lol, it depends on how many batteries, ive seen 7k on a stock 100amp alt, but the dude had 10 fat ass batteries. running high power needs charging but charging is nothing without somewhere to store the power.
well i plan on running a dc 5k on a 185 amp alt with 2 beefy batteries in the back. with 2 level 4 xl dc 12's
you will probably want 1 or 2 more batteries, but hell, before you spend any extra money on batteries, see how your voltage sits with just the two, if you need more, then get more.
thanks bro. its going in a daily 99 ford escort zx2. im running 2500 with no voltage drop at the moment with a 185 ho dc alt, factory valucraft bat, and a kinetik hc800 in the back. so i figured if i get a deka up front and two huge batts in the back i can run it.