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Max current
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Zipstor Offline
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Post: #1
Max current
Hi there,

I'm looking for the maximum theoretical amount of current I can pull with a dry cell. Dustin, the Smack just told me 500mA per square inch... My cell is has 6x6 plates, 9 plates that's 324 square inches therefore 162A max

Isn't that a bit much don't you reckon?

>> http://brownsgas.com
08-03-2010 05:10 PM
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jbalat Offline
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Post: #2
RE: Max current
Les mentioned 2-4 sq inches of plate surface per amp of draw so yeh 250mA - 500mA per sq in

Note that this does not mean the cell will not produce steam.. You need to ensure temperature stays under 88 deg C

Your limiting factor then becomes your gas temperature which may mean that you need to operate under 30 Amps !!!

He mentions using an infra red thermometer to easily measure the temp..

There may be ways to reduce the output gas temperature, I have seen a cell with plates hanging beyond the rubber gasket which act like fins to provide cooling...
(This post was last modified: 08-03-2010 08:39 PM by jbalat.)
08-03-2010 08:38 PM
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Zipstor Offline
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Post: #3
RE: Max current
So we are staying at 500mA per square inch.. okay will test that and see how it behaves.

I just been onto Sid's page and found something questionable.

Model Liters /min
12 VDC
40 amp Price
11 2 $269.95
21 3 $399.95
31 4 $529.95
41 5 $659.95

http://fireinthewater.com/Cells.html

He wrote on this table that you can draw 40A on a 11 plate stack. (!!??)
And with the same 40A you can pull more gas on a bigger stack... Does he lives on a different planet? I mean, on my planet, the laws of physics would make a big stack to produce the same amount of gas than the small one, the difference would be that the big one would sustain the current on a long run without heating too much. What do you think?

>> http://brownsgas.com
(This post was last modified: 08-05-2010 05:50 PM by Zipstor.)
08-05-2010 05:48 PM
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staugur Offline
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Post: #4
RE: Max current
(08-03-2010 05:10 PM)Zipstor Wrote:  Hi there,

I'm looking for the maximum theoretical amount of current I can pull with a dry cell. Dustin, the Smack just told me 500mA per square inch... My cell is has 6x6 plates, 9 plates that's 324 square inches therefore 162A max

Isn't that a bit much don't you reckon?
Just a tad unless you're trying to make a cuppa.
6X6=36 X 500ma= 18 amps draw. Don't count all the plates.
How have you configured 9 plates? It could only be built with 7 neutrals and you won't get enough voltage to produce anything. Or Pos///neg///Pos which makes no sense.
08-06-2010 01:19 PM
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Zipstor Offline
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Post: #5
RE: Max current
One cell stack is actually 6 plates +nnnn- (not 9, my mistake) so you're saying that my max amp is only 18?

>> http://brownsgas.com
08-06-2010 11:12 PM
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staugur Offline
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Post: #6
RE: Max current
(08-06-2010 11:12 PM)Zipstor Wrote:  One cell stack is actually 6 plates +nnnn- (not 9, my mistake) so you're saying that my max amp is only 18?

You can probably get it higher using a stronger electrolyte mix but you will end up building a kettle.It's probably going to run hot anyway as you have 5 cells @ 13.8 volts =2.76 volts per cell which is a lot of waste heat.
08-07-2010 06:22 AM
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Zipstor Offline
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Post: #7
RE: Max current
The idea of doing a "peak current" rating on my cell is to be able to crank it up for a short amount of time with a pwm for example. I know that it will not sustain peak current for too long without boiling, that's the idea. For example people using it as a bench top to feed a mini torch. Or in a car situation when you need more guts for 3 minutes.

I will have to figure it out myself as usual! Thanks for the heads up anyway. Lost my house and my job again, back to the country and will have plenty of time for testing i suppose... Will update this post with my results asap.

>> http://brownsgas.com
08-07-2010 09:22 PM
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Llew Offline
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Post: #8
RE: Max current
(08-03-2010 05:10 PM)Zipstor Wrote:  Hi there,

I'm looking for the maximum theoretical amount of current I can pull with a dry cell. Dustin, the Smack just told me 500mA per square inch... My cell is has 6x6 plates, 9 plates that's 324 square inches therefore 162A max

Isn't that a bit much don't you reckon?
Hi Zip,
My large cell has 80 sq inch plates, 5 cell stack. 15 plates in all. Pulls 100amp and puts out 10 LPM HHO. Thats 6.6 amps per plate, each plate 80 sq inch = .0825 Volts per sq inch.
I am still waiting to get my modified DC welder, to properly test it.
My next prototype will be built in a new battery box, with 6 indivigual compartments.
08-16-2010 05:19 AM
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Mr. Binford 2000 Offline
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Post: #9
RE: Max current
Zipstor, The max amps Smack gave you is safe running current, this is in one of the files here http://www.free-energy-info.co.uk/ , and that level is not suppose to degrade the s.s. plates. Higher current above 1 amp/sq. inch is reported to. Surface area is calculated by one side of plate, thus 6x6=36x.5= 18, for a series cell.
(This post was last modified: 08-16-2010 01:26 PM by Mr. Binford 2000.)
08-16-2010 12:54 PM
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jbalat Offline
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Post: #10
RE: Max current
Ok so if you were running 3 cells

6 x 6 = 36 x 0.5 = 18 x 3 = 54 Amps

The only issue with this formula is that the number of plates in each cell is not considered ??

We know that 7 will produce the least amount of heat...
08-16-2010 03:38 PM
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