Volvo Penta and Danfoss Editron on board two CTVs

MHO-Co’s two new crew transfer vessels (CTVs) – MHO Asgard and MHO Apollo – have been put through their paces, having travelled from China to Denmark. The 12,000 nautical mile journey was a voyage of discovery for Volvo Penta and Danfoss Editron, with the many lessons learned helping to create a tailor-made solution fit for the owner’s requirements.

Two new hybrid crew transfer vessels (CTVs)MHO Asgard and MHO Apollo – arrived at MHO-Co’s headquarters in Esbjerg, Denmark, after making the 12,000 nautical mile journey from China’s AFAI Southern Shipyard. Measuring 34.4 meters in length and with an 11-meter beam, these vessels will be run by operator MHO-Co and service the Hornsea Project 2 offshore wind farm in the North Sea.

Volvo Penta and Danfoss Editron teamed up to develop a fully integrated solution made up of a Danfoss Editron electric drivetrain supported by Volvo Penta variable speed gensets that drive two of the first Electric Volvo Penta Inboard Performance System (IPS) units as well as two D13 Volvo Penta IPS units. The new IPS units have already achieved 1,000 hours of operation before even reaching the customer, giving the teams time to test and adjust the system.

“These systems are a very important first step towards the future of sustainable operations at sea,” says Mik Henriksen, CEO of MHO-Co. “We believe it is our shared responsibility to drive more sustainable solutions in the marine sector, and the best way to do this is through collaboration.”

Learning, adjusting and improving

The journey from China to Denmark has been used to work with the captains and crew to tweak the novel technology onboard. The companies tested different power combinations, such as diesel-electric operation or diesel-only. In Dynamic Positioning System-mode (DPS-mode) fuel consumption is below 20 liters/hr. and can be as low as 17 liters/hr. an exceptional result for vessels of this size class.

From these initial learnings, the teams have started adapting the drivetrain – not just the motors themselves – to all-electric propulsion needs.

Moreover, Volvo Penta created a completely new HMI. To do this, the company worked closely with the captains during the design phase. Volvo Penta took advantage of options offered by the power of plenty, different kind of captain controls, and reading diagnostics differently to develop the HMI.

Before the vessels enter operation, batteries are being installed in Denmark to provide stored power for zero-emissions operation. This system will allow the vessels to operate in zero-emission electric mode for up to eight hours or, in combination with diesel propulsion, to achieve a maximum speed of approximately 24 knots. Using multiple modular generators allows operators to tailor power generation to the operational profile and enhance flexibly.

(Volvo Penta and Danfoss Editron on board two CTVs – barchemagazine.com – September 2021)