Test/Review of Cooper 300F supercap

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HKJ
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Test/Review of Cooper 300F supercap
Cooper 300F supercap

DSC_6365
Official specifications:
  • Rated capacity: 300F
  • Rated voltage: 2.70V
  • Absolute maximum voltage: 2.85V
  • Operating temperature range: -40°C to 65°C
  • Life: 10 years at 25°C and rated voltage.

Cooper%20300F%20supercap-info

Supercaps are a alternative to batteries at least in some cases, but their abilities are very different. I have performed the test as a battery test, making it easy to compare to batteries.
Something to note:
Supercaps has a fairly low voltage rating, for higher voltage they must be used in series and this will require a balancing circuit.
This type of supercap can handle extremely high current both charging and discharging.
The discharge and charge curve is linear and the capacitor can be discharge to zero without damage.
The capacitor has a fairly high self discharge.

DSC_4476 DSC_4479

DSC_4477
DSC_4478

DSC_4475

This supercap is roughly the size of a D cell, but the capacity and energy contents is much lower (about 1/10 of an AA cell).

Note: I cannot maintain the 20A discharge below 1.4 volt, at 1 volt it is about 15A.

Cooper%20300F%20supercap-Capacity

The discharge is very linear and can go all the way to zero volts.

Cooper%20300F%20supercap-CapacityTimeHours

Cooper%20300F%20supercap-CapacityTime

Cooper%20300F%20supercap-Energy

Cooper%20300F%20supercap-PowerLoadTime

1 watt for about 15 minutes can the capacitor deliver.

Cooper%20300F%20supercap-TripCurrent

First test run discharged the supercap.

Cooper%20300F%20supercap-Charge

I only charge with 1A current, it is possible to charge considerable faster.



Conclusion

Compared to batteries the capacity is very low and cannot really replace a battery. It is more useful for high current pulses or equipment that only needs a low amount of energy and stays on a charger most of the time.



Notes and links

How is the test done and how to read the charts
Battery test main index
A 3000F supercap

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

HKJ
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Last supercap review, this capacitor is 1/10 of the other one: http://budgetlightforum.com/node/33167

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Bort
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Thanks for the review!
What brought you to supercap testing?

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Bort wrote:
Thanks for the review! What brought you to supercap testing?

People that say then can be used instead of batteries. I did know that capacitors was considerable less, but I wanted directly comparable result.

 

Here is one of the silly examples: https://www.kickstarter.com/projects/shawnpwest/30-second-charging-recha...

He is using a better capacitor that the ones I have tested, but it is very far from being good enough (Probably 40F @ 3.8V).

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HKJ wrote:

Bort wrote:
Thanks for the review! What brought you to supercap testing?

People that say then can be used instead of batteries. I did know that capacitors was considerable less, but I wanted directly comparable result.

 

Here is one of the silly examples: https://www.kickstarter.com/projects/shawnpwest/30-second-charging-recha...

He is using a better capacitor that the ones I have tested, but it is very far from being good enough (Probably 40F @ 3.8V).


thats nuts, though i want to understand how only a few Wh can start a car

http://laserhacker.com/?p=110
https://www.youtube.com/watch?v=z3x_kYq3mHM

The Journal of Alternative Facts TM

"It is critical that there is a credible academic source for the growing and important discipline of alternative facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists"

 

 

 

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Bort wrote:
thats nuts, though i want to understand how only a few Wh can start a car http://laserhacker.com/?p=110 https://www.youtube.com/watch?v=z3x_kYq3mHM[/quote]

What you need to start a car is lots of amps for a short time.

300A for 3 seconds at 12 volt is only 3Wh

Wh is measured over on hour and there is 3600 seconds in an hour, i.e. something that uses 300*12 -> 3600 watt, will only use 1 Wh each second.

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Bort wrote:

thats nuts, though i want to understand how only a few Wh can start a car

http://laserhacker.com/?p=110
https://www.youtube.com/watch?v=z3x_kYq3mHM


It’s not the Wh that matters to start a car, it’s the Watts (i.e. current) the battery can deliver.

My English isn’t perfect but I’m trying to improve it. If you see something that doesn’t sound right or is just plain wrong, please feel free to point it out! Smile

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@HKJ: About that kickstarter project using supercaps:
I quite often hear people saying that one day we will have smartphones or electric cars that can be charged in 1-2 minutes.
Although the battery/capacitor technology may become available one day, what people don’t realize is that you would need an AC to DC transformer 10 times bigger than the smartphone or the car to achieve that.

My English isn’t perfect but I’m trying to improve it. If you see something that doesn’t sound right or is just plain wrong, please feel free to point it out! Smile

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HKJ wrote:

Bort wrote:
thats nuts, though i want to understand how only a few Wh can start a car http://laserhacker.com/?p=110 https://www.youtube.com/watch?v=z3x_kYq3mHM

What you need to start a car is lots of amps for a short time.

300A for 3 seconds at 12 volt is only 3Wh

Wh is measured over on hour and there is 3600 seconds in an hour, i.e. something that uses 300*12 -> 3600 watt, will only use 1 Wh each second.


thanks, that makes a lot of sense now
the unbalanced circuit that is used with 6 supercaps in series, would that reduce their life drastically?

The Journal of Alternative Facts TM

"It is critical that there is a credible academic source for the growing and important discipline of alternative facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists"

 

 

 

HKJ
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lagman wrote:
@HKJ: About that kickstarter project using supercaps: I quite often hear people saying that one day we will have smartphones or electric cars that can be charged in 1-2 minutes. Although the battery/capacitor technology may become available one day, what people don't realize is that you would need an AC to DC transformer 10 times bigger than the smartphone or the car to achieve that.

Not necessary, you just have to equip the charger with a couple of supercaps too and keep it connected to mains.

But the charge connector, that might need to be rather solid. No small usb connector, but probably a docking station.

 

Bort wrote:
thanks, that makes a lot of sense now the unbalanced circuit that is used with 6 supercaps in series, would that reduce their life drastically?

Did that circuit not use some leds to balance the caps?

To high voltage on a capacitor can destroy it.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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HKJ wrote:

lagman wrote:
@HKJ: About that kickstarter project using supercaps: I quite often hear people saying that one day we will have smartphones or electric cars that can be charged in 1-2 minutes. Although the battery/capacitor technology may become available one day, what people don’t realize is that you would need an AC to DC transformer 10 times bigger than the smartphone or the car to achieve that.

Not necessary, you just have to equip the charger with a couple of supercaps too and keep it connected to mains.

But the charge connector, that might need to be rather solid. No small usb connector, but probably a docking station.

 

Bort wrote:
thanks, that makes a lot of sense now the unbalanced circuit that is used with 6 supercaps in series, would that reduce their life drastically?

Did that circuit not use some leds to balance the caps?

To high voltage on a capacitor can destroy it.


no circuitry at all, just the caps in series, and the battery to recharge them with (though i suspect the car alternator charging the lipo battery won’t work well long term)
The car would charge with 14-14.4V to 6 supercaps in series (i would not use the lipo battery as the guy didn’t in the video i linked)

The Journal of Alternative Facts TM

"It is critical that there is a credible academic source for the growing and important discipline of alternative facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists"

 

 

 

HKJ
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Bort wrote:
no circuitry at all, just the caps in series, and the battery to recharge them with (though i suspect the car alternator charging the lipo battery won't work well long term) The car would charge with 14-14.4V to 6 supercaps in series (i would not use the lipo battery as the guy didn't in the video i linked)

As I wrote above, over voltage might* damage them, people that are used to working with capacitors always add a balancing circuit to avoid any problems.

*If the voltage is high enough it WILL damage them.

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HKJ wrote:

Bort wrote:
no circuitry at all, just the caps in series, and the battery to recharge them with (though i suspect the car alternator charging the lipo battery won’t work well long term) The car would charge with 14-14.4V to 6 supercaps in series (i would not use the lipo battery as the guy didn’t in the video i linked)

As I wrote above, over voltage might* damage them, people that are used to working with capacitors always add a balancing circuit to avoid any problems.

*If the voltage is high enough it WILL damage them.


is there circuitry that would work in an automotive environment on 6 caps in series? (i guess each would see about 2.5V so below their max voltage?)

The Journal of Alternative Facts TM

"It is critical that there is a credible academic source for the growing and important discipline of alternative facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists"

 

 

 

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Bort wrote:
is there circuitry that would work in an automotive environment on 6 caps in series? (i guess each would see about 2.5V so below their max voltage?)

Of course. It's just diodes, but you can buy it as a kit and spend more money if you'd like.

http://www.ebay.com/itm/301130956938 - balancer kit only

The complete bcap module kit includes the balancer stuff as well: http://www.ebay.com/itm/301128832966

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Bort wrote:
is there circuitry that would work in an automotive environment on 6 caps in series? (i guess each would see about 2.5V so below their max voltage?)

I saw a circuit with a led and a diode in series for each capacitor. It is not the best circuit, but it is simple and will probably work as long as the capacitors has about same value (They change value with age).

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cool, thanks

The Journal of Alternative Facts TM

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But this balancing circuits only discharge overcharged caps and don’t prevent overcharging them or am I wrong.
If somebody would charge a couple of caps with some Amperes the leaking of 30mA seems to be no ideal thing.
Or does short time overcharging don’t harm these caps?

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Werner wrote:
But this balancing circuits only discharge overcharged caps and don’t prevent overcharging them or am I wrong.
If somebody would charge a couple of caps with some Amperes the leaking of 30mA seems to be no ideal thing.
Or does short time overcharging don’t harm these caps?

that is a good point, i would want it to maintain charge for a few days or up to a week.

The Journal of Alternative Facts TM

"It is critical that there is a credible academic source for the growing and important discipline of alternative facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists"

 

 

 

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How do you overcharge them? You'd have to connect the 6S module to a voltage source higher than 16.2 volts. So don't do that.

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I just followed the link to the battery starter with a lipo attached and I am wondering why not directly use a lipo pack? These are often rated for high currents…?

Maybe I have t understand how the balancing works… I will check it a bit further..
This video shows what I mean very good
https://m.youtube.com/watch?v=dAyY0D16qn4
So it doesn’t prevent overcharge in all conditions…but it works good enough for being so cheap…

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comfychair wrote:
How do you overcharge them? You'd have to connect the 6S module to a voltage source higher than 16.2 volts. So don't do that.

The over charge is due to difference in capacity and different leakage current and will happen slowly.

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'High current' is relative...