On top of this, the Dutch utilise the fact that an electric motor is similar in design to a generator. While sailing, the prop rotates and supplies electricity to the batteries via the electric motor, which acts as a generator. Although this costs a bit of speed, it is a very environmentally friendly way of generating energy. When the batteries are full, the electronics release the propeller and it turns under water with very little resistance. However, the use of a folding propeller is prohibited by the system.
Mastervolt offers three serial versions: As a pod in a unit for flange-mounting to the fuselage, with a saildrive or for installation with a shaft. The power range on offer extends from 3.5-20 kW. The brushless motors are virtually maintenance-free, an advantage over conventional drives.
If the energy generated by sailing, solar cells or wind generators is not sufficient, a generator is available. It provides an almost unlimited range. Advantage: The electricity generated is also available for electric cooking, air conditioning or the on-board PC, for example, and the installation location of the generator on the boat can be freely selected. According to Mastervolt, the new options have met with great interest from boat designers: "They allow greater flexibility with regard to the location of the components, which improves the possibilities for interior design," says Marc Persoon, Marketing Manager at Mastervolt.
The sticking point of such a system is still the batteries: conventional lead-acid batteries are too heavy for the required power and work too slowly in terms of current consumption and output in the high current range. Li-ion batteries are much better, but also (still) much more expensive.
Prices start at 10,324 euros for the 5 kW Sail Master (Saildrive) and at 6010 euros for the Hybrid Master (shaft system).
