Question about ho alt and 2nd battery

[masonv6]

next week I am ordering my sound system for my car. I am getting 2 SoundQuebed HDS312's and 2 Q1-1200 to power them. I am also getting the Q4-120 to power my components.

I plan on ordering either MechMan or Singer HO ALT. I am trying to keep the ALT pric around $400 to $500 depending on where I get it and what kind of deal I can get it for. Either 240amp or 320amp.

My biggest question is how do I figure out how many or what size batteries I will need. Any help would be fantastic. Thank you

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[mylows10 5,000+ posts]

Well first off either size alt will cost more than $400 new. But what your asking will depend on your cars electrical. But most would just need a group 31 for those amps

 

[masonv6]

Is there another battery beside group 31. I looked and I guess Minnesota Sam's don't carry them for whatever reason

 

[C1500martin 10+ year member]

Is there another battery beside group 31. I looked and I guess Minnesota Sam's don't carry them for whatever reason

Order the batteries online most people use xs power

 

[masonv6]

Went to XS Power website put my car in and my car call for a D3400. If I threw that under the hood with a HO 240A I might be alright with voltage drop. If it drops off more than I would like I could always add a second one in the trunk