These things pull about 1500 watts which is about 2 horsepower. I don't think that a 2 horsepower supercharger is not going to make significant boost.

 

2 Hp = 1491.424 W
power = current x voltage
assuming your altronator is running 14 volt then that thing will be drawing 106.5 amp
If your gonna run that make sure your electrical system can handle it and you have large enough wires so they will not over heat and cause a fire.