A short short story.
Once I had an idea.
Then I talked to ppl who generally reacted like:
Which made me feel:
But the idea wouldn't go away..
So I did R&D and got some results:
Then some folks doubted me:
I felt:
Others encouraged:
Others advised:
I felt
I have come too far to stop now,...how will the story end?
My experience is that any benefit that seems to derive from "pulsing" a flooded-cell lead-acid automotive starting battery can be achieved more simply by applying a periodic "equalizing charge" as described **broken link removed**Pulsing is just a way of limiting the heating of the battery while overcharging it. Simply using a DC constant-current supply set to deliver ~3A for a 65AH battery prevents self-heating and drives the chemistry to balance state-of-charge in the cells and dissolves sulphates. By necessity, it consumes some of the electrolyte by producing O and H, so can only be done to flooded batteries with caps.Finding the bad one is not the problem. Fixing it so it plays well with others seems to be the problem.
Have you tried this?
**broken link removed**
I think this is what Mike & others are talking about.
A diode across the battery only dumps the battery's kickback not the kickback from the 3' of cabling.
The one advantage I could see with pulsing is that the voltage across the battery is higher than with just a 15.5 volt equalization charge. This might serve better to break down the coating.
..
It is likely that your 30V current limited supply will obtain results, how fast though? Can it do a 40-50Ah battery in a day?
Looking at the scope trace in post #7.
I count the grid area under the pulse current curve to be 2/3 of a square wave. 16 grid squares rather than 24. Pulsewidth is 40uSec with a 2000uS period = .02DC.
Looking at the voltage differential (yellow) over the pulse the average appears to be 19V. Thus we have .02 * 640 * 2/3 * 19 = 162W delivered.
At the average of about 8.4A supplied (ammeter measured), this time 100% DC => 19 x 8.4 = 159.6W. I'd call that a dead heatgiven the eyeball errors reading from that chart.
Thus with the pulsed heat pattern the net heating of the battery ought to be less due to extra heat loss to ambient as a result of the DELTA Temp spikes conducting more rapidly. I suppose I could verify that easily enough. Use the same battery with pulsed current and then linear and measure the delta over a fixed time frame in a large water bath of known volume & temp.
Well...what a freaking lie!
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