Yeah a single battery will not provide enough juice effectively to 3k to run a good 3k you usually need alternator upgrades or multiple h.o batteries. You're going to invest a good bit of money to sustain voltage. Personally get 1 really good reliable starter for the front and 2 big *** batteries for the back and you should be ok also obviously a big III with 0 gauge.and they are not measured in watts. lol just cold cranking amps and amp hours