# How to appropriately calculate the capacitance of ultracapacitor

（1）      constant current：

C=It/( Vwork -Vmin)

eg：Vwork＝5V,  Vmin＝4.2V,  t=10s,  I＝100mA=0.1A

the capacitance：C =0.1*10/(5 -4.2)=1.25F

For SPS, MCV0001C5-0005R5LTN/ MCV0001C5-0005R5LTZ/ MCF0001C5- 0005R5LTZ

is the choice.

（2）      constant power:

C*ΔU2/2=PT

eg：P=200KW,  t=10s, Vwork＝750V, Vmin＝450V

the capacitance：

C=2*200kw*10/(7502-4502)=11F

So the ultracapacitor whose voltage is above 750v and capacitance is 11F can meet this demand.

If the calculated value is beyond the capacitance of standard modules or cells, Customized  products can be the best chioce.

Multiple capacitors in parallel connection:  C=C1+C2+C3+…+Cn

Multiple capacitors in serial connection：  1/C=1/C1+1/C2+…+1/Cn

Multiple capacitors in parallel/serial connection: C=(C1*C2*C3)/(C1+C2+C3)

Supreme Power Solutions Co., Ltd. (SPS) is a leading manufacturer of ultracapacitors, as well as a provider of ultracapacitor energy storage systems and technological solutions. Our products have wide industry applications, such as new energy vehicles, wind turbines pitching control systems, trams and subways, smart grid, micro grid, heavy duty machineries, intelligent instrument, etc. We support more than 200 customers, and our products are exported to 26 countries and territories.

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