When to add second battery

[BigAl 10+ year member]

I am planning to upgrade to a sundown 3500 amp and two ia dp's. I already have a jl 300/4 running my components. How many extra batteries will I need. I know about the big 3 and I know I will need a ho alt. Im just not sure about the batteries. I drive a 97 lincoln town car with a stock 140 amp alt. Also is there a formula that tells me how many batteries I need according to the size of my amplifier. Thanks in advance.

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[Bettr n' Revrse 5,000+ posts]

Not sure on the your question but just so you know Fords alt's are stamped as 140's however from what Ive red they actualy only do 90 amps

 

[BigAl 10+ year member]

My question is how many batteries do I need to run a sa3500 amplifier

 

[bhsdriller 10+ year member]

Get the biggest one you can fit under the hood and xs power d3100 in the back by the amp, 0gauge wire throughout

should be enough juice

 

[audiolife 5,000+ posts]

My question is how many batteries do I need to run a sa3500 amplifier

Adding batteries will only help on the short term. If your amplifier can pull a few hundred amps it will greatly out pull what your alternator can put out and if your alternator is too weak to keep the batteries decently bulk charged you will need to do a lot more maintenance keeping them charged or keeping your listening habits in check with the SoC of your batteries.

 

[Bettr n' Revrse 5,000+ posts]

Adding batteries will only help on the short term. If your amplifier can pull a few hundred amps it will greatly out pull what your alternator can put out and if your alternator is too weak to keep the batteries decently bulk charged you will need to do a lot more maintenance keeping them charged or keeping your listening habits in check with the SoC of your batteries.

Which is why I was telling you that you probably will not see 140amps out of your alt

 

[bubbagumper6 5,000+ posts]

Actually, yes Kinetik has a calculator for how many batteries they recommend based on how much power your running.

Kinetik High Current Power Cells