How many AMP alternator for this application

What do the fans draw?

This is going to be important info for us to have to get you the answer you want. I run a 105 amp Powermaster that runs twin Ford Contour fans, electric water pump, and electric fuel pump, plus lights and a stereo system complete with aftermarket amp and all that. Seems to be sufficient enough for all that. So consider everything else that has to run your electrical as well.