Ok well i need some help i have an 05 avalanche with the quad alternator set up on it...3 of the alternators run my stereo and then my stock alternator runs my truck...I have 3 of mike singers 350a alternators on it...THE STEREO IS SEPERATE FROM THE TRUCK ELECTRICAL....Im about to order the xs power vcm so i can run 16v batteries to the amp..The amp is a DD z2hv running 2 crossfire xs 15's...now my question is how many of the xs power d1600 batteries do i need?I want to have enough batteries so if i go to an indoor comp i can play with out my truck running....all input is appreciated...