The 450 we had would take about 1 hour of running the water-maker to refill the what we used daily, we only had 6 people on board.
You have to run the generator without the a/c on for the water-maker
The boat sailed "heavy". We had 20-25 knot winds and would not point very well. Sails were reefed and we were sailing at about 8 knots max on reaches.