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Maxwell Ultracapacitors: Enabling Energy's Future


Ultracapacitors store and discharge energy very quickly and are being used in thousands of different applications and considered in a host of future applications. Ultracapacitors complement a primary energy source like an internal combustion engine, fuel cell or battery, which cannot repeatedly provide quick bursts of power. The future horizon looks immense for ultracapacitors as a green, alternative energy resource.

Where Ultracapacitors Work

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Harvest power from regenerative braking systems and release power to help hybrid buses accelerate. Harvest power from regenerative braking systems and release power to help hybrid buses accelerate. Used in "blade pitch" systems and help regulate voltage to the energy grid. Used in "blade pitch" systems and help regulate voltage to the energy grid.
Reliably start semi-trucks in cold weather or when batteries are drained from repetitive starting or in-cab electric loads. Reliably start semi-trucks in cold weather or when batteries are drained from repetitive starting or in-cab electric loads. Capture power as they lower, then provide burst power to assist in lifting loads. Capture power as they lower, then provide burst power to assist in lifting loads.
Provide starting power in start-stop systems and help power electrical systems, starter systems and power steering in hybrid and electric cars. Provide starting power in start-stop systems and help power electrical systems, starter systems and power steering in hybrid and electric cars. Provide energy to data centers between power failures and initiation of backup power systems, like diesel generators or fuel cells. Provide energy to data centers between power failures and initiation of backup power systems, like diesel generators or fuel cells.
Capture power from regenerative braking systems and release power to accelerate and keep electric trains moving during power failures. Capture power from regenerative braking systems and release power to accelerate and keep electric trains moving during power failures. Power grid, solid-state memory drives, electronic toys – any application that requires quick discharge and charge of power.Power grid, solid-state memory drives, electronic toys – any application that requires quick discharge and chargePower grid, solid-state memory drives, electronic toys – any application that requires quick discharge and charge of power. of power. Power grid, solid-state memory drives, electronic toys – any application that requires quick discharge and charge of power.
Open aircraft doors in the event of power failures. Open aircraft doors in the event of power failures.    

How Ultracapacitors Work

PRIMARY ENERGY SOURCES like internal combustion engines, fuel cells and batteries work well as a continuous source of low power. However, they cannot efficiently handle peak power demands or recapture energy in today's applications because they discharge and recharge slowly.


ULTRACAPACITORS deliver quick bursts of energy during peak power demands, then quickly store energy and capture excess power that is otherwise lost. They efficiently complement a primary energy source in today's applications because they discharge and recharge quickly.

How Ultracapacitors Work Primary Energy Source

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Backup Power   +   Regenerative Power   +   Burst Power   +   Quick Charge   +   Cold Starting

Growth of Maxwell Ultracapacitors

Maxwell Technologies has grown to be the leading global supplier of ultracapacitors.

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Maxwell Corporate Brochure (PDF)

Maxwell Ultracapacitors Overview (PDF)