### Ultracapacitors for drag racing?

Posted:

**Mon, 06 Jun 2016, 23:59**Hello all,

A bit of background: My company ( www.adgero.eu )works on ultracapacitor-based kinetic energy recovery systems for heavy vehicles. The reason we use capacitors for most systems (sometimes in concert with batteries) is because they can be charged and discharged extremely quickly at very high currents, which is essential to recovering as much energy as possible during regenerative braking. They also have a lifetime which is a couple of orders of magnitude longer than batteries which is reassuring for operators. The downside of capacitors compared to batteries of course is their low energy density, so you're not going to be able to drive miles on end with just ultracaps.

So, a friend of mine asked me an interesting question. He wondered if ultracapacitors would be interesting for drag racers, since gobs of power for a short period of time are the name of the game. Off the top of my head I figured it would make sense, but I'd like to get some more informed opinions, and since I'm going to be going to ComVec in Melbourne in July and will have some of these modules with me for people to poke and prod, I thought I'd ask an Australian forum.

Here are the key bits of information about these modules:

Nominal voltage 160 V

Absolute maximum voltage 171 V

Minimum monitoring voltage 15 V

Rated capacitance, initial 50 F

ESR (10 ms DC), initial 14,8 mΩ

ESR (Ac 0,1 Hz), initial 14,8 mΩ

ESR (DC 5 s current-cut) 18,8 mΩ

Leakage current at 25 °C, maximum

Under 150 V 3 mA

Above 150 V 6 mA

Maximum peak current (for 1s duration) 2299 A

Short circuit current 8,5 kA

Maximum module series voltage 1280 V

Maximum stored energy 178 Wh

Number of cells 60

Individual cell capacitance 3000 F

Individual cell rated voltage 2,7 V

Nominal Power (calculated from ESR 10ms)

Nominal specific power

(matched impedance) kW/kg 7,72

Nominal power density

(matched impedance) kW/L 8,34

Practical Power (calculated from ESR AC 0.1 Hz)

Power

(matched impedance) kW 432,43

Practical specific power

(matched impedance) kW/kg 7,72

Practical power density

(matched impedance) kW/L 8,34

Physical Parameters

Typical mass (± 0,002 kg) kg 56,0

Volume L 51,8

Length - width - height mm 768-430-157

Life

Life at rated voltage and maximum

operating temperature 2000 h

Projected life at rated voltage and 25 °C 10 years

Projected cycle life at 25 °C 1,000,000 cycles

Thanks for any feedback you can give me!

Mack Murray

Adgero SAS

A bit of background: My company ( www.adgero.eu )works on ultracapacitor-based kinetic energy recovery systems for heavy vehicles. The reason we use capacitors for most systems (sometimes in concert with batteries) is because they can be charged and discharged extremely quickly at very high currents, which is essential to recovering as much energy as possible during regenerative braking. They also have a lifetime which is a couple of orders of magnitude longer than batteries which is reassuring for operators. The downside of capacitors compared to batteries of course is their low energy density, so you're not going to be able to drive miles on end with just ultracaps.

So, a friend of mine asked me an interesting question. He wondered if ultracapacitors would be interesting for drag racers, since gobs of power for a short period of time are the name of the game. Off the top of my head I figured it would make sense, but I'd like to get some more informed opinions, and since I'm going to be going to ComVec in Melbourne in July and will have some of these modules with me for people to poke and prod, I thought I'd ask an Australian forum.

Here are the key bits of information about these modules:

Nominal voltage 160 V

Absolute maximum voltage 171 V

Minimum monitoring voltage 15 V

Rated capacitance, initial 50 F

ESR (10 ms DC), initial 14,8 mΩ

ESR (Ac 0,1 Hz), initial 14,8 mΩ

ESR (DC 5 s current-cut) 18,8 mΩ

Leakage current at 25 °C, maximum

Under 150 V 3 mA

Above 150 V 6 mA

Maximum peak current (for 1s duration) 2299 A

Short circuit current 8,5 kA

Maximum module series voltage 1280 V

Maximum stored energy 178 Wh

Number of cells 60

Individual cell capacitance 3000 F

Individual cell rated voltage 2,7 V

Nominal Power (calculated from ESR 10ms)

Nominal specific power

(matched impedance) kW/kg 7,72

Nominal power density

(matched impedance) kW/L 8,34

Practical Power (calculated from ESR AC 0.1 Hz)

Power

(matched impedance) kW 432,43

Practical specific power

(matched impedance) kW/kg 7,72

Practical power density

(matched impedance) kW/L 8,34

Physical Parameters

Typical mass (± 0,002 kg) kg 56,0

Volume L 51,8

Length - width - height mm 768-430-157

Life

Life at rated voltage and maximum

operating temperature 2000 h

Projected life at rated voltage and 25 °C 10 years

Projected cycle life at 25 °C 1,000,000 cycles

Thanks for any feedback you can give me!

Mack Murray

Adgero SAS