Latest toys... - Page 1
Forum section: electronics / projects

author: CM800
author_rank: Frequent Contributor
timestamp: February 28, 2014, 05:54:13 pm
content: Managed to buy 4 of these maxwell boost caps 2.7v @ 3000FHad a little play around, melted some copper wire.. but what to do with them now? any ideas? (or did i just waste £80)

author: David Hess
author_rank: Super Contributor
timestamp: February 28, 2014, 06:31:14 pm
content: Find 4 or 6 more and build a replacement for the starter battery in your car.

author: delmadord
author_rank: Regular Contributor
timestamp: February 28, 2014, 06:36:45 pm
content: Quote from: David Hess on February 28, 2014, 06:31:14 pmCould you please explain what would be the benefits of suparcapacitor based car battery? Less self-discharge, greater longevity or better performance over temperature range? I am curious

author: robrenz
author_rank: Super Contributor
timestamp: February 28, 2014, 06:49:50 pm
content: Make yourself a battery tab welder

author: CM800
author_rank: Frequent Contributor
timestamp: February 28, 2014, 06:51:22 pm
content: Quote from: robrenz on February 28, 2014, 06:49:50 pmCould be a good idea, ive ordered some M12 lugs to put on it as i have some 50mm2 wire with no method to attach it.

author: David Hess
author_rank: Super Contributor
timestamp: February 28, 2014, 07:16:10 pm
content: Quote from: delmadord on February 28, 2014, 06:36:45 pmAssuming the proper design with cell balancing, it will both perform better over temperature and last longer. It would only be more economical if you could get the supercapacitors for cheap though and you lose the large reserve capacity that a starter battery provides.

author: cybermaus
author_rank: Frequent Contributor
timestamp: February 28, 2014, 07:20:11 pm
content: Are those M12's?? What is the size of those things?Just for fun, can you measure their resistance, or would that fall below the the 0.00 of a typical ESR meter?

author: CM800
author_rank: Frequent Contributor
timestamp: February 28, 2014, 07:32:44 pm
content: Quote from: cybermaus on February 28, 2014, 07:20:11 pmAfraid i do not have a ESR meter.. yet.

author: Artlav
author_rank: Frequent Contributor
timestamp: February 28, 2014, 10:17:29 pm
content: Nice. Got 12 of these too.Haven't really found a good use for them either.They are not that big, and surprisingly light:Compared to BCAP0350 (D cell), a generic 100F cap and a 9V battery:One thing they are good at is that they can give practically unlimited current for some while, without any danger.Unlike batteries which will explode if short circuited, or capacitors which give high current for very short time.I did all sorts of pulse power experiments with them, and occasionally use them when i need a portable super-low impedance power source.I.e. induction heating:Or lighting xenon arc lights:And so on.ESR meter does not read anything meaningful on them.I also had a few dozen BCAP0350, D cell sized ones, which i put into a single 55V battery - now that is useful as a power source for linear magnetic accelerators.

author: CM800
author_rank: Frequent Contributor
timestamp: February 28, 2014, 10:34:08 pm
content: Very nice, wouldnt mind getting some more to be honest.. but im kind of poor now.. spent way too much money. Need to sell more of my peltier units.Where did you get those bolts for between the caps?EDIT:Nevermind, managed to find some bolts

author: Frost
author_rank: Regular Contributor
timestamp: February 28, 2014, 11:06:34 pm
content: Quote from: TCWilliamson on February 28, 2014, 10:34:08 pmAt the hardware store?The bolts seem to be normal M12 DIN 6334 extension/coupling nuts.

author: Tinkerer
author_rank: Frequent Contributor
timestamp: March 01, 2014, 04:36:51 pm
content: So question, what do you need a portable induction heater for?'As for the car battery replacement, that is indeed possible. It is not recommended if your car will be sitting for a several days at a time without use though as the voltage will drop alot because they naturally drain alot more quickly than batteries. Unless you dont mind giving them a jolt to charge them back up before you need to go somewhere after a longer period.There is at least one guy on youtube that put up videos about replacing his car battery with supercaps.

author: David Hess
author_rank: Super Contributor
timestamp: March 01, 2014, 05:12:57 pm
content: Quote from: Tinkerer on March 01, 2014, 04:36:51 pmI have considered making one for annealing cartridge case necks. I suspect it would be more consistent than using a torch.QuoteOne or two weeks appears to be feasible. A small charging circuit and auxiliary battery would solve this problem. If I did this as more than a test, I would add charge balancing anyway.