Dual Battery Wiring
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=67617
Printed Date: April 28, 2024 at 4:00 AM
Topic: Dual Battery Wiring
Posted By: cirrusly_fast
Subject: Dual Battery Wiring
Date Posted: December 04, 2005 at 11:17 AM
Quick question. Lately I have been reading posts about spare batteries. Since I have one I want to make sure that I have it done correctly. I noticed alot of talk about series and parallel wiring on batteries. Can someone expain how a battery is wired in series and parallel?
I know that in military humvee the two batteries are setup for 24 volt operation. Is it the same type of thing?
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Cuz I'm Kewl Like That.
System: 1-12" Orion H2, Crossfire VR2000D,Odyssey C2150 battery
Replies:
Posted By: fingaz22
Date Posted: December 04, 2005 at 12:37 PM
no it is not ,that will fry you hole car. run a isolator inbetween the two batterys to keep them seperated run the positive wire from the car battery to the isolator then from the isolator to the positive of the second battery. ground both batterys to the chassis. use proper gauge wire for your amparage draw of you system for both pos. and neg. fuses accordingly very important. this is a parrelle set up and the humvee uses a series setup to double the voltage for it system that is all rated at 24 volts. a car is all setup a a 12volt rating. dont run it series it will damage your hole car eletrical system or atleats everything that comes first inline.
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JUST ONE MORE AMP!!!
hu,alpine cva 1005/dva 5205
sound processor,symmetry(first one).
sub amp,power 1000 the terminator.(1992).
subs,spl comp dual 1 ohms.
punch 150hd on a 10" ev.
alotofhighs
Posted By: cirrusly_fast
Date Posted: December 04, 2005 at 12:54 PM
that's what i figured. from the 1st batt to the isolator, do you need a fuse?
right now I'm trying to get a h.o alternator and change the big 3. currently i have a not so great setup. i have 1/0 awg from the 1st battery to the second in the trunk, with appropriate fuse. then I have the sec battery grounded on a 1/0 inlet gold grounding post to the chassis. Does that makes sense to you?
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Cuz I'm Kewl Like That.
System: 1-12" Orion H2, Crossfire VR2000D,Odyssey C2150 battery
Posted By: fingaz22
Date Posted: December 04, 2005 at 1:16 PM
no usaully right after the isolator and yes all that sounds to be correct. the ho alternator is the best thing you could do for you system , once the car is running the alternator is suppling the car and system, not the batterys only when the car is not running does the second battrery come into play. the reason for that is so you will not kill your cars battery. lol
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JUST ONE MORE AMP!!!
hu,alpine cva 1005/dva 5205
sound processor,symmetry(first one).
sub amp,power 1000 the terminator.(1992).
subs,spl comp dual 1 ohms.
punch 150hd on a 10" ev.
alotofhighs
Posted By: cirrusly_fast
Date Posted: December 04, 2005 at 1:19 PM
ok, so is it still suggested that either way I get an Isolator?
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Cuz I'm Kewl Like That.
System: 1-12" Orion H2, Crossfire VR2000D,Odyssey C2150 battery
Posted By: speedwayaudio1
Date Posted: December 04, 2005 at 1:38 PM
I don't run a isolator. i have been running dual batts for years never used a isolator. not needed imo. my freinds dually don't have one, his wreaker has 3 batts it don't have one. my other buddys Mack truck has 6 batts it don't have one. That's my 2 cents, your results my very.
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Big Dave
Posted By: fingaz22
Date Posted: December 04, 2005 at 1:56 PM
what the isolator does is keep it seperated from the vechiles battery so you cant draw on it power and end up with a dead battery no start. that is worth it for like 60 bucks, a tow will cost you more than that. by that guys wrecker.
-------------
JUST ONE MORE AMP!!!
hu,alpine cva 1005/dva 5205
sound processor,symmetry(first one).
sub amp,power 1000 the terminator.(1992).
subs,spl comp dual 1 ohms.
punch 150hd on a 10" ev.
alotofhighs
Posted By: cirrusly_fast
Date Posted: December 04, 2005 at 2:01 PM
ok so i was just looking at some isolators.
are isolators and isolator relays the same?
how big of an isolator would i need?
