My opinion is that 12 kW is plenty based on this same data.
In truth, you wont use more than == 6 kW (batteries), and 5.9 knots only needs 9.1 kW.
Real-world:
12 hp engines have run lots of 10 m sailboats, == 35 feet, for decades.
Electric 6-7 kW equates to == 12-15 Hp ICE, they tend to be 2-3 times more effective.
Numerous examples.
Vendor Data: We have a proposal for an Endurance 35 here in the states so I ran our computer model for the using the 48v 20kW system. You may want to consider a more powerful system as your boat is a full keel with a pilothouse profile:
QuietTorque 20.0 Speed & Power
Kts Watts
2.2 480
2.7 960 You should see about 3kts with a 2kW genset
3.4 1920
3.9 2880 Good slow cruising speed for range
4.3 3840
4.9 5760
5.9 9120
-- -hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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