Price of Prague supercapacitors

How much does a supercapacitor cost?

The capex costs of supercapacitors are contrasted with the costs of lithium ion batteries and the costs of flywheels in the chart below. A typical supercapacitor stores about 15 seconds of energy, for a capex cost of $10,000/kWh, but just $40/kW of power.

How much energy does a supercapacitor store?

A typical supercapacitor stores about 15 seconds of energy, for a capex cost of $10,000/kWh, but just $40/kW of power. This is down to very high power density (10-25 kW/kg, 10-25x higher than a lithium ion battery), albeit quite low energy density (2-10 Wh/kg, which is 95-99% below a lithium ion battery).

Does a supercapacitor earn a 10% IRR?

This is down to very high power density (10-25 kW/kg, 10-25x higher than a lithium ion battery), albeit quite low energy density (2-10 Wh/kg, which is 95-99% below a lithium ion battery). Hence a supercapacitor system earns a 10% IRR if it charges a 6c/kWh spread and charges/discharges around 30,000 times per year.

Can a supercapacitor be stress-tested?

Numbers can be stress-tested in this model. Supercapacitors store energy electrostatically, as electrical charge builds up on two plates, made of material such as activated carbon or graphene, which is disposed on either side of a dielectric material. If the voltage falls below some threshold level, then the charge will flow off these plates.