Audio secondary battery

[autobyswizz]

Hello all Im looking to add a secondary battery in my model 3 for audio and ambient lighting any tips would help

 

[Gauss Guzzler]

dont

 

[rpiotro]

dont

This!

 

[Shelburne]

Several people have said "don't". I agree but also add, "Why?" The audio and ambient lighting in the M3 draws very little battery power. Even if you can do it, it's just not worth the cost and effort.

 

[rotarypower101]

In theory would a larger LV battery capacity waste less energy in certain scenarios, as the contractors and systems wouldn't need to be turned on/off as frequently, for instance when camping and drawing off the LV cell directly?

Is there a known limit to the DC2DC ability to charge the LV system with a larger battery capacity?
Think I have seen people running 1000W inverters off that system, so it seems like it would be capable of handling a secondary or larger replacement 12V AGM/FLA battery on the older systems with little trouble?

Possible anyone has used a larger capacity LV battery and has feedback on the topic?

 

[Uhtred]

I have a secondary battery in rear for audio system, no issues.

 

[SiW80]

I have a secondary battery in rear for audio system, no issues.

Is it connected to the penthouse or front battery?

 

[Uhtred]

Is it connected to the penthouse or front battery?

Penthouse to 200A breaker to a 200A battery isolator and then battery

 

[fholbert]

Hello all Im looking to add a secondary battery in my model 3 for audio and ambient lighting any tips would help

You’re already driving a battery with wheels and doors. Why do you need another battery?

 

[Unclepaul]

Adding an auxiliary battery for a sound system is a hold over from ICE days. Your car already has enough extra battery to run such a system.
Adding another battery will add complexity weight and cost, for little benefit.
Ambient lighting now is usually LED and will consume little current. The stock audio system is already pretty robust, and would put the effort into designing a current efficient audio system, and not be sucked into the sound pressure level of upgraded audio to win competitions.
Sometimes better is the enemy of good.