The amps are Brutus 2600RMS the Fi subs are 15 inch all options that were possible. Heating ring,double voice coil,etc,etc. they were built for daily. Although I don't run it at much more then minimum normally when just playing music. The additional batteries are hooked up in parallel with the existing two 850 amp Ford van batteries. The alternator was a 250Amp alternator and yes I did speak with Excessive amps. He said he has been building alternators for over 10 years etc,etc. the usual and expected reply...Since I am in the Caribbean and a good 2000 miles away I don't have the luxury to argue much. Shouldn't the bigger alternator be able to take care of the additional batteries? I am now installing 2 other batteries (BATCAP 4000), a 350 amp alternator and if I can locate it a bracket kit to run two 350 amp alternators. I don't know what else I can do. I would appreciate your input on this. Many thanks.