We split the city passenger ferry market into three segments based on their type of operations and the speed:
- Slow-speed: Ferries crossing waterways on short routes with high frequency
- Medium-speed: Ferries operating along waterways with several stops
- High-speed: Ferries operating on longer distances and few stops
Slow-speed ferries (up to 20 km/h) can easily be retrofitted while medium-speed ferries are more weight sensitive and might be replaced to meet higher demands. Many shipyards can today offer carbon fibre catamarans for this purpose.
High-speed ferries (over 40 km/h) consume a lot of energy and are therefore very sensitive for hull weight and design. BB Green’s ASV hull needs 40 % less power than conventional catamaran hulls. We can also offer other sizes of ASV ferries.
GCF develops and integrates all types of inboard electric drive lines. The electric drive line can consist of a conventional propeller shaft or high-speed drives (> 30kn) like the Volvo Penta IPS drives. For high speed vessels like the BB Green GCF has adapted the Volvo Penta IPS unit and converted into a 100% battery electric drive line. For the serial version of the BB Green vessel new improved 0propulsion motors and motor controllers have been sourced resulting in dramatic weight reduction of the electric motor ( 70%). GCF also offers serial hybrid solutions for ferries and supply vessels.
When designing a battery pack for a ferry, the charging facilities must be considered. The type and size of the battery together with the power capacity of the grid determines the charging time and thus the time schedule for the ferry. We provide charging stations for 64 Amp slow charging over-night up to 1 600 kW supercharging for some 10 minutes from a floating pontoon and with automatic connection.
ENERGY STORAGE SYSTEMS
The marine industry is recognizing the potential for Energy Storage Systems (ESS) on vessel generator systems with variable operating profiles, fluctuating loads to provide efficiency and reliability improvements and thereby reducing fuel consumption, emissions and maintenance costs.
Recent technological advancements and continuing cost reductions of Lithium-ion batteries with high specific energy in kJ/kg and ability to support cyclic operations are the driving force behind this technology. Furthermore, operators are giving more priority to engine maintenance schedules, ESS reduces the number of operating hours. With ESS, vessel generators can deliver lower life-cycle costs, greater uptime, improved reliability and higher availability. ESS solutions can provide key benefits in marine industry:
- Running lower numbers of generators online at higher load
- Reducing thrusters load ramp limits and enabling quickly available thrust force. This enables vessel fast responsiveness and enhances maneuvering capabilities, thus increasing safety.
- Reduces operating costs due to optimised fuel consumption and lowers generator maintenance.
- Reduces the risk of blackout by operating ES as Uninterruptable Power Supply (UPS), and in case of blackout enables quick power system recovery, faster than when emergency generators are used.
- ESS solutions can reduce fuel cost for generators by as much as 25% and maintenance costs up to 50%