Supercapacitor Sizing Calculator

A supercapacitor is an energy storage component used in power backup and burst-power applications — the Supercapacitor Sizing Calculator determines the exact capacitance needed to meet your system's energy demands. Enter your required power, backup time, and voltage configuration (system rated, working max, and working min), then select your supercapacitor type, discharge type, and advanced settings like cell voltage and capacity derating. You'll get the required capacity in Farads along with energy storage, maximum current, cells in series, and module voltage.

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Required Capacity

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Energy Storage

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Maximum Current

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Cells in Series

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Module Voltage

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Frequently Asked Questions

What is the difference between EDLC and LIC supercapacitors?

EDLC (Electrochemical Double Layer Capacitors) use activated carbon and offer high power density with symmetric voltage operation. LIC (Lithium-Ion Capacitors) combine lithium-ion battery technology with supercapacitor benefits, providing higher energy density and asymmetric voltage characteristics.

How do I determine the minimum working voltage for my application?

The minimum working voltage should be set based on your system's operational requirements. Generally, it's 60-80% of the maximum voltage to ensure adequate energy extraction while maintaining system stability.

What is capacity derating and why is it important?

Capacity derating accounts for real-world performance variations due to temperature, aging, and manufacturing tolerances. A 90% derating factor provides a safety margin to ensure your supercapacitor meets performance requirements over its lifetime.

Should I choose constant power or constant current discharge?

Constant power discharge is typical for backup power applications where you need steady power output. Constant current discharge is used when your load draws a fixed current regardless of voltage changes.

How many cells do I need in series for my voltage requirement?

The number of cells in series is calculated by dividing your system voltage by the individual cell voltage. For example, a 12V system using 2.7V cells would need approximately 5 cells in series.

What factors affect supercapacitor sizing calculations?

Key factors include required power output, backup time duration, operating voltage range, temperature conditions, discharge type, and safety derating factors. Each affects the final capacity and configuration requirements.

How does ESR derating affect my supercapacitor selection?

ESR (Equivalent Series Resistance) derating accounts for resistance increases due to temperature and aging. A 2x derating factor is conservative and ensures adequate current delivery capability throughout the supercapacitor's life.