Catch The Ultrawave



The energy supplied by waves is quite random and inconsistent, but ultracapacitors can smooth current power delivery and turn this sea-generated, complex and irregular wave pattern into a continuous “ultrawave” and help catch more energy. Without ultracapacitors, this energy would be lost.


Thanks to Skeleton Technologies’ ultracapacitors it is possible to harness the energy of the random power profile of the ocean’s waves and feed it as an increase of energy into the grid.solution

SAMPLE SYSTEM:sample-graph
SkelGrid 3.69 MWs

The diagram depicts a plug-and-play system where the ultracapacitors act as a buffer to carry the peak and RMS energy from the wave power profile and to the grid, resulting in a higher RMS power grid profile. Thanks to the ultracapacitor bank this extra energy is used, otherwise, it would simply not reach the grid.

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* Some inverter and energy management system limitations might apply.


Marine & offshore applications for ultracapacitor energy storage

The maritime industry is already the most efficient form of transportation in terms of shipping goods and conveying passengers. New regulations are in place, however, to further reduce fuel consumption and greenhouse gas emissions for marine vessels.

The answer is electrification and hybridization of propulsion systems. Hybrid ships and boats have a conventional (typically diesel) fossil fuel engine and an electric motor, but when the electric motor is in use, no diesel is burned nor greenhouse gasses released into the atmosphere.

There are a number of applications on vessels where ultracapacitors can offer significant advantages:

  • Peak load shaving
  • Active heave compensation
  • Generator gradient control
  • Backup power bridging
  • Electrical winches
  • Cranes & hoists
  • Dynamic positioning
  • UPS
  • System-level efficiency enhancement

The benefits of energy storage in marine applications are clear:

  • Decrease in maintenance and operating costs of generators
  • Decreased fuel consumption and emissions
  • Increased efficiency
  • Higher operation flexibility
  • Improved redundancy
  • Improved safety

Ultracapacitor energy storage for marine applications

Use case: Peak power shaving

Almost all power profiles are dynamic - in addition to the base power, a short period of peak power has to be covered. Ultracapacitors are the ideal method to fill the gap between base and peak loads.

Base load: 300 kW
Peak load: 1 000 kW

Ultracapacitor energy storage for marine applications

Generators typically have poor step response, which results in:

  • Additional generators running in reserve with a light load. Running a 1 MW generator lightly loaded to cover the base load is very inefficient.
  • High running hours and maintenance costs.

In addition, non-optimal operating area for generators increases fuel consumption and emissions.

By using ultracapacitors you can decrease the number of generators needed and cut down on running hours and maintenance costs.

Use case: Generator gradient control

Generators can typically handle step changes up to 30%, and over three times the number of extra generators are needed in reserve to cover peak power.

It's not unusual to run gensets at 10-15% load, but with a power reserve 6-10 times that.

Ultracapacitors can smooth the power gradient and reduce the required generator reserve significantly.

Ultracapacitor energy storage for marine applications

Example: 7 MW Drawworks

  • Step change: 7 MW
  • Conventional system: up to 30 MW generator power reserve
  • With ultracapacitor gradient control only 7 MW power reserve needed


Using ultracapacitors enables:

  • Turning of gensets instead of keeping them in reserve to cover short power peaks
  • Lower OPEX

Use case: Spinning reserve

Providing short timeframe spinning reserve with generators is inefficient and expensive. An ultracapacitor energy storage system can provide the same benefits of redundancy, instantly picking up the load when required, and preventing network outages - all while lowering costs significantly.


Using ultracapacitors enables:

  • To turn of the gensets instead of keeping them running in reserve to cover short power peaks
  • Lower OPEX

Use case: Shaft generator load transfer

Load transfer between shaft generators and auxiliary generators can be dangerous in demanding conditions, leading to:

  • Decreased efficiency
  • Increase in running hours and costs

Ultracapacitor energy storage for marine applications

Ultracapacitor energy storage provides safe and effective load transfer between the shaft and auxiliary generators by operating as dynamic energy storage used to synchronize unstable supply.

Using ultracapacitors enables:

  • Improved safety
  • More flexibility in operations
  • Lower OPEX

Use case: Active heave compensated 20t winch (continuous operation)

Active heave compensation is an application where ultracapacitors shine. The high power, high number of lifecycles, practically instant charging and discharging, high reliability, and tolerance for extreme weather conditions provide great benefits.

Ultracapacitor energy storage for marine applications

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Products used in maritime

Industrielle Zellen Module 

Why Skeleton's ultracapacitors are ideal for this market

Fuel savings.

Electric motors can be used at low speed locations such as harbors or at other times when high power is not necessary.

Reduced greenhouse gas emissions.

Electric motors emit no greenhouse gasses and significantly reduce the combined emissions of marine vessels.

Lower operating costs.

Ultracapacitor-based energy storage systems have a significantly longer lifetime and are more reliable than traditional li-ion batteries. Ultracapacitors also work together with batteries to by reducing the strain engine starting causes on batteries, thus increasing their lifetime and reliability.