Quote:
Originally Posted by mdm
I don't even need to read it. Capacitors have been around for a bazillion years, longer than cars. If they were usable as car batteries, professional engineers would use them already.
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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.
Quote:
Originally Posted by FRSBRZGT86FAN
4) I can tell as a budding electrical engineer why this is hard to create, capacitors self discharge, in fact even if they sourced the best capacitor EVER it would discharge around 5% overnight, that's not including what the car draws when off for electronics and evap tests etc. After several hours of sitting this capacitor will probably be dead. It awesome for something like KERs to get an electric boost but not for battery duty long term
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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.