A Perspective On The B Type EESD - Robert Murray-Smith - Any issues?

[MileHigh]

Build something better MH. Oh that's right you don't build, you tear down. I can't comment on your calculations, what I would say is that I'd trust a man who gives freely and generously of his time rather than one who seemingly spend all his time criticising others work and does none himself.

Bullshit.  If you can't understand the concept of ampere-hours and how they implicitly are tied into an associated voltage then you may as well pack it all in right now.  If you can't understand how to measure how much energy a battery can output into a load you may as well pack it all in right now.

But I don't believe that you don't understand that, because if you don't understand that then you don't understand volts x current x time = energy.  If you don't understand that then you can't perform a single experiment.  You are FOS and playing dumb because you feel some strange compulsion to not dare say the guy is dead wrong because you are scared of speaking the truth.  So you would rather act the fool because you think that's safer.  If you had any damn courage and strength of character you would also say the guy is dead wrong because you damn well know he is dead wrong.  So right now you are just his lackey and playing the fool.  It's a super fail.

[Jimboot]

Bullshit.  If you can't understand the concept of ampere-hours and how they implicitly are tied into an associated voltage then you may as well pack it all in right now.  If you can't understand how to measure how much energy a battery can output into a load you may as well pack it all in right now.

But I don't believe that you don't understand that, because if you don't understand that then you don't understand volts x current x time = energy.  If you don't understand that then you can't perform a single experiment.  You are FOS and playing dumb because you feel some strange compulsion to not dare say the guy is dead wrong because you are scared of speaking the truth.  So you would rather act the fool because you think that's safer.  If you had any damn courage and strength of character you would also say the guy is dead wrong because you damn well know he is dead wrong.  So right now you are just his lackey and playing the fool.  It's a super fail.

. you on the other hand have super powers and can read ppl minds, you probably don't understand but posts like that are often why you are referred to as a troll

[tinman]

Build something better MH. Oh that's right you don't build, you tear down. I can't comment on your calculations, what I would say is that I'd trust a man who gives freely and generously of his time rather than one who seemingly spend all his time criticising others work and does none himself.

Jim
MH is correct.
I too like RMS and all he has done,but when it come's down to it,he(RMS) is just wrong on this one. His calculations are way out to lunch.

The thing is,he has totally forgot about the voltage-->there is no power with current alone.
So some quick and dirty calculations from his clip.
I see the average current over that 4 minutes of his EESD as being about 74mA,and an average voltage of around .94 volt's<--and this is taking into account that very quick 1.5 voltas at the start that dropped to 1.4 in about a second. So over that 4 minutes we had around 69.5mW of power flowing. Now,if we average that over an hour,we would have 69.5mW/15 =4.63 mWh <--can i do it this way MH,PW ?

Now if we look at the Li Ion battery. RMS states that it is an 1.1 amp hour battery=or something close to that. The voltage of those batteries is around 3.6v. Now,because we dont have a discharge time or current for that battery,we cant be to accurate with the amp hour discharge rate. But we can safely assume that it will be higher than the 74mA average that RMS discharged his cap at. So now we can calculate the power output over time for that Li Ion battery.
This will be 3.6 volts @ 74mA=266.4mW. Going by battery specs at the 1.1 amp hour rating,and the fact that we are only drawing 74mA,we could expect to draw that much power for around 14.8 hours.

So we have RMS EESD providing 4.63mWh for 1 hour,and the LI Ion providing 266.4 mW for say 14 hours. So for 1 hour,RMS EESD only provides 1.73% of that of the Li Ion battery-->over the 14 hours that is only .12% of the energy the LI Ion battery could supply.
Things dont look so good now.

Edit: In saying all this,i have to admit that the capacity per weight volume is still very good.
Please see my next post

[tinman]

OK,so here is some scientific info for you MH

Watching the video ,and taking note of time,volts and current shown on RMS's video,and after many tests using different size capacitors,i can achieve the same discharge curve as RMS shows with his EESD by using a 25 farad cap discharging over a 10 ohm resistor. The voltage and current drop over the given time are within a micky wisker of each other. So it would seem that RMS's EESD capacity is very close to 25 farads. The thing i dont know is to what voltage RMS's EESD can be charged to,where as the 25 farad cap can be charged to 2.7 volt's. At 1.5 volts,the 25 farad cap will store 28.125 joules of energy,but at 2.7 volts,it will store 91.125 joules of energy.

The other differences are
1-my 25 farad cap weighs some 16 times that of the EESD in total,
2-the super cap would be a lot more expensive to buy,than it would be to make the EESD.
3-If the EESD were lifted to the weight volume of that of the super cap-->in other words,we would have 16 of his EESD's charged to 1.5 volts,then the capacity would exceed that of the super cap by a factor 5x-or very close to,when the super cap was charged to the full 2.7 volts.

So regardless of the mistakes you and i picked up on,it would still seems that the EESD exceeds todays super caps per weight volume by a factor of 5.
So now what?.

Things we still need to know
1-Cycle life of the EESD
2-safety issue's-like,will they catch fire if the load is too heavy
3-how fast can they be charged before heat destroys them.


Brad

[MileHigh]

. you on the other hand have super powers and can read ppl minds, you probably don't understand but posts like that are often why you are referred to as a troll

You don't have the guts or character to admit that you are wrong when it is as plain as day.  And you damn well know that I know what I am talking about and if I make a mistake I will freely admit it.  Then you play a silly straw man game.  You are clearly the one that is trolling me.