2nd battery
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=74971
Printed Date: June 18, 2025 at 12:32 PM
Topic: 2nd battery
Posted By: mike swanson
Subject: 2nd battery
Date Posted: March 23, 2006 at 12:46 PM
How do you guys think the best way to run a 2nd batt in the trunk of a car would be? Many people say different things.
Isolate? or Not?
I have 4 systems coming up that we will run 0g under the hood upgrade and to the back for the amp.
We will use a stinger yellow top for the main batt and 2nd.
We will be installing Memphis MoJos 4000w Rms and will need all the power we can get.
Replies:
Posted By: sprawl85
Date Posted: March 23, 2006 at 12:50 PM
I say do it, and isolate it. Like you said, you are gonna need it. I assume you are upgrading the alt too? And big three?
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fiberglass reminds me of peanut brittle... but fiberglass tastes better!
Posted By: mike swanson
Date Posted: March 23, 2006 at 1:07 PM
sprawl85 wrote:
I say do it, and isolate it. Like you said, you are gonna need it. I assume you are upgrading the alt too? And big three?
OHH Yeah sorry also a H/O ALT
Will the isolator allow the 2nd batt to recharge?
Posted By: jeffchilcott
Date Posted: March 23, 2006 at 1:13 PM
word of warning on that amp....it is very very inefficent
we clamped one at USACi world finals. at 1/2 ohm it was drawing 796 amps worth of current!!!!
ouch
it produced close to 7000 watts though. I suppose ups and downs for that amp
The current setup I am working on produces 8300-8900 depending on just how high the voltage holds during our burps we are running 17.5-17.7 volts to it though
I wil explain more detail after the setup goes to its first show.
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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
Posted By: xscash
Date Posted: March 23, 2006 at 2:53 PM
dont forget to fuse both ends of the 0ga between the 2 batteries. XS
Posted By: mike swanson
Date Posted: March 24, 2006 at 9:47 AM
[QUOTE=jeffchilcott] word of warning on that amp....it is very very inefficent
we clamped one at USACi world finals. at 1/2 ohm it was drawing 796 amps worth of current!!!!
Its a 1ohm amp?
Posted By: mike swanson
Date Posted: March 24, 2006 at 9:49 AM
You should use 2 of these and get 8000w
Posted By: Velocity Motors
Date Posted: March 24, 2006 at 10:28 AM
mike swanson wrote:
Will the isolator allow the 2nd batt to recharge?
Yes, the isolators will charge the battery that is lower and flip over when charged to the other battery. ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: jeffchilcott
Date Posted: March 24, 2006 at 11:13 AM
Yes the memphis 4000d is rated for a minimum load of 1 ohm. we compete in USACi and run amplifiers far below thier recomended loads. this is highly highly not reccomended unless you have a relationship with the manufacturer's are are able to have your products replaced when they blow up.....because after a hile they normally do!
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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
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