OK, here is what we ended up doing:
Four 150 Watt panels, two each side of the boom.
The boat has two house banks, one feeding lighting etc, the other feeding navigation instruments etc. There are no dedicated engine cranking batteries. A most unusual configuration, but then the boat was built in France... The genset does have it's own starting battery though.
We have connected two panels to each of two Blue Sea MPPT controllers, one for each of the two battery banks. The Kiss wind turbine and a Tristar 60 with a 600W 12V heating element in the water heater is connected to the starboard battery bank. A blue sea battery combiner capable of passing a maximum of 60 Amps parallels the two banks when the battery voltage on either bank is above 13V.
In addition, there is a two bank charger running from the diesel genset and a factory installed battery combiner that operates from the main engines, switching on when either engine is running. (Connected to the engine ignition and charging lamp.)
We got the panels up and online today. The Tristar and dumpload and the battery combiner will be installed tomorrow.
I decided against just using two Tristars in dumpload configuration to control everything because a malfunction while the boat was unattended for more than a day or two could lead to cooking the batteries. In the current configuration, a malfunction of a charge controller will simply lead to a reduction of charging current.
A malfunction of the Tristar in a windy period could still cook the batteries, but it's unlikely the boat would be left unattended for any length of time without shutting down the wind turbine.
PS. Wish I had room for those four beautiful 150W panels on my ketch...
Owen