Voyage has two generators in the 52 and 58 because they use a very small generator. They use. 6kw in all their boats. The 6kw was fine in a 44 foot cat with a total of 23.5 BTU's of AC. It was really marginal in the 50 footers even after adding a auto load shed system. Most cats in the 45 foot range have a 9k genset and 50 footers usually are 11.5 or more.
George