with that said...i was running 1 powermaster D925 (which is smaller then the 1200) on a 3800rms system and had NO issues little to no voltage drop...so yes i do see the D1200 handling a 3000w system bein the that D925 is said to handle a 2500w i believe and i threw it in a 3800w system and it took it like a champ! yes i have a 200A alt MLA etc so i have a stout electrical.but still i see this being a user error..adding batts w a stock alt! first mistake, bumpin long periods of time! second mistake, and not letting alt and batts catch up after bumping! 3rd mistake, and the fourth mistake getting rid of powermaster batts....cuz of his mess up imo