stone said, your best bet is to run one nice big dry cell battery in the front with good wiring.

... Unless your name is pyroay ... :roll:
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Posted: Sun Nov 25, 2007 9:29 pm 
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outlawxr6 wrote:
Also don't forget it needs to be a sealed battery not a normal car battery.....


??? All batteries are sealed... If you do install a battery in your boot then it needs to be stored in a fixed sealed box which is vented to the outside
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Posted: Sun Nov 25, 2007 9:33 pm 
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a sealed battery is one that doesnt have any liquid inside them (like a Lead Acid battery aka supercheap specials)

 

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Posted: Sun Nov 25, 2007 9:37 pm 
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I was under the impression that's what you call a dry cell battery mate. They use a low-moisture electrolyte as opposed to a liquid electrolyte in lead-acid batteries.

Sealed batteries are simply batteries that are... well... sealed :roll:
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Posted: Sun Nov 25, 2007 10:37 pm 
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EF alts are 110amps, EL 100amp.
I think he might have meant a sealed box in the boot for the battery in the boot.

 

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Posted: Sun Nov 25, 2007 11:26 pm 
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joe23 wrote:
so what would i need to be able to charge a dry cell battery in the boot?Im after the daul batteries so that the altenator isnt under pressure to keep the power for the stereo.

You're not understanding.

A second battery puts more strain on the alternator, not less. The alternator supplies power to the car and charges the battery... If you have more than one battery the alternator has to charge the additional batteries therefore is working harder.

The only time the second battery will be used is if the amps draw too much power for the alternator and your voltage drops down to the batteries level. This will happen with one, two, three or 50 batteries.

Anyway, if you REALLY want a second battery, it has already been explained what you need. Battery, wire, isolator, fuse holders, fuses, etc. If you can't work it out, you should take it to a professional.
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