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Duel/twin battery setups 

 

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 Post subject: Duel/twin battery setups
Posted: Tue May 10, 2005 5:09 pm 
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i got no idea but have considered a second battery, does anyone know how to set up a car for 2 batteries??????

 

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Posted: Tue May 10, 2005 5:12 pm 
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a good idea might be to check out what the 4x4 drivers do? i know my dad is looking into a twin setup for his hilux, and most 4x4 shops websites etc have info on dual setups :?

 

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Posted: Tue May 10, 2005 5:19 pm 
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easy enough to do ... just finding a spot for it will be your biggest hurdle. I don't think you are allowed to have them inside the cabin!

 

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Posted: Tue May 10, 2005 5:20 pm 
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nor the boot unless its got ventilation.... maybe a small japanese one in the engine bay???

 

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Posted: Tue May 10, 2005 5:30 pm 
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Just go to an auto shop (e.g. Repco) and they sell the kits, you'll need to buy the second battery seperately, but the kits provide the thick wiringing you'll need and some sensor thingo that checks the battery levels and does someother stuff.

 

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Posted: Tue May 10, 2005 5:42 pm 
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quite an easy process. they shouldn't be mounted in the cabin and i recommend a dry cell battery, optima or odyssy. boot is a good spot out of the way and saves the space inside your engine bay. Run the power cable (+ and -) from the front battery to the second unit. i recommend using 4ga. put a fuse holder at each end of the +'ve cable within 300mm of the battery or as close as possible, incase the cable earths. 40-60amp fuse is big enough. You can also put in a switch if you ever wanted to isolate the two batteries for whatever reason (car audio, fridges etc) when your engine isn't running (eg aerpro model number AP4842). Hope this helps
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Posted: Tue May 10, 2005 5:55 pm 
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if it is in the boot you still need to have it ventalated.

 

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Posted: Tue May 10, 2005 6:21 pm 
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Happy wrote:
if it is in the boot you still need to have it ventalated.


Not as much of a problem if its a dry cell. Lots of people put dry cells in the boot. No need for a whirly bird on the bootlid! :D

 

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Posted: Tue May 10, 2005 7:47 pm 
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Would one of those yellow/red or blue tops batterys be a solution instead of having 2 batteries? Just wondering because a bloke at work who recently one the Tasie National Car Sound comp uses a blue one and he's having no problems - I've never heard subs pump that loud before.
And they cost like $400 so 3 or 4 times a normal battery, thought that must mean there pretty special!

 

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Posted: Tue May 10, 2005 8:33 pm 
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how much do these second battery cost guys and also do you runn the negative of the second battary to th negative of the first battery.

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Posted: Tue May 10, 2005 8:43 pm 
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The DMac wrote:
how much do these second battery cost guys and also do you runn the negative of the second battary to th negative of the first battery.

Cheers

depends if you want 12v or 24v :!:

 

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Posted: Tue May 10, 2005 9:36 pm 
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yeah an optima yellow or blue top are great they are heaps better and well worth the money

runs my huge stereo for ages without the car on

 

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Posted: Tue May 10, 2005 9:42 pm 
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The DMac wrote:
how much do these second battery cost guys and also do you runn the negative of the second battary to th negative of the first battery.

Cheers


Depends on the quality of the second battery you buy really.
And yes, you would run the negitive to the negitive - obviously. You could either earth it to the chasis and it'l run that way or direct cable.

 

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Posted: Tue May 10, 2005 11:09 pm 
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this battery venting has got me curious so I am trying to find the regulations on it. Having no luck so far but I did find this post in a thread somwhere.

Quote:
A friend of mine had an old Capri years ago. The battery was mounted in the boot without a box. ACT rego even looked at it and said it was OK.

The thing was, a couple of months later the alternator started overcharging, which caused the battery to start giving off hydrogen. The hydrogen started filling the boot, which nobody noticed. Then he stopped to fill the car up at a service station, which was all fine until he went to restart the car, at which point one of the battery terminals sparked as it was loose.

The resulting Hindenberg impression blew open the boot, blew the back seat into the the front seats, noticably bulged both quarter panels and shook the windows of the service station. Nobody was hurt but it makes you think that sealed boxes vented to outside are a pretty good idea.


My question is now, do dry cell batteries give off any combustable gas?

 

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Posted: Wed May 11, 2005 6:12 pm 
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okay then, umm how much would a 12 volt one be and a 24volt one. And if the 24volt one was instled would you need a transformer or something to get it to 12v
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