When do you need dual batteries?

[mystikarkitect 10+ year member]

Just a quick question but...I plan on running a dual amp setup in my 07 Avalanche. Its got a stock 145 AMP alt. Now, do you guys think that I could comfortably run a JBL 1200.1 and a JBL P80.4 off of one Optima Yellowtop without too big of a problem, or am I going to need to upgrade the big 3 or install another battery? I've never done dual amp set ups before so I'm not sure if one battery will be enough to power them.

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[flakko 5,000+ posts]

do the big 3 first...you shouldnt have that much of a problem

 

[blackbonnie 5,000+ posts]

go with big 3 first and when you get some money, then throw in an extra battery, you should be good until then on the big 3.