battery or alt upgrade

hello i have 1 240 amp alternator but i need more amps if i add another 240 amp alternator will that help or add 1 400 amp alternator and if i add 2 240 amp alternators make it 480 amps or a strong 240 amps im looking to power a dd m3b and 2 mtx 3404 amp plus 2 sets of 35 watt h.i.d lights for...

plan on running a 2400-2800 rms setup (3/4 subs) with a nice amp i got my eye on the aq2200d or maybe 2 aq1200d still looking around but my question is how do i determine what batteries i need?is it a preference type of thing? im not looking for a HO alt right now but will get one soon.can...

Hey i drive a honda civic lsi coupe 1994. Am currently installing a sound system kickers solo x and a warhorse. i have no idea what kinda batteries to buy to power it so i need help big time :(