Volvo Penta launches first step towards electric drivetrains for motor yachts

Launching the new propulsion-specific gensets – initially for commercial operators, but no doubt earmarked for an eventual release to the recreational market – will allow shipyards to install modular diesel-electric hybrid propulsion systems.

Paired with a bank of batteries, it will allow a motor yacht to slip silently and emissions-free in and out of the harbour, while providing plenty of self-generated electricity for long-haul cruising.

“This important move towards modular propulsion enables operators to invest in new vessels with the peace of mind that they are built ready and adaptable for emerging alternative energy sources,” Volvo Penta said in a statement announcing the new genset.

“This range of Volvo Penta variable speed marine generator sets are a core part of Volvo Penta solutions designed for hybrid and electric applications. 

“The variable speed marine generator sets make it possible to build vessels with smaller battery banks and charge them while on the move, which makes the switch to hybrid-electric marine propulsion more cost-efficient and accessible today.”

The release of the new genset follows extensive trials in Volvo Penta’s home market, Sweden, to prove the technology was ready to go to market. Volvo Penta was asked when the technology was likely to be extended to recreational vessels, and if it could be retrofitted as an engine upgrade.

At the he new systems will work with a range of engines stepping up from the 7.7-litre six-cylinder D8 producing 190kW of electrical energy to the 16.1-litre six-cylinder D16 producing up to 545kW of electrical energy.

As well, Volvo Penta said these engines were also optimised to run on HVO 100 fuel – recycled vegetable oil – to reduce further the environmental footprint of the boats that use them.

Because these gensets are modular, Volvo Penta can add or remove them to suit a boat’s needs. They are either connected directly to the electric motor powering the boat, or to a bank of batteries that act as a fuel storage system for the electric motor.

The other benefit that Volvo Penta is talking up is that the system will be smart enough to selectively switch off gensets as the energy demands of the boat taper off, such as while cruising slowly, and then switch them back on so a boat can run home before a storm hits.

Volvo Penta said its new modular gensets are the most compact IMO Tier III (meaning they comply with Europe’s tough new marine emissions standards) engines and that because they are water-cooled, they are more efficient and less noisy than alternatives.