250 kVA Docksite Converter

Docksite Converter 250kVA

The new 250 kVA converters—designed and manufactured in the UK by ASEA/MAGNUS—have now been successfully delivered to Ward’s and Safe Harbour. As an approved supplier, we are proud to support both facilities with the deployment of these next‑generation shore‑power units
Engineered specifically for marina environments, the converters provide a clean, reliable, and tightly regulated shore‑power supply from dockside infrastructure to yachts of all classes. For vessels without an on-board shore‑power converter, they offer comprehensive protection against common mains‑supply issues such as voltage sags, frequency variations, and harmonic distortion, ensuring stable and safe electrical performance while berthed.
The integrated M Controller further enhances system capability by providing real‑time diagnostics, remote configuration, and centralised management
Built on the proven platforms—manufactured by ASEA/MAGNUS —the new 250 kVA models deliver exceptional efficiency and long‑term durability. Multiple units can be connected in parallel to deliver up to 1 MVA of fully stabilised power, safeguarding sensitive on-board systems and providing a consistent, high‑quality electrical supply to even the most technically demanding vessels.

M/Y Limitless 96.25m

Shore Power Converter 50kVA

A 310 kVA Shore Power Converter was retrofitted and commissioned on the iconic yacht Limitless in 2021. To make better use of available space, the system was modularised with transformer and electronics separately installed. The cabinet was painted using Awlgrip to keep the engine room appearance consistent. The electronics cabinet can be converted from sealed water cooling to forced air by adjusting using the front system panel. The Ship's Bus is 440V IT and to maintain high impedance integrity, the output is fully isolated. To improve future customer support, the M controller was installed.

M/Y Spectre 70m

Shore Power 300kVA

M/Y Spectre needed to replace their Shore Power Converter to reliably handle peak power conditions onboard. The converter was installed through a small hatch opening in an aft technical storage location with a restricted head room of 1.1m. The converter has built-in water cooling which is required not only to keep the converter cool, but also the compartment space. It has two independent shore cords to maximise power availability and has 50% system redundancy. An M Controller has been integrated for enhanced monitoring and to enable remote diagnostics for rapid support if required.

S/Y Bliss 36.7m

Shore Power Converter 50kVA

After returning from worldwide sailing, a 50 kVA Shore Power Converter was retrofitted onboard S/Y Bliss to allow connection to shore when berthed in harbour. The system was fully dismantled to facilitate transportation through the engine room door. The system has a hybrid water cooling system where all heat generated is forced through a heat extraction unit, chilled by water. The chilled air is then circulated back into the compartment space. The temperature outlet, controlled by a 3-way valve, can be adjusted through the system's front panel graphic display.

M/Y Madsummer 95m

Virtual Generator 160 kVA / 54 kWh Batteries

Designed and installed during the build, the M/Y Madsummer installation is certified by Lloyds. An energy storage system was installed during the build to improve green credentials and optimise single generator power. The system is 160 kVA with 54 kWh of battery storage, air cooled and relies on forced air ventilation for cooling. The virtual generator has dynamic control, is continually online and delivers power for loads with a high current peak demand, including vessel stabilisers. The converter is installed outside the battery room, which has a large 15" display for battery monitoring and system control.

Netherlands 132m Yacht

Grid/Shore Power 2 MVA and 2 MVA

For this combined Grid/Shore Power Converter and energy storage system, the grid converter was taken from our SP300 platform which utilises the latest 3-level switching. Two independent 1 MVA converter supplies can be switched from the 690V Ship’s Bus to shore and provide a stable 400V 50 Hz supply for utility equipment. Also connected to the 400V Ship’s Bus are two 1 MVA virtual generators which are coupled to 4.8 kWh of lithium-ion batteries. The batteries can peak shave with the ship’s 690V generators or operate standalone for silent ship operation. All the converters have water cooling where heat exchangers, using an inter-cooled water network at sea water temperature, force cool air into the compartment space. 

SY Twizzle 57.5m

CleanNet™ – Preventing light flicker

The owner of SY Twizzle required protection of their lighting network to prevent light flicker. The interior and exterior furnishings have a comprehensive array of lighting for entertainment and relaxation so light flicker was not acceptable. With exhaust burners installed and considerable automation, a clean supply could not be guaranteed so a CleanNet™ Converter was installed to protect and isolate the lighting network with a CleanNet™ Supply. The converter is a high-frequency design that is lightweight and compact. An internal bypass was also installed for automatic and seamless transfer in the event of an overload or fault condition.

S/Y Hetairos 66.7m

Shore Power Converter 80 kVA

The majestic and iconic Hetairos upgraded their Shore Power Converter in 2016 to reduce generator runtime when in harbour. To improve sailing performance, the unit was positioned in the bow compartment space and the system is structurally reinforced to facilitate hull forces under sail. Installed in a restricted location, the system is sealed and water cooled using the ship's chilled water supply. A graphic display was installed in the engine room for monitoring and control.

M/Y Falkor 82.9

Shore Power Converter 1MVA

M/Y Falkor is a newly commissioned oceanographic research vessel operated by the Schmidt Ocean Institute. To reduce environmental impact whilst in harbour, a Shore Power Converter was installed. The system has 10 levels of built-in redundancy with two galvanically isolated and independent inputs, allowing connection to any worldwide shore supply. The converter has a 690V 60Hz output which is isolated from the ship's IT bus and the M controller provides in-depth monitoring of the system which can be used for remote diagnostics as it travels to remote parts of the globe.

M/Y Vava 94m

Shore Power Converter 600 KVA

A 600 kVA Shore Power Converter was installed on board to provide a reliable shore to ship connection. When disconnected from shore the converter operates two independent 300kW bow thrusters. All equipment is installed in the shaft with 100m cable length between converter and bow. Active front-end rectification minimises supply disturbances and maximises generator power availability. The entire system was installed in a compact compartment space with no external ventilation. Water cooling by means of heat extraction was installed to maintain compartment temperature. For reliable transfer from ship to shore the converter synchronises to a live ship bus without any additional power switching or synchronisation procedure. A power limit was also interfaced to the PMS to prevent each separate converter overloading during transfer and includes a power limit load-shedding routine for a smooth transfer of power to generator.