The special feature of the tug is the hybrid propulsion concept. The Bernadus was planned
from the beginning as a hybrid tug. Additional to the main engines of the a MTU 16V4000M63R type with a total output of 4935bhp
two electric motors of the ABB M3LP450 type with each 230bkW were fitted to the shafts. For sailing in the diesel-electric mode
there is a generator MTU 12V 2000 M41B with an output of 800kVA. All three MTU engines have exhaust treatments meeting TierIII
requirements with diesel oxidation catalyst (DOC), diesel particulate filtration (DPF) and selective catalytic reduction (SCR).
For sailing in electric mode the new tugboat have two rechargeable Lithium-Ion battery packs with a capacity of 120kWh each.
These packs - housed in an own air-conditioned compartment - can be charged by the MTU generator, the electric motors on the shafts
or from shore power.
Another special feature are the different types of propulsion concepts. The helmsman can choose in which mode he wants to sail
via a console on the bridge.
- electric mode via battery pack and electro motors
- diesel-electric via generator and electro motor
- diesel propulsion via the main engines
With the batteries the Bernadus can sail 4kts for about one hour. Up to a speed of 8,5kts the electric motors will be powered
by the generator. Above this speed the Bernadus sail with her main engines like a “standard” ASD 2810. The top speed is 13kts,
the bollard pull ahead is 60,2t and astern 55,3t.
All other measurements and outputs are as you can find on a „standard“ ASD 2810.You can find these measurements on the website
of Damen Shipyard.