powering multiple 7 cell units

[kevinsatterfield]

[adam666]

[Chris]

Yup exactly correct. So you build em' small... you build em' super efficient, and then you add sets in parallel as needed for the proper gas output.

Complications would come into play with poor seals and tubing. That's why I'm going with the new v5 design that I have to try to make the units really compact, safe and leak proof. Tubing, now that will be another challenge.

Bubbler, that too will be a bit of a challenge. That's where a site like this is great. It let's you share ideas and improve on each others thoughts.

[cnctony]

If you add cells in series you do not just add the current..... That is for parallel.

6 to 7 cells is the perfect number for a 12V circuit thus the voltage drop across each cell in series would be 2V for 6 cells or 1.7 for 7. Voltage needs to be arround 1.6 -2.0V for the cell to be efficient. Current would be determined by the following formulas

Rt = R1+R2+R3......

It = V/Rt

Where Rt is the total resistance of the series circuit. And It is total current.
V is Volts applied to the series circuit.

Thus if you had 7 cells that when connected individually draw 20amps your resistance would be R=V/I or 12/20= 0.6 ohms. When you add 0.6 ohms X 7 cells you get 4.2 ohms thus your current draw would be.

I= V/R 12/4.2 = 3.2 amps TOTAL, in series. With a voltage drop across each cell of 1.6V for 7 cells.

You would need to add more electrolyte to decrease the resistance and increase your current thus more production of hydrogen.

Using 7 in parrallel the formula is
1/RT = 1/R1+1/R2+1/R3..........

If all of the cells are 0.6 ohm seach that makes it easier you just divide 0.6 by 7 thus I=12/0.086 or ~140amps. Adding them would be correct if they all have the exact same resistance.

This is a bad ideal because if one unit shorts out then you draw maximum amps until fuse blows or meltdown. In series if one shorts out the current only goes up a 1/7th. and production continues.

Make sense?

Anthony Bridges

[pertyfly]

If you read his first post above, he was referring to parallel.

He asked about putting multiple 7 cell units together, thus parallel his series units. He is already aware of the series efficiencies.

The post in reply to him by adam is correct as well, where current is increased with series cells running in parallel.

Chris

[cnctony]

[pertyfly]

[kevinsatterfield]

[adam666]

hey kev,

Ive drawn a little picture of how I would arrange a 6 unit setup such as yours.



cheers
Adam

[scopemaster]

If you create a box with seperate partitions for multiple cells, Can the cells share the same electrolite or does it need to be isolated such as a battery?

An example - Partions has a hole or small opening on the bottom to allow a single fill point. Or does it need to be individual filling per cell?

[pertyfly]

That's the problem....

If the cells share a common electrolyte, then the current (or some of it at least) will leak between cells. If we have current leakage, then it's not going to be very efficient (or as efficient as it can be). To get maximum efficiency, you must have each cell totally electrically isolated from one another.

Unfortunately, I'm sure we all wish it was that easy

As of yet, we pretty much have to fill each one separately.

[pertyfly]

Unless of course you make some complex filling apparatus, with level sensors (or floats) in each cell all filled from 1 reservoir which is somehow electrically isolated, not allowing current to flow from 1 cell to another through the hoses?

But this kind of thing need not be done until we got a very nicely working unit. Eexperimentation can be easily done by manually filling

[kevinsatterfield]

I have a filling idea that if it works is gonna be so damn cool you'll want one, lol well maybe not so much the filling part but the site guage is what I'm thinking about..

[Bob Boyce]

I will be posting some mechanical diagrams in my project folder soon that show series cell sealed type units and a series cell filling manifold for those type of units.

Bob

[pertyfly]

Cool! I saw you posted that message to Chris. I'm really interested to see that. Can't wait!

I also can't wait to see your design eliminating the need for machining those spacing inserts