i asked the question cuz i have dual 220 amp alts and 9 1000 cranking amp batts with 5 runs of 1/0 goin to them and i am running 9000 watts rms and even with me at 3000 rpms i still drain down to low 12's :R but im not gonna lean on it tho cuz i just got off tha phone with dom and im gonna run 4 300 amp big boys and i wont have any more probs with voltage