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Old 07-10-2013, 12:11 AM   #8 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 4,101

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 64.21 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Quote:
Originally Posted by Lbar View Post
Did I miss where he said what the capacitors cost in the first vid?
Yes, he did say. The smaller pack was built with 6 capacitors that cost, IIRC, something like $10 each. The first pack, with bigger and cheaper capacitors, I can't recall what eh said they cost (or if he said )

Quote:
Originally Posted by RiceCake View Post
Capacitors have self-discharge.

Couple that with the fact that the caps don't have a lot of amp-hour capacity, and your car will undoubtedly pull a tiny trickle of current to keep your clocks and settings in order...

So unless you plan to charge the car after it sits a few hours (which will undoubtedly result in a totally dead capacitor bank), you'll need a battery.

And then you've defeated everything.

Neat idea though as a boost option. If you could get 6 seconds of cranking out of a bank of them, it would be nice to have in winter.

2000+ cranking amps for the win

Edit: Also without inter-cell balancing, a single cell could (theoretically) be overcharged by the cars alternator, resulting in a nasty explosion (or just the cap venting, YMMV).
When you watch the videos, you'll see how he tests and answers these problems... the "mini-boost pack" lasts a whole weekend in one test, cranking the car after three nights without a new charge from the ALT. For longer duration, he ultimately hybridizes the "mini boost pack" with a small battery.

Really quite cool. But I would think that the benefit in weight-loss causes a problem for FE by loading on the alternator, which will have to charge the capacitors pretty often. This might be a fun way to attempt to copy Mazda's capacitor charging regenerative braking system.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.


Last edited by California98Civic; 07-10-2013 at 12:34 AM.. Reason: needed to correct confusing "gain in weight" phrase in last paragraph
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