Pulsating DC Charger for 12V Battery????
Gaetan Mailloux
Hi
My original post about Jud Williams pulsating charger, seem to bring out
many things about pulsating chargers.
I check in many battery books about that, and Jud Williams use too low
voltage for his pulsating charger, those books say that you need a minimum
of 14.5 volt, to, if I can say to show an image of what I've read, " push
back " the own voltage of the battery, and charge it. So the battery
become the load and not the source. Too low voltage , and the battery
oppose his own voltage against the charger, even if the charger have
rectifier, the battery are still the source and just become like a "wall"
for the charger voltage and current. So it will not charge or it will do
too little.
Gaetan
Charles Marks (cfm...@mixcom.com) writes:
> In article <4980oq$s...@ixnews3.ix.netcom.com>, ju...@ix.netcom.com says...
>
>>(1) In the first line of the posting you state "I am no electrical
>> person but....." The rest of the statement is totally incorrect
>> a lead acid battery is not a capacitor by any stretch of the
>> imagination.
>
> I quote Bode pg 291: "...lead storage battery behaves in a capacitive manner
> at frequencies as high as 10 kHz." Batteries do act "like" capacitors.
>
>>(2) If you have torn down batteries using the above charging techniques
>> (presumably this includes auto batteries that are charged using
>> pulsating DC and are lasting 5+ years) I think you do not know
>> the difference between a battery that has sulfation and one that
>> has suffered from extreme grid corrosion.
>
> I work strictly with industrial batteries and have torn down hundreds. The
> differences between a sulfated battery and a corroded grid battery are quite
> clear. How many batteries have you torn down?
>
>>(3) You have offered no explanations as to how you make your
>> measurements and since you are not an electrical person what
>> assurance would one have that your methods are valid?
>
> Using a scope across a shunt to monitor current flow magnitudes and
> directions.
>
>>(4) How about explaining how you measure a "net current flow" out of a
>> battery?
>
> Comparing "areas under the curves" and also validation using ampere-hour
> meters.
>
>>(5) Explain specifically how you were charging the batteries,ie:
>> charger circuit descriptions.
>
> Unfortunately, I do not have this info. Wish I did. It was one of a series
> of chargers being evaluated for a particular customer. One of the worst
> chargers was providing a peak current of over 70 amps with an average current
> of less than one amp. This charger was eventually used as a worst case
> situation to prematurely age batteries for test purposes.
>
>>(6) Did I note in one of your postings you thinking that pulsating DC
>> was AC and needed to be corrected?
>
> No. I simply neglected to make the distinction between "pulsed" DC and
> "pure" DC. For many people, the distinction does not matter but for lead
> acid batteries it does. VR lead acid batteries do not like to be charged on
> pulsed DC.
>
>>Jud Williams
>
> How about providing some proof, Mr. Williams, instead of trying to create
> side issues.
>
> Charles Marks
> Quantum Energy Consulting
> http://www.mixcom.com/bbs/bbhhbb/
>