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Frugal, Moderate or Bold Energy User?

A 50-55ft Catamaran with 2 people will use 10-20kWh of energy per day. This may be a combination of gas and electric. If it’s all electric as the trend is with induction cooktops and combination air fryer/ oven, then it may be closer to 20kWh of electrical energy per day.

3kW of solar in the aft region of the boat free from general sailing shadows will yield 15 -18kWh in good weather in summer.

The challenge is the 20% of the time when solar yield is poor. Fortunately when the yield is poor, the skipper may be relocating with the engines running. It’s during this time, there is opportunity to capture a ton of replenishment power.

The Secret is Rate of Replenishment Power

Charging at 10kW from the engine gives 5kWh every half hour. Running from two engines gives double that. That means in one hour engine time, on both engines you have recovered 18-20kWh. Thats the same as you would get from solar in perfect weather all day! So run the water maker, spa heater, all electric cooking and electric pizza oven. We have you covered.

Maximum Power is 23kW from Two Units

Hybrid Synchronous Alternator

This is no ordinary alternator. If you are familiar with EV’s, their motors are synchronous with AC to DC inverter drives and run in regen mode.

This hybrid unit is based on a permanent magnet generator. However for precise control over a wide range of speeds, some field excitation is introduced.

In a brushed 48V alternator, a direct current (DC) flows through field windings on the rotor, creating the necessary magnetic field.

In this hybrid synchronous alternator, permanent magnets and electromagnetic field windings are combined to generate the magnetic field. The permanent magnets provide a constant baseline magnetic flux, while the field windings, located on the stator (and NOT the rotor), allow for dynamic adjustment of the magnetic field. This design often eliminates the need for brushes and the digital inverter control changes the excitation and power output very precisely.

Comparison of New HYBRID Technology with Alternator + Wakespeed.

Feature	Hybrid 48V 300A Peak Permanent Magnet Alternator with Scotty AI (HESA)	Traditional 48V 130A Alternator with Wakespeed 500 remote field control.	Winner
“Alternator” Type	Hybrid Excitation Synchronous Generator (permanent magnets + hairpin windings)	Field-excited rotor only	HESA
Rotor Design	16 permanent magnets + excitation windings	Field windings only	HESA
Power Density	1.65 kW/kg (advanced hairpin)	Lower due to round-wire winding	HESA
IP Level	Brushless Motor: IP25. Waterproof Inverter: IP6K9K	Generally Brushed IP23 or lower	HESA
Dual Stator Design	Dual three-phase, 30° shifted	Single three-phase	HESA
Ripple Current Reduction	Significant (30° phase shift)	Higher ripple	HESA
Noise Vibration Harshness Performance	Optimized (low ripple and torque smoothness)	Higher NVH	HESA
Efficiency	Higher (permanent magnets + hairpin winding)	Lower (field-excited losses)	HESA
Fault Tolerance	Dual stator allows operation in partial failure	Single stator, no redundancy	HESA
Peak Generator Power	12 kW	6.2 kW	HESA
Peak Efficiency	≥85%	60–70%	HESA
Power at Idle (engine ~600RPM)	3.0kW	300-500W Typically	HESA
Continuous Power Hot	≥5.5~7.0kW kW	5~7.0 kW	HESA
Maximum Speed	18,000 RPM	~8,000–10,000 RPM	HESA
Operating Temperature	-40°C to 105°C	-20°C to 80°C	HESA
Lifetime Expected	10 years, 300,000 km, 8,000 hrs	5–7 years, 150,000–200,000 km	HESA
12V and 48V Isolation Negative side Earth isolated	Yes	No	HESA
Integration with Factory 12V or 24V Alternator	Full Integration for added power as solar backup at idle	None	HESA
Diagnostics and Protection Of Load Dumps	Inverter/motor diagnostics, 100% load dump protection	Limited and depends on Battery	HESA
ISO 26262 ASIL B Automotive Safety Standard	Compliant	Not compliant	HESA
Insulation Grade	Grade H (180°C)	Grade F (155°C)	HESA