Joule Thief replications - not overunity

[ibpointless2]

To prove overunity with a joule thief you need to make a joule thief charger. One battery will charge another but where the overunity will not come out of the joule thief itself. Overunity is anything that is 100 percent efficient so lets say the run battery has a 100 percent charge on it and slowly it charges up a battery and runs a LED. So lets say that the Joule thief is only 80 percent efficient so that means that only 80 percent of the original 100 percent gets put into the charge battery. To the closed mine you would think it is not overunity but you forget that the charge can now replace the run battery and do more work as to charge another battery and run a LED. So a Joule thief charger is 180 percent efficient, thus overunity. You can now do more work then the original 100 percent you thought you had because you recycled the energy which gives you an extra 80 percent run time.

So what we learn is that the Joule thief is not overunity but does lead to getting overunity. 

[NickZ]

 
   Regular AA batteries will work only to a point, as has been mentioned many times before. They will lose their ability to recharge, as they were designed on purpose to be thrown away, and not hold their recharging very well. They are a losing battle. In anycase they can be used to prove the point,  but not very well.  Much better to use New rechargeables, so you don't waist time and effort.
   I have made good use of some old discarded 3.6v cordless phone batteries that are now recharging well, using the Jt.  Usually it is only one of the three old batteries that is bad, and not all of them. But the best thing is to buy new rechargeables, as AAs are not that expensive.  There is not much point in getting the last bit of juice out from old used up AA batteries.

[TinselKoala]

No-load voltage, especially as measured by a modern DMM, is not a good indication of battery charge or the energy content of a battery.

The no-load voltage can be influenced by all kinds of things, most especially in this context by "spike charging" using brief pulses of considerable voltage instead of a steady DC trickle at a volt or two above the battery's nominal voltage.

"Fluffy charge" or surface charge it's called, and lead-acid batteries are especially prone to it.

The only reliable way to measure a battery's state of charge, or energy content, is to discharge it fairly completely through a precisely known resistance, and graph the voltage/time curve. Just looking at the no-load voltage isn't enough.

Any mechanic can tell you about failed car batteries that read 13.5 volts on the voltmeter, but can't start the car, because there just isn't enough real energy behind that voltage.

[resonanceman]

No-load voltage, especially as measured by a modern DMM, is not a good indication of battery charge or the energy content of a battery.

The no-load voltage can be influenced by all kinds of things, most especially in this context by "spike charging" using brief pulses of considerable voltage instead of a steady DC trickle at a volt or two above the battery's nominal voltage.

"Fluffy charge" or surface charge it's called, and lead-acid batteries are especially prone to it.

The only reliable way to measure a battery's state of charge, or energy content, is to discharge it fairly completely through a precisely known resistance, and graph the voltage/time curve. Just looking at the no-load voltage isn't enough.

Any mechanic can tell you about failed car batteries that read 13.5 volts on the voltmeter, but can't start the car, because there just isn't enough real energy behind that voltage.

TinselKoala

I agree with  all that you have said here........but  there  are things that are important that you did not say.

Yes what  you call a fluffy charge does exist

That does not mean that the prosess is  less effective.

It  does not mean that  the  impulses  will not  charge  the battery as well as a conventional  charger.

I  have a 14 Ah  SLA battery that I often use for  powering a JT......... I have not charged it with a normal  charger for  around 2 years now..... I just  have a JT charging it

As far  as a lead acid battery showing full  voltage  but does not  have enough power  to turn over the engine....... yes this does happen....... it is called sulfation ........JTs  can often  remove this  sulfation.......this is a well know  fact.


gary

[Pirate88179]

I think that experiments with caps instead of batteries will narrow the variables associated with batteries.  Especially with those new 3,000 farad supercaps at the new low price.

Bill