Supercapacitor technical guide Capacitance Charge method Test condition Capacitor voltage less than .05V Ambient temperature 25°C T1= time to reach 63.2% of the applied voltage. Discharge method 1. Constant current charging 10mA/F to rated voltage. 2. Constant voltage applied for 5 minutes. 3. Constant current discharge at 10mA/F down to 0.1V C= I*(T2-T1) V1-V2 3757 W. Touhy Ave., Lincolnwood, Il 60712 ● (847)675-1760● Fax (847) 675-2850 ● www.illcap.com Where C= capacitance in Farads I = discharge current V= rated voltage V1= 80% or rated voltage V2= 40% of rated voltage T1= starting time of test T2= time to reach V2 ESRAC Measured using 4-probe impedance analyzer under the following conditions Condition: Potentiostat mode AC amplitude: 5mV Frequency: 1 kHz, +/-100 Hz ESRDC Constant current charging to rated voltage Hold part at rated voltage for 5 minutes Constant current discharge to 0.1V Where Rd is the ESRDC in Ohms ∆V is the voltage drop after 10mS I= discharge current Leakage current Charge capacitor to rated voltage at 25°C thru a 1k Ohm resistor Leakage current is measured after specified amount of time for the part being tested. 3757 W. Touhy Ave., Lincolnwood, Il 60712 ● (847)675-1760● Fax (847) 675-2850 ● www.illcap.com Maximum current Current needed for a 1 second discharge from the rated voltage to ½ rated voltage Imax= 1/2Vr or t/C +Rd Cxdv/dt= Cx(0.5Vr/1)=0.5xCxVr Where t= discharge time (1 second) C= capacitance in farads Rd= ESRDC Vr= rated voltage Maximum stored energy Emax= ½ CV2 (Joules or watt –seconds) or Emax=1/2 CV2 (Wh) 3600 Gravimetric Specific energy (Wh/kg) = Emax Weight (kilograms) Specific Power V2/ (4*ESRDC *Weight or volume) Short Circuit Current Isc=Vr/ESRdc 3757 W. Touhy Ave., Lincolnwood, Il 60712 ● (847)675-1760● Fax (847) 675-2850 ● www.illcap.com