At what power limit would you start to drain your battery too much (eg. standard car, standard alternator, etc.)? I have 4 ADC components (each 100W) and have 2 8" subs (each 150W) and may be looking to upgrade my subs to 10" x 2. My total system could easily reach 1000W total. 1000W could drain the battery pretty quickly I suppose? (I don't run the stereo a great deal these days though.)