Comparsion with other Batteries
- Charge & Discharge
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Ultracapacitor (Ultracap) is an energy storage device that has different charge & discharge characteristics compared to rechargeable battery. The Rechargeable battery has voltage plateau region but Ultracapacitor(Ultracap) shows only linear relationship with voltage for charging and discharging.
The linear relationship with voltage can be changed to constant voltage by simply connecting DC-DC converter. The amount of energy stored in ultracapacitor can be easily calculated by measuring voltage.
- Charge & Discharge comparison to Battery & Ultracapacitor
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- Energy (Joules) Equation for Ultracapacitor
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Different unit between Ultracapacitor (Farad) and battery (Ampere hour) makes users to get confused when adopting Ultracapacitor in their system.
The amount of energy stored in ultracapacitor can be easily calculated by using following equation.
Energy (Joule) = ½ x Capacitance (Farad) x Voltage2 (Volts) It can be converted from Farad for Ultracapacitor to Watt hour unit which is normally used for conventional rechargeable battery.
Energy (Watt hour) = Energy (Joule) / 3600 (sec) LS Mtron recommended to operates ultracapacitor from maximum voltage to half voltage and release ¾ of total energy.
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Capacity of Cell Ultracapacitor Units
[F]Conversion to Battery Units
[Wh]Operation voltage
(2.8V - 1.4V)120 F 98m Wh 350 F 286m Wh 3000 F 2.45 Wh
