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Post by You Must Enter A Name on Jul 31, 2014 22:31:53 GMT 10
www.instructables.com/id/The-Forever-Rechargeable-VARIABLE-Super-Capacitor-/I remember about 15 years ago I was searching for something along these lines on the internet but every source of the PDF file was deleted or taken down (conspiracy?) anyway here it is (As above) a pretty cool device to have on hand for any situation, when timer permits I would love to build one to charge on solar and output on USB or 12v cigar lighter socket.
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Post by graynomad on Aug 5, 2014 22:02:18 GMT 10
Could be neat, at least with super caps you can charge as fast as you like.
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Post by thereth on Aug 5, 2014 23:42:23 GMT 10
please excuse my ignorance but why would you use capacitors instead of a battery?
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Post by You Must Enter A Name on Aug 6, 2014 8:01:09 GMT 10
Batteries have a shorter shelf life. I.E they don't hold a charge as long as a capacitor will and they can only be recharged so many times before they begin to degrade. Capacitors are not infinite either, but they will go the distance for our lifetime.
It's just an interesting thing, the technology isn't quite right yet for a direct replacement but it would make a very handy tool to have in a bad situation.
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Post by graynomad on Aug 6, 2014 10:29:18 GMT 10
Also you can charge a cap essentially as fast as you like, batteries take ages. I'm not really up on the other differences, for example I don't know about the relative internal resistance, self discharge etc. I can only assume there are reasons for not using caps though, or we would all be doing so.
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Post by pheniox17 on Aug 6, 2014 11:28:13 GMT 10
Its very hard to control a discharge form a cap, also over charge a battery dose damage but the bat can still be use able, over charge a cap... BOOM
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Post by You Must Enter A Name on Aug 6, 2014 12:43:11 GMT 10
Its very hard to control a discharge form a cap, also over charge a battery dose damage but the bat can still be use able, over charge a cap... BOOM 100% correct, that all comes down to the design of the charging and regulating circuit. |
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