how do you figure out how many batteries
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=104406
Printed Date: April 28, 2024 at 5:38 PM
Topic: how do you figure out how many batteries
Posted By: may03lt
Subject: how do you figure out how many batteries
Date Posted: May 01, 2008 at 7:54 PM
Hey all....
Is there a guide for determining how many batteries are needed for an audio system? Im in the planning stages of adding additional amplifiers and want to do it right if you know what Im saying!
tia
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2003 Trailblazer LT
2007 Envoy SLT
Replies:
Posted By: haemphyst
Date Posted: May 01, 2008 at 7:57 PM
One. The power does NOT come from the batteries. It comes from the alternator! If you "want to do it right", you'll address the source of all the power in a car FIRST!
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: Alpine Guy
Date Posted: May 01, 2008 at 9:53 PM
Like stated above, you need an high output alternator, not more batteries. Batteries store power, alternators make power.
We need to know what car you have, how big the stock alternator is, and what are the fuse sizes on your amps.
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: may03lt
Date Posted: May 01, 2008 at 9:57 PM
gotcha - im sorry i should have provided more details... 
Currently I have an Ohio alt/ single batt and around 3,000 watts rms and am not having any problems with the charging system. For regular daily use it holds up well. However Im planning on adding more then double the power and want to plan this install to the fullest before i cut the first board.
One more thing, Im limited to a single alt. The alt companies do not show love to the gm I6 4.2 for a dual alt setup. ------------- 2003 Trailblazer LT
2007 Envoy SLT
Posted By: daboss593
Date Posted: May 02, 2008 at 3:39 AM
what kind of car is this? you can put a dual alt setup in almost any car. chances are you will have to take out your ac. for the cost of a dual alt set up for only a little more $$$$$$ you can just get a HO alt. you may have to find an alt thats not for a 4.2. exp my cars a 1984 caddy elderado fwd t 4100 motor. but this car also was made to take a 5.7 motor. so i have room to play with. at this time im looking into getting a truck alt. some of these are in the 160-180 amp range. for my current system this will be fine. im only running 12-1300 watts. then again it helps my dads a grease monkey of 34yrs.
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OWWWWWWWWWWW you said you discharged the cap!
Posted By: jmelton86
Date Posted: May 02, 2008 at 4:14 AM
I'm assuming they have either a Trailblazer, Envoy, or Rainier.
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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001
Posted By: boogeyman
Date Posted: May 02, 2008 at 8:51 AM
please dont get a second battery, get the biggest alternator you can find and upgrade the big 3 .
Posted By: aznboi3644
Date Posted: May 02, 2008 at 11:45 AM
actually after upgrading the alternator it is fine to add another battery...reserve power is nice. The alt is big enough to handle the extra load so it isn't a problem.
Posted By: may03lt
Date Posted: May 02, 2008 at 5:30 PM
daboss593 wrote:
what kind of car is this? you can put a dual alt setup in almost any car. chances are you will have to take out your ac. for the cost of a dual alt set up for only a little more $$$$$$ you can just get a HO alt. you may have to find an alt thats not for a 4.2. exp my cars a 1984 caddy elderado fwd t 4100 motor. but this car also was made to take a 5.7 motor. so i have room to play with. at this time im looking into getting a truck alt. some of these are in the 160-180 amp range. for my current system this will be fine. im only running 12-1300 watts. then again it helps my dads a grease monkey of 34yrs.
Im running a 260 it holds up fine.....im not willing to lose a/c either......there is a nice place for one next to the factory one, but the fuel line is in the way
jmelton86 wrote:
I'm assuming they have either a Trailblazer, Envoy, or Rainier.
Ding Ding Ding, 4.2 Trailblazer with the transverse alt! Sorry theres no prize
boogeyman wrote:
please dont get a second battery, get the biggest alternator you can find and upgrade the big 3 .
Alt - check, big 3 check (1/0), like i said no probs now just looking down the road
aznboi3644 wrote:
actually after upgrading the alternator it is fine to add another battery...reserve power is nice. The alt is big enough to handle the extra load so it isn't a problem.
is there any guide for how much reserve to have?
btw good to hear from you (you've helped me before)  ------------- 2003 Trailblazer LT
2007 Envoy SLT
Posted By: may03lt
Date Posted: May 03, 2008 at 3:16 PM
So if Im basically adding a reserve, i can add as many as I want in the space provided?
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2003 Trailblazer LT
2007 Envoy SLT
Posted By: daboss593
Date Posted: May 04, 2008 at 12:06 PM
you can have a custom made fuel line made. but chances are you will have to adj your fuel pressure. as far as adding more batts i dont see what the big problem is here? more is always better?. ------------- OWWWWWWWWWWW you said you discharged the cap!
Posted By: may03lt
Date Posted: May 10, 2008 at 6:02 PM
Yeah, dont want to mess with the fuel line, maybe if she gets retired and is no longer a daily driver lol
The problem is that Ive never built anything with this much (6000+ rms) total power. No shame here, I blindly installed my system only to realize that my charging system couldnt keep up and I had to put out another $500 for an alt and big 3.....what it all comes down to is i want to be prepared beforehand.
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2003 Trailblazer LT
2007 Envoy SLT
Posted By: mcben789
Date Posted: May 11, 2008 at 7:27 PM
daboss593 wrote:
you can have a custom made fuel line made. but chances are you will have to adj your fuel pressure. as far as adding more batts i dont see what the big problem is here? more is always better?.
I'm pretty sure more isn't always better. If you have an alternator that can keep both of the batteries charged fine it would be cool, but if you just have a stock alternator you can't just throw ten batteries in there thinking it will help. I think it will actually put more stress on your stock alternator trying to recharge all those batteries.
Big 3, H.O. alt., and then worry about batts... ------------- Sasquatch...
We know your legend's real...
Posted By: daboss593
Date Posted: May 11, 2008 at 8:50 PM
mcben789 wrote:
daboss593 wrote:
you can have a custom made fuel line made. but chances are you will have to adj your fuel pressure. as far as adding more batts i dont see what the big problem is here? more is always better?.
I'm pretty sure more isn't always better. If you have an alternator that can keep both of the batteries charged fine it would be cool, but if you just have a stock alternator you can't just throw ten batteries in there thinking it will help. I think it will actually put more stress on your stock alternator trying to recharge all those batteries.
Big 3, H.O. alt., and then worry about batts...
well thats why you do a charging test? no one said 10 batts in fact my car came stock with 2 batts org? 2 batts and a decent upgraded alt is fine. ------------- OWWWWWWWWWWW you said you discharged the cap!
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