A new patrol boat just launched by Ribcraft in Dubai is powered by a unique hybrid electric system supplied by Transfluid and Elcome International.
The two companies collaborated to design and install the cost-effective diesel-electric system for the nine-meter Ribcraft professional-grade rigid-hull inflatable boat. A Middle Eastern customer required a Patrol RHIB intended for the surveillance of the environmentally protected areas with zero environmental footprint, while at the same time being able to operate at speeds in excess of 40 knots for safety and security missions.
Elcome was responsible for all aspects of specifying, integrating, installing, testing and commissioning the Transfluid hybrid system, which can operate in an electric-only, engine-only or booster mode. All systems and equipment on board were specified and designed in collaboration with Ribcraft’s team of technical designers and naval architects.
The system architecture, developed by Transfluid, incorporates a clutch and transmission that enables fast and seamless switching between modes. When the clutch is disengaged, the vessel runs solely on battery power, providing emission-free and silent running. When in “engine” mode, the clutch is engaged and the twin Volvo Penta D4 DPH diesels propel the boat and can also recharge the batteries if required at the touch of a button. In the “booster” mode, the battery-driven electric motor and diesel engines deliver maximum thrust for powertrain.
The boat can operate efficiently and silently in the electric mode when patrolling at slow speeds or in protected waters, and surge quickly to high-speed operation as needed.
The diesels can be brought online while running on electric power to recharge batteries as needed to extend the operating range. The lithium batteries can also be charged from a shore power connection when at the pier.
The completely integrated turnkey solution utilizes a proprietary electronic controller that communicates with all components through a CAN Bus protocol. The hybrid modules, batteries and electric motors are approved by DNV.
The three operational modes enable the boat operator to use smaller, less expensive and more efficient diesel engines, yielding substantial savings in fuel consumption and longer maintenance intervals without sacrificing performance. The system also provides more flexibility for boats operating in and out of environmentally protected areas, while delivering improved working conditions for the crew, with no diesel fumes or noise when running in the electric mode.