Its been enough for me. Although my bass head days have since gone, and now into performance,so i dont really crank up the system too much anymore, but when i do, the stock 90 amp alt works fine. Unless your amps draw a lot of current, and you constantly have the volume turned up, the stock alt should be fine. If you dont have one, i *highly* recomend using an Optima Yellow top battery. They rock.