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If i charge a supercapacitor, how do i know or test this supercapacitors that it really store the energy (like a battery) and doesn't discharge ? Can anyone give some reference or method?

Can i use the multimeter to see whether the supercapacitor have voltage or not?if it has voltage ,then it does charge the energy?

Shine Sun
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2 Answers2

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how do i know or test this supercapacitors that it really store the energy (like a battery) and doesn't discharge ?

Put a high impedance voltmeter across the super capacitor and plot the reduction of voltage with time. Energy stored is \$\frac{CV^2}{2}\$ so as the voltage dwindles, so does the energy. If V reduces to 90%, Energy has reduced to 81%.

Andy aka
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  • Can i use the multimeter to see whether the supercapacitor have voltage or not? – Shine Sun Mar 03 '18 at 13:58
  • I mean,separate the supercapacitor from the original circuit,and use the multimeter to measure its voltage?if it has voltage ,then it does charge the energy? – Shine Sun Mar 03 '18 at 14:01
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    @ShineSun Charge the super capacitor then disconnect it from the charging circuit and apply a voltmeter. Record volt meter readings every hour or minute and notice the voltage fall over time. – Andy aka Mar 03 '18 at 14:03
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Due to the double layer electric effect, there is a special procedure given by the Mfg to get the rated capacitance. You may follow that process by that datasheet which may or not conform to the test standards established.

If you dont care about accuracy because at high currents, it is time rate dependent.

It is trivial

C= Ic*dt/dV

Tony Stewart EE75
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