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#1441493 - 07/18/08 08:49 AM DUAL BATTERY SET UP 12 VOLTS 1998 CHEVY SILVERADO C1500 98
fst4dr96
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Registered: 07/16/08
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I HAVE A 1998 chevy silverado c1500 2wd with a 5.7L and factory 105 amp alternator, stock electrical system.

i have a crossfire XT212 in a slot ported box and its 1000-1,300 rms so i would like to get the most out of it.

i currently have a 600 rms alpine set up with a mtx stealthbox and 10" 400 rms sub , 2 gauge jl amp kit, audiocontrol epic center , electrical system bone stock. this system will be replace by the crossfire set up. this set up leaves the batery voltage between 13.2-13.8 and i've seen it drop to as low as 12.6 -12.8 during the night with all the accescories on like headlights, a/c , wipers , turns signals.

the truck has a location for another battery on the opposite side of the engine bay . i think this is the best solution since i want to stay as close to 14 volts while the amp is under full tilt . the amp will be a crossfire vr100d or a hifonics brutus 1,600 which both amps should give me 1,200 rms @ 13 volts.

now to setup the dual batteries does anyone have a wiring schmatic or drawing of how to wire it up. i was told from my stock battery + to + & - to - of the battery i'm adding . then a ground bolted to the frame of the truck from the ground on the battery i'm adding. does this sound right ?

also will i have to worry about the stock alternator of 105 amp being able to charge two batteries or do i have to get a beefy alternator for the task ? any and all help is appreciated thanks!
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#1441570 - 07/18/08 09:53 AM Re: DUAL BATTERY SET UP 12 VOLTS 1998 CHEVY SILVERADO C1500 98 [Re: fst4dr96]
keep_hope_alive Moderator
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adding another battery WILL NOT help you maintain 14V, in fact it will hurt it. only your alternator can provide 14V and only when the total current draw (vehicle, system, and charging both batteries) is less than it's output at that RPM. adding another battery adds another load. The second battery will help you maintain ~12.7V and resist dropping to 12V. It will also help you run your system for extended periods with the vehicle off.

just upgrading the alt is your best bet. after you upgrade the alt you can decide if a second battery makes sense. you don't have that much power.

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#1441575 - 07/18/08 09:56 AM Re: DUAL BATTERY SET UP 12 VOLTS 1998 CHEVY SILVERADO C1500 98 [Re: fst4dr96]
KLCTexas
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The alternator is the limiting source in the electrical system, since it produces the elecricity. You would need a higher output alt in order to charge both of those batteries, as well as an isolator to keep the batteries from killing each other.

^^^ KHA got me while I was writing! \:p


Edited by KickerLovinCorolla (07/18/08 09:56 AM)
Edit Reason: KHA
_________________________
To the well organized mind, death is but the next great adventure. - A.P.W.B.D.
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#1441578 - 07/18/08 10:00 AM Re: DUAL BATTERY SET UP 12 VOLTS 1998 CHEVY SILVERADO C1500 98 [Re: KLCTexas]
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you don't NEED an isolator. if they are just ran in parallel then they work together. the isolator is great for park and play applications so the starting battery is not affected.

the concern is that the weaker battery will suck juice from the newer battery, which will cause the newer battery to fail. also, if one battery fails the other will try to charge it which can cause it to fail as well. parallel battery setups can work great - ask any SPL competitor using a bank of batteries. but those successful setups are operated by savvy people who keep them charged. as long as you keep a voltage gauge in the vehicle (idiot lights don't count) and make sure you're reaching 14V you know your batteries are getting a full charge.

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#1441603 - 07/18/08 10:21 AM Re: DUAL BATTERY SET UP 12 VOLTS 1998 CHEVY SILVERADO C1500 98 [Re: keep_hope_alive]
fst4dr96
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my truck has daytime running light being a 98 model and without the system on at idle the voltage is 13.8 - 13.7 . only when i first start the truck once it has sat for a while like overnite as soon as i crank the truck up is reads 14.4 volt then slowly drops off to about 13.8 volt vias the voltage meter in my pioneer headunit is the fancy DEHP880PRS :



so the alternators on ebay that are 250 amps with a one year undisputed warrany the ones to go for >? all i need is an high out put alternator to run 1,200 rms all day long ? is about 110 amps of current draw when knocking at .9 ohm.
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#1441629 - 07/18/08 10:47 AM Re: DUAL BATTERY SET UP 12 VOLTS 1998 CHEVY SILVERADO C1500 98 [Re: fst4dr96]
keep_hope_alive Moderator
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you need an alt that is sized for your load; everything in the vehicle. also, keep in mind that a 250A alt will not provide that except at max RPM. At idle the current available is much less. How much less depends on the alt.

Your best bet is to install a separate volt meter wired directly to the battery - that will be much more accurate. not sure i'd trust the meter on your HU unless your HU is directly powered from the battery.

also, realize the amp will not be drawing that much except for short duration musical peaks. the amount of power is directly related to volume.

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#1441754 - 07/18/08 12:46 PM Re: DUAL BATTERY SET UP 12 VOLTS 1998 CHEVY SILVERADO C1500 98 [Re: keep_hope_alive]
fst4dr96
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I KNOW 14.4 VOLT CONSTANT IS IMPOSSILBE ...

i would like to keep voltage above 13.0 volts as much as possible. the alternator i have in mind says 125 amps at idle and 250 amps from 1,950 rpms+

so hopefully its a good one from de electronics . i know the chrome one will get hotter quicker but why not have some chrome under the hood. will a high output alternator be able to keep up with two optima dry cell deep cycle batteries ? which i heard the yelow tops have a built-in capacitor type deal anyways .

my enemy is voltage drop and since i listen to bass for 3-4 min staight all full 3/4 volume i know it doesn't sound like much time but while running at full tilt with accesories on the truck on also, i want to be safe. do i really need a voltage regulator if i just runn them in parallel i've already learned my lesson about pounding the system with the vechical off and know better than that . also both of the batterys are new i'm not going to try to get one used battery and one new battery to work.

or should i just get another alumapro C.A.P. 15 farad its the only one i've seen that really make a difference as far as capacitors go.
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Crossfire audio - memphis - PPI

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#1441815 - 07/18/08 01:48 PM Re: DUAL BATTERY SET UP 12 VOLTS 1998 CHEVY SILVERADO C1500 98 [Re: fst4dr96]
KLCTexas
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Capacitors are evil...
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2003 Honda Civic LX Sedan
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#1441881 - 07/18/08 03:21 PM Re: DUAL BATTERY SET UP 12 VOLTS 1998 CHEVY SILVERADO C1500 98 [Re: KLCTexas]
keep_hope_alive Moderator
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that alt should help. you don't need an isolator for your application.

the cap won't help you.

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