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Energy Storage System

cBull Energy Storage System will make sure generators are optimized to run at optimum load. This allows for fewer engines connected to the switchboard as peaks in power demand are absorbed by the batteries and will result in 15-20% reduction in fuel consumption, maintenance costs, CO2 emissions and increases redundancy.

The operation mode of ESS can be controlled automatically by the embedded Energy Management System or by the operator.

The main operation modes are:

  • Hybrid Mode

  • Peakshaving Mode

  • DP Mode

  • Harbor Mode

The cBull Energy Storage System (ESS) is beneficial to use when either the power demand on the grid is not aligning to the power production capabilities of the grid or the load ramp of the different grid loads exceeds the power plant capabilities.

Another use case is where there a need for spare capacity in case there is a sudden reduction of power generating sets on the grid due to a shutdown of a generator.

For DP vessels the cBull ESS can also be used as a backup source of power allowing DP operations with closed bus-tie and a reduced number of live generators.

We have the option to deliver complete turn-key projects for the cBull Energy Storage Systems including electrical and mechanical installation. We can also do pre-install of cables and complete simulations of the power systems to ensure short commissioning time to reduce time the vessel is out of service for the installation.

Island Clipper

Picture by Stig Silden

Island Offshore selected a cBull Energy Storage System with a large battery pack of 875 kWh for the vessel Island Clipper

The system can deliver a power output of 1800 kW, equal to one of the existing generators onboard.

This facilitates the use of the ESS as the backup source of power in DP operations, instead of running two generators.
This significantly reduces the fuel consumption and generator running hours.

We have done tests in DP where the ESS is the only source of power, and in an incidental situation causing discharge of gas from the rig, we can switch to fully electric operation and be able to move away from the gas exposed area with the batteries as the only source of power. This removes a potential ignition source and sure safer operations.

In transit the cBull ESS assists with immediate and effective power, this reduces the need of starting additional generators for peak loads. The generators do the majority of the work, and the ESS absorbs the variations, this results in a smooth sailing without the need for extra power to handle head-sea.

Island Clipper is also equipped with a cSnake Shore Connection System to be used in harbors that are equipped with this infrastructure, if there is no possibility for shore connection the ESS can run "harbor mode". The consumers then run on batteries and when they are discharged the generator automatically starts to recharge the batteries. In "harbor mode" the generators run on a optimum load level (85%), this gives improved combustion and cleaner emissions.

With batteries in this mode we save approximately 15 generator hours every day and it is clear that this solution has both environmental and economical benefits.

When all harbors are equipped with shore connection capabilities the need for running generators while in port is eliminated.

We are very happy with the cBull Energy Storage System from HPS.

Stig Silden

Captain - Island Clipper


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