The voltage provided in the specification is the maximum operating voltage for a single capacitor cell or module. The rated voltage is the voltage in which the performance data is measured. It is possible for the capacitors to experience voltages in excess of the rated voltage. The impact is dependent on the time and temperature during this exposure. At no time should the capacitor be subjected to voltages in excess of 10% of the rated voltage.
The sum of all the internal resistances of a capacitor measured in ohms. Expressed mathematically as ESR = D.F.*Xc. This measurement is taken after 5 seconds. Since the time constant of the ultracapacitors is approximately 1 second, it takes approximately 5 times constants or 5 seconds to effectively remove 99.7% of the stored energy.
A measure of the high-frequency resistance component and is mainly attributed to contact resistance. Because of the time constant of the ultracapacitors, operation at this frequency is highly inefficient. This measurement is provided because it is simple to measure and correlates easily with the DC resistance.
Expected performance change after cycling 500K times from rated voltage to half rated voltage. Cycling performed at a duty cycle resulting in no heating of the supercapacitor with the supercapacitor maintained at 25°C.
Measure of the stray direct current flowing through the capacitor after DC voltage is impressed on it. Stable parasitic current expected when the capacitor is held indefinitely on charge at the rated voltage. This value is voltage and temperature-dependent. Datasheet measurement is at rated voltage and 25°C.
Capacitors connected in series for a higher total voltage rating, although this configuration will have a lower total capacitance than any single one in the circuit. This series circuit offers. The voltage drop across each capacitor is the sum of the total applied voltage.