Advice on batteries

[Cc2cuz]

Need advice to how much extra batteries I need for my setup. I will be unning (2) digital designs m3b amps, and one audison voce 5.1k for power so that's around 7,500 watts rms total. I have a mechman 370 amp alternator and two 750 cca batteries (stock) in my 2011 f-350 powerstroke. Big 3 and 1/0 throughout but how many batteries and what size do I need for a daily driver playing music only.

Thanks

[Maebros]

http://www.stevemeadedesigns.com/board/topic/69019-xs-power-battery-wattage-guide/

might help

[Cc2cuz]

Nice chart thank you. Now how do I figure in my alternator? Does having a larger amperage alt mean I can use less batteries and vice versa with a smaller alt u need to use more batteries??? Or do I just ignore my alt specs and go by the chart. Thanks

[Maebros]

well having a larger alt you may be able to get away with having a smaller battery bank and not getting serious voltage drop. however its not going to hurt having a larger battery bank as long as you keep can them charged. i would base it on what your voltage levels look like vs where you want them to be at.