QuietTorque™ 45.0LC 48v Liquid Cooled Tri PMAC Motor System


The QuietTorque™ 45.0 LC is recommended electric propulsion for boats up to 50’ (LOA) and 34,000lbs displacement.

Motors are made to order and have a 2-4 week lead time.


The tri-power head motor is engineered by Electric Yacht to the specifications of your boat and built and warrantied by Electric Yacht. The systems are liquid cooled providing for high sustained output, ideal for hybrid applications. Typical battery size is 600Ah+ at 48Vdc. These systems should be be installed by a professional installer or a competent boat owner, but we do recommend the final commissioning be done with a certified electric technician.


  • Motor type: 3 PMAC Brushless
  • Voltage: 48Vdc (nominal)
  • Max. Input Power: 45 kW
  • Cont. Input Power: 38 kW
  • Weight: 250pounds
  • Frame: Anodized Aluminum
  • *Permanent magnet Alternating Current

Standard Features

  • Motor Mounts Adjustable to current engine stringers
  • Throttle Anodized Al waterproof throttle with key & neutral lock
  • System Monitor digital display
    • State of Charge (SOC)
    • Voltage, Current, Power and motor RPM
    • Time to Discharge (TTD)
    • Programmable regeneration, battery type battery size and max power
    • Program throttle RH or LH propeller rotation
  • Shaft coupler 4” flange (Hurth/Borg Warner)
  • 3 x Two position 500A GigaVac power switch
  • 3 x 500amp TE Connectivity vacuum relays
  • Fuse Class-T fuse & holder
  • Heat required pumps and heat exchanger

QT45 Product Data Sheet
QT45 Product Drawing

 WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

 WARNING: Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Batteries also contain other chemicals known to the State of California to cause cancer. Wash hands after handling. For more information, go to www.P65Warnings.ca.gov.


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