Light Rail: Challenges, Risks and the Benefits of Ultracapacitors

As energy prices continue to rise, consumers and manufacturers of transportation vehicles are embracing alternative ways to conserve and reduce costs, and light rail is no different. The designs and uses of ultracapacitors make the technology a reliable technical solution for light rail. The primary options for this application are rolling stock (800 – 1500V) and way side storage (≤ 1000V), each with their own set of challenges and risks. Regardless of the application there are certain requirements expected from the ESS, in this case ultracapacitors.

The biggest challenge of light rail is the overall system costs and thermal capacity. The ESS must deliver high system capacitance and voltage (up to 1500V), low system equivalent series resistance (ESR), and a sustained high current/energy throughput.

Fortunately, the makeup of an ultracapacitor helps address these challenges (among others) with efficient throughput – the key to successful energy storage within in the rail market. Ultracapacitors charge and discharge quickly, making them ideal for voltage support needs and recovering energy that would otherwise be lost in light rail transportation. Ultracapacitors allow for high duty cycle and a sustained high current throughput, which is integral to energy efficiency and achieving the optimum level of energy regeneration.

Our recently launched iMOD X-Series™ is a new series of module systems containing features built to improve an ultracapacitor’s efficiency and counters the risks posed by light rail and other applications through advanced cell, module and overall system design. It offers a common, single-piece extruded housing for application across all of its axial ultracapacitors. The iMOD X-Series’ packaging helps to lower costs by minimizing material requirements and consuming up to 50 percent less volume than systems using competitor modules. It addresses unique thermal characterization as well, allowing every cell to be in thermal contact with the outside of the housing, thus resulting in even aging of the cells to create a longer lasting, more reliable product.

In April, we announced our ultracapacitors have been fitted to the railway wayside traction power on the Long Island Rail Road (LIRR) in order to facilitate better acceleration, greater energy efficiency and reduced energy consumption. With the aid of efficient throughput, proper system design, and improved packaging methods, Ioxus has helped the LIRR reduce energy consumption by up to 30 percent.

- Any questions or comments? Feel free to send me an email ( or reach me on Twitter at the@Ioxus handle.

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  • Ioxus uSTART® Battery Replacement for Heavy Equipment Increases Starting Reliability

    ONEONTA, N.Y., April 2, 2019 /PRNewswire/ -- Ioxus, Inc., a leading developer and manufacturer of ultracapacitors and energy storage products, announced today that the 24V uSTART® battery support system is now being offered as the heavy equipment industry's only drop-in replacement product that needs no special wiring. Using two group 31 batteries in series, with one 24V uSTART in parallel, users can replace their 4D battery in heavy equipment.

    The ultracapacitor-based product is designed with smart power electronics to assist in starting engines up to 50L for large off-road equipment.  Using the available Smartphone Bluetooth app, once the uSTART is connected to the batteries, users can look at the voltage of the batteries, the charge level of uSTART, initiate a jump start without connecting any wires, or put the unit into maintenance mode for safe removal or repairs.

    The goal of the uSTART system is to provide the vehicle with a start, no matter the condition of the existing batteries or external temperature. If the batteries run too low duread more...

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