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Your 7 cell unit is acting just like mine, as it is. Think we are going to have to go down to 6 cells. I sure hate taking the generator apart, but looks like that might be the only answer. We will eventually get it running.
Statistics: Posted by bcash4039 — Tue May 20, 2008 11:29 am
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Volts 14.92 / Amps 14.4 / 1.27 LPM = 83% efficiency
After about an hour warm up
Volts 14.3 / Amps 22.4 / 2.06 LPM = 90.66 % efficiency
I believe that is not too bad for a auto filling cell.
Now going to the alternator from a cold start.
Volts 14.3 / Amps 5.4 / .46 LPM = 83.17% efficiency
The problems is that after running for about 6 hours it still doesn’t get to about 12 -14 amps. My theory is that I am not getting enough volts out of the alternator to push the amps though to get it to warm up and work properly. With 7 cells on the battery charger at 14.9 volts there is 2.13 volts across each cell. On the alternator at 14.3 volts there is 2.04 volts across the cell. Now given that I have current leakage due to the 1/8 inch hole in the side wall of each cell. I believe the I am on the border line of having enough volts to break the water apart but not enough to warm the solution to a good operating temperature.
So, I have to up the voltage across each cell just a little more. How to do that.
I know they make 15 and 16 volt alternators but what would that do to a 12 volt battery.
The other thing I was thinking about was going to a 6 cell generator. That would give me 2.38 volts across each cell, which would most likely be too much, but I could put a PWM in line to bring it back down to where its needs to be. As always I appreciate everyone’s thoughts and suggestions.
Statistics: Posted by bcash4039 — Sun May 18, 2008 8:02 pm
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Now its somewhat harder to do, but by no means impossible and still practical.
However Be Aware that some alternators only use 50 Volt Diodes, while others use 200 volt ones.
And 110 volts out on a 50 volt diode is Not good.
Statistics: Posted by chemelec — Sun May 18, 2008 5:33 pm
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Put this in after rinsing the cells with distilled water.
If you have conditioned your cells with the previous batch - it may well require a change.
Dont throw away the old solution, store it in safe Plastic bottle for
conditioning the next unit.
Glenn.
Statistics: Posted by glenn_aircooled — Thu May 01, 2008 6:27 am
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You havent got much room to increase as you dont want to go above
27 % but you may as well increase it to see if you can lift the output a little.
You will hopefully find that with a good Alternator , you can squeeze just
a little more Volts through. I would expect 13.8 V. Both this slight increase in voltage and the
slight increase in concentration will up your out put. It is interesting to see
how a small voltage change at the " Knee " point of the graph can make a significant
difference to the output. The " knee " point I call it , is at around 13.4 V
. Around this voltage - the graph of Current Vs Voltage does not act linearly.
This is because the voltage per cell is at the point of moving toward an
Inefficient reaction...... but more output .
Keep us informed.
Glenn.
Statistics: Posted by glenn_aircooled — Thu May 01, 2008 6:22 am
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Thanks I think that am going to replace this alternator with one of about a 100 amps, but i think i am going to have this one rebuilt for bench testing. Yes with this car it is going to very hard to get it off.
Statistics: Posted by bcash4039 — Wed Apr 30, 2008 8:20 pm
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