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Cuz I'm Kewl Like That.
System: 1-12" Orion H2, Crossfire VR2000D,Odyssey C2150 battery
Posted By: fingaz22
Date Posted: December 04, 2005 at 2:10 PM
no you want an isolator and depending on your systems amparge draw it will vary. common 60 to 100 amps
-------------
JUST ONE MORE AMP!!!
hu,alpine cva 1005/dva 5205
sound processor,symmetry(first one).
sub amp,power 1000 the terminator.(1992).
subs,spl comp dual 1 ohms.
punch 150hd on a 10" ev.
alotofhighs
Posted By: cirrusly_fast
Date Posted: December 04, 2005 at 2:49 PM
can too big of an isolator hurt. my amp, i guess has internal fuses.
-------------
Cuz I'm Kewl Like That.
System: 1-12" Orion H2, Crossfire VR2000D,Odyssey C2150 battery
Posted By: fingaz22
Date Posted: December 04, 2005 at 2:53 PM
no as long as you have your amp fused accordingly the only thing it will hert is you pocket just a waste of money. i just noticed what you have for a system. what are you considering on the isolator for a rating?
-------------
JUST ONE MORE AMP!!!
hu,alpine cva 1005/dva 5205
sound processor,symmetry(first one).
sub amp,power 1000 the terminator.(1992).
subs,spl comp dual 1 ohms.
punch 150hd on a 10" ev.
alotofhighs
Posted By: cirrusly_fast
Date Posted: December 04, 2005 at 3:21 PM
Hi Fi Sound
Don't really know, probably that 125 amp.
What's the difference on the 4 post ones in that page? ------------- Cuz I'm Kewl Like That.
System: 1-12" Orion H2, Crossfire VR2000D,Odyssey C2150 battery
Posted By: geepherder
Date Posted: December 04, 2005 at 5:24 PM
One thing I noticed- make sure you fuse both batteries. I'm curious, why do you feel the need to add a second battery? I'm not sure of the difference of the isolators- the descriptions on that page are the same. ------------- My ex once told me I have a perfect face for radio.
Posted By: cirrusly_fast
Date Posted: December 04, 2005 at 5:41 PM
well I already added the extra battery. I've been running it for over a year now. When I first bought I was hoping to eliminate the dimming of the lights.
Wouldn't the stock battery already be fused properly if it's set to run the car. All I did was run the spare battery straight off the pos of the stock battery with the correct fuse.
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Cuz I'm Kewl Like That.
System: 1-12" Orion H2, Crossfire VR2000D,Odyssey C2150 battery
Posted By: geepherder
Date Posted: December 04, 2005 at 5:58 PM
Well, the stock wiring is already protected, but you added a wire up front to run to the back battery. This wire needs a fuse at the front battery as well as the back one. Think about it- if the wire shorts between the fuse (you connected in back) and the front battery- your car could catch fire because the wire still gets power from the front battery. ------------- My ex once told me I have a perfect face for radio.
Posted By: cirrusly_fast
Date Posted: December 04, 2005 at 6:29 PM
no i got that fused twice. trust me, i'm not a pro, but i do know what i'm doing.
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Cuz I'm Kewl Like That.
System: 1-12" Orion H2, Crossfire VR2000D,Odyssey C2150 battery
Posted By: speedwayaudio1
Date Posted: December 05, 2005 at 11:46 AM
there are only 2 reasons to run a multi batt set up. 1.If you have a high compression motor. Such as a big deisel, some are 21:1 your car is only 8.5:1 stock. you need the cranking amps of multi batts to turn over those big motors. 2. So you can play your music longer or light your lights longer or what ever you need the power, without your motor running. When your motor is not running then your isolator is isolating your other batts. Whats the point in that? When you motor is running your alt is powering your system multi batts are doing nothing, but getting charged. If someone is dumb enough to run down their batt playing music, then they should just get some jumper cables and ask for a jump. ------------- Big Dave
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