i run my xp1400 daily at .5...granted its probably isnt doin but like 1800rms wit my idle voltage at around low 13s...but i can play it for hours and barely start to feel it heat up...even at full tilt driving around it still never gets but slightly warm
I ran an IA 20.1 on a stock 130amp alty and a kinetik 2400 @ 0.5, and it never once gave me any troubles. I even went on a 6 hour drive across the state with it on at a decent volume the whole time, and no troubles.