The Electric Yacht Company has spent several years developing the second generation QuietTorque system. The engineering goal was a simple reliable system that could beadapted to the many different re-power needs of our clients. For boats from 25ft to 55ft with displacements form 4000 pounds to 40000 pounds, the QuietTorque system focuses on simple, reliable, easy to install, and durable system design. The QuietTorque system is light weight, well-engineered, well-built, and comes with a three year warranty. Unmatched in the North American market it has become the standard for repowering day sailors to ocean crossing cruisers. Note that the QuietTorque 20.0 is the only 48v 20kW system on the market. Let’s look at the parts of the system and how they work and what separate Electric Yacht from the rest the Marine propulsion vendors.
• The Electric Yacht built throttle has forward and reverse along with lock in neutral. In neutral with the key in the on position, there is automatic regeneration when the boat is reaching appropriate speeds. Bankable at over 6kts. Multiple controls available for multiple helms. Other select electronic controls can be used if desired.
• The Electric Yacht exclusive programmable monitor has a backlight that can be adjusted for night vision. The intelligent unit coupled with the Electric Yacht control module mounted with the Sevcon controller allow for set up and reprograming of the motor. From the helm, you can modify battery type, battery size, throttle direction / throw, and regeneration setting (for sailboats). Clearly seen are state of Charge (v), power draw (amp), regeneration (kW), % of battery charge, hours remaining under power, motor RPM (before propeller reduction), and motor on/off state. We have added audio alarms for change of power (on/off), battery low status, and other alarm state. The system can have multiple monitors for multiple helms.
• The frame is the heart of the system and allows significant gearing options and makes the motor installation simple. The frame has two thrust bearing built in on each side of the shaft pulley. The high quality toothed Gates belts transfer power to the propeller shaft. The motor is normally mounted aft on the frame and above the shaft. The prop shaft is electrically isolated. The Sevcon controller is mounted forward on the frame with the Electric Yacht control module above it. Besides providing a rigid platform for the motor, the frame is a significant heat sink and as such increased the reliability of the system. The Sevcon controller and Electric Yacht module can be mounted elsewhere in the engine compartment to reduce the physical size of the motor at the shaft.
• Electric Yacht custom builds the coupler as a stainless steel keyed clamshell unit that fits our 1 inch shaft on the motor side and can accommodate .5 to 1.5 inches on the shaft side. Electric Yacht will be offering a traditional bolt on unit that can use traditional shaft coupler of 3, 4 or 5 bolt pattern. Power the Electric Yacht control module. From the helm, the key activates the relay and powers the Sevcon motor controller. This is the electro-mechanical on/off switch for the Electric Yacht motor.
• The flexible mounting system provides significant ability to orient the motor in the engine compartment. Note that the Electric yacht motor does not need to be mounted on shock absorbing “engine mounts”. Combined with the flexible frame mounting points, the system allows forward/aft, up/down, and horizontal adjustment. Makes for easy alignment.
• The Tyco relay is a 12v sealed relay. 12v Power is taken off the battery side to
• We use quality ABYC/CG approved Blue Seas power switches to activate the 48v
• The system included an ABYC/CG required T-fuse that should to be installed as close to the positive terminal of the battery pack.
• There are several 48/72/96v to 12v dc to dc converters available. This Sevcon unit is reliable and will provide a 300w trickle charge to the 12v batteries. It should be installed with a fuse and on/off switch so as to not interfere with on board 12v charger.