Power banks

[Mr FaceCaser]

So I have a XS SB500.34 power bank/battery hooked up for my audio system it has max power is 4000 watts so does that mean I don't need to upgrade my alternator unless I go over the 4000 watts or what does that actually mean and when should I upgrade my alternator. I'm trying to learn more about car audio so any information will help

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[Mr FaceCaser]

Here's. Reference image

 

[Doxquzme Premium Member]

What amplifier(s) are you using?
What speakers?
Is this your main battery or is it a 2nd battery?
If it is a 2nd, how are you wired up?
What if any other upgrades to electrical do you have (big 3)?