On Thu, 02 Aug 2007 04:29:11 -0700, Pete C
wrote:

Maybe 2x 75A alts and controllers are cheaper than a 150A alt and
controller.

The battery bank in question is close to 800 AH and can not be
recharged from 40 or 50% depletion in a reasonable length of time by a
75 amp alternator. The main cost of the 200 amp alternator is in the
installation work, also an issue with a dual alternator set up.