I have a 2 channel Alphasonic amp doing 1500 watts at 2 ohms and a Memphis 4 channel 150 x 4. I have a 5 farad cap with 2 AUG power wire and a 150 amp alt. When I pound the music for about 30 minutes straight, my battery are killed. What should I do in order to play it day to day? I only drive the car on the weekends and can't make it through about 4 songs straight without it dying on me.