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Maxwell Technologies unveils 51-Volt ultracapacitor module for hybrid buses

Maxwell Technologies, a leading developer and manufacturer of ultracapacitor-based energy storage and power delivery solutions, has introduced a 51-volt (51V) module, the newest addition to its ultracapacitor product offerings for rugged applications. The 51V module uses Maxwell’s leading 2.85V, 3,400-farad (F) ultracapacitor cell to deliver the company’s highest available energy and power density.

As durable and efficient energy storage solutions are in strong market demand, Maxwell’s 51V module provides a self-cooling system solution that helps to optimize the performance of hybrid buses and other high-duty cycle applications.

Additional features of the 51V module include:

  • Incorporates Maxwell’s proprietary DuraBlue Advanced Shock and Vibration Technology (earlier post) into the design, which provides three times the vibrational resistance and four times the shock immunity of previous ultracapacitor-based competitive offerings.

  • Meets and exceeds the industry’s highest vibration (ISO 16750-3, Table 12) standard for ultracapacitor modules and has an IP65 environmental protection rating.

    (The IP Codes (international protection or ingress protection) are defined in international Standard IEC 60529 to classify the degrees of protection provided against the intrusion of solid objects including dust, and water in electrical enclosures. The first digit indicates the level of protection against solids from 0 (not protected) to 6 (dust tight). The second digit indicates protection against water, from 0 (not protected) to 8 (immersion beyond 1 meter). IP65 indicates dust tight, and protected against jets of water.)

  • Includes an active cooling system, which improves the module’s maximum continuous current rating by nearly 90 percent and ensures optimal performance even in extreme temperatures, down to minus 40 degrees and up to 65 degrees Celsius.

  • Has an identical mounting pattern to Maxwell’s current 48V module.

Hybrid bus systems need to perform reliably, even when exposed to harsh conditions such as rugged roads and extreme temperatures. The 51-volt module’s ability to perform during demanding high duty-cycle applications reinforces our ongoing commitment to deliver superior performance and value to our customers.

—Dr. Henning Hauenstein, vice president, strategy and marketing of Maxwell Technologies



These will blow away lithium batteries someday.


Those excellent rugged super caps have a long way to go to reach 1/10 of the performance of new graphene enhanced lithium batteries.

Could do well for energy recuperation on heavy electrified trucks, buses and locomotives?


Supercaps are good for regenerative braking and take off, they do not have the energy to replace batteries in BEVs.

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