I'm wanting to run my sundown 3000 at .5 ohms and was wondering what I need to add to my electrical or what could help. Right now I have 2 c&d 77 ah in the back, factory batt up front, 220 amp alt, 2 runs of 1awg. Thanks in advance.

I think you would be fine, just watch the voltage.

should be fine. i've run mine at .5 for over a year with no issues what so ever, solid amps.

Will do. Running it at 1 ohm doesn't drop below 14. Usually stays around 14-14.7.