[FRSBRZGT86FAN]

Originally Posted by justatroll

Hybrid or Ultra-capacitors have NOT been around for a bazillion years.
When I was in college (90s) a 1 Farad Capacitor would take up a good chunk of a small classroom. Now you can hold 10F in the palm of your hand.




Ultracaps do not self discharge as much as you would think.


http://www.robotroom.com/Capacitor-S...scharge-4.html




Then the discharge flattens out.

and


https://www.tecategroup.com/ultracap...acitor-FAQ.php


Some equipment manufacturers have been using ultra-cap banks for years as a replacement for batteries. An example is in self-starting lawnmowers. That is not a big deal since when the lawnmower comes out the first time in the spring, you will need to start it the old fashioned way (pulling the cord). After that it should hold enough of a charge to start the mower for many weeks.

First off the indigogo project in question was not using ultracaps I believe most likely due to cost.The capacitor will still drain or loose power faster than the regular Ni-Cd/AGM/Li-ion battery even not connected to any devices in eight hours thats still 1.2 volts in self discharge alone not including what the car draws sitting. Some of those lower quality ultra capacitor even drop more than 3-5 volts overnight and that still scales that way because you'll need SIX of those 2.5V ultra capacitors to be equivalent to a car battery and to counter the power loss. It would also need to be 2600F not 500F which are still $70 each times 6 put you around $420, and you still need to create a m,ounting system and R&D to the public. At that point a Lithium ion battery is cheaper and less of a headache.....

The power density of ultra caps vs batteries sucks ass, it's something like 5kw/kg in a ultra cap vs 30-40kw/kg in a battery. Also a "ultra cap battery" in a car would need a built in circuit board to control voltage as it charges. The lawn mower example is intersting can you show me a manufacturer that still uses them? In a 12 V application?