battery de-sulphators

[Deleted]

has anyone made one of these and had success, i made one up the other day and i was able to charge a previously knacked car battery, but the next time i used it, it went pop, the circuit uses a p channel fet, maybe a bipolar would be more reliable.
sean.

[Gary Lecomte]

Sometimes these devices work successfully. It depends on how bad the battery is and Why it went dead. Usually they work best on lead acid batteries that just have Silphided Plates.

N channel mosfets or typically more relilable. but you also need to stay within the rating of the mosfet. A Proper Heatsink is also a good idea.

Gary

[Jochen]

drpepper said:

has anyone made one of these and had success, i made one up the other day and i was able to charge a

If you meant these types who are firering big but single pulses, I
made forensic searches at one who was sealed with epoxy by the
manufacturer here in germany.
It fired about 80 (eighty) A every 30 seconds into the accu, using
its own energy which was astonishing for me.
I checked several car-accus, Pb-gel and crapped a lot of time,
I even checked the acid-density, mixed it new, refilled and so on.
Sometimes I thought it could have been worked well, but it did not.-
If you meant the types which uses frequencies and are as big as a
box of cigarettes, I read about that in forums and traced all positive
comments here in the german area back to the austrian person
who is earning a golden ass with it.
They are also useless and some of them are stinking in the 80m-
ham-band.
If could not check the positive article, told to be from the US-army,
about that.

regards Jochen

[aberro]

I buiult and use this one on my boat batteries. Works pretty