ES200 Yacht Energy Storage

Improved generator efficiency and emissions

Generators operating outside of their efficiency zones often cause increased fuel consumption, leading to higher emissions and unexpected maintenance issues. By introducing Energy Storage, Magnus can maintain the generator operation inside the efficiency regions, saving time, money and the environment.

Seamless storage of energy

As the ship's load fluctuates, excess generator power can be stored by the energy storage system. Stored energy can then be used when power demand exceeds that of the generator. Using the energy storage system during peak periods prevents additional generators from starting. Operating the ship in this configuration offers significant fuel savings which would otherwise have been lost. Additionally, maintaining the generator at its nominal load keeps generator run hours, maintenance and exhaust fumes to a minimum.

Value and performance

A proven and reliable power quality platform that provides seamless system integration and battery control. Autonomous control which includes online synchronisation and parallel load-sharing with generators, provides seamless bi-directional transmission of power during operation.


Virtual generator mode

The Virtual Generator operating mode is unique to the ES200 power electronic platform and mimics the behaviour of a generator. Interfacing the ships generator(s) with a balanced, three phase voltage delivers a true dynamic system with bi-directional connectivity. The benefit of this is a natural connection between  the generator(s) and the energy storage system.

In addition, physical inertia is modelled by the system, providing  a stable response to the grid frequency. The ES200 Virtual Generator can control its own voltage and frequency, enabling  it to create an island grid should a problem occur with the generators or shore supply. In such conditions the ES200 will support the load without disturbance.
The complete package

The Magnus ES200 is the entire package and includes the batteries, inverter and energy management system. Charge and discharge flow rates are determined through generator load inputs.


ES200 benefits, features and options

Key features

  • Peak Shaving – delivers power to the grid when peak demand is high. Prevents additional generators coming online, thereby lowering fuel and maintenance costs
  • Load Levelling – store energy when demand is low and deliver energy when demand is high
  • Spinning Reserve – meets shortfalls, supplying backup power during a loss of generation or silent ship operation
  • Design maximises battery life expectancy.

Battery specification

  • Lithium-ion manganese oxide
  • Cylindrical case provides high strength resistance against vibration and shock (stainless steel and wound electrolyte)
  • Three times nominal power charge and discharge performance
  • Battery management unit monitoring voltage, temperature and current
  • Operating temperature -20 to 50°C
  • Efficiency >96% (end of life)
  • 1.7kW/h = H:151 x W:228 x D:475mm 23kg
  • 102Watt hours/litre 76Watt hours/kg
  • Minimum life expectancy 8000 cycles, depth of discharge 100%
  • Batteries Lloyds AIP approval.

Package includes

  • Battery management unit to monitor batteries and includes safety shut off
  • Energy management unit with graphical display for control and monitoring
  • 110V battery string isolation for safety
  • Current protection from converter and energy storage
  • Standalone operation from ships PMS  • Customer interface via ethernet connection
  • Gas detection CO and CO2.
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