- Seaonics developed Ocean Charge, a new offshore charging solution for electric SOVs.
- Successful in-port and offshore prototype testing has proven the solution’s feasibility.
- Charging points can be installed on turbines, eliminating the need for ships to return to port.
Seaonics’ Ocean Charge technology underwent successful in-port testing with a diesel-electric hybrid Construction Service Operation Vessel (CSOV), owned by Rem Offshore. The prototype testing then moved offshore, using a wind turbine for charging with a cable reel, winch, and control system. This testing has led to confidence in the solution’s commercial potential, reports Engineer Live.
Charging Power and Technology
Bjørnar Huse, sales manager of offshore energy at Seaonics, explained that the system used a 10-year-old turbine to charge the CSOV.
“At 10 years old, the turbine is one of the smallest offshore but the prototype proved it is possible to install the Ocean Charger on an existing turbine and charge an SOV from day one, using 11 kilovolt (KV) current delivering 6 MW of charge. Apart from a handful of improvement points to fix, the concept and control system are complete and the product is available for sale as is. We’re first in the market and already in talks with wind farm owners,” Huse said, highlighting the use of an 11KV current delivering 6 MW of power.
Although there are minor improvements to be made, the system is now ready for the market.
Customization for Wind Parks
The Ocean Charge system will need to be customized for different wind parks, as power currents vary between locations. Seaonics is already in discussions with wind farm owners to explore these options.
Supporting Zero-Emissions SOVs
This technology will allow shipbuilders to create zero-emission SOVs that can charge offshore, reducing the need for diesel fuel. Although diesel is still needed for backup power, the hybrid models significantly reduce diesel consumption.
Charging directly at wind farms, rather than returning to port, saves both time and energy.
Efficient Charging Process
A full charge for an SOV can be completed in three to four hours at 6 MW per hour. It typically consumes between 20-25MW per day.
To avoid battery damage, it is recommended to maintain a charge between 50% and 80%, with ad-hoc charging throughout the day to prevent the battery from dropping below 50%.
Shift Away from Floating Buoys
While it is mechanically easier to install charging points on floating buoys, wind farm owners are moving away from this method due to high costs and complex logistics. Installing charging points directly on turbines has proven to be a simpler and more cost-effective solution.
Industry-Standard Connector Plugs
Seaonics’ system uses industry-standard connector plugs, allowing vessels to charge both offshore and in-port.
Power integration is managed through vessel switchboards, which adjust charging voltage as needed. This versatile product can be installed on any structure.
Transformer Requirements
The solution may require two transformers because most wind parks use higher voltages, such as 66KV or 132KV. Onboard transformation is possible but could raise safety concerns due to the high voltage involved.
A more cost-effective approach would be using 11KV for charging.
Advanced Cable Handling System
The system uses a crane equipped with a gripper to attach the charging cable, even in rough weather conditions. The automated process eliminates manual operation, improving accuracy.
A slack cable allows vessels to move up to 20 meters without damage, and a DP safety system automatically releases the cable in emergencies.
Watertight Cable Cover
Seaonics has developed a watertight cover for the charging cable to prevent damage if the cable accidentally submerges.
The handling system ensures the cover opens when charging begins and closes when charging is complete.
Tailored Solutions for Wind Parks
Customization for specific wind parks is expected to take a few months. Wind farms installing this technology in the next two to four years can either integrate it into newly built vessels or retrofit existing ones.
Installing charging points before turbine deployment will further streamline operations.
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Source: Engineer Live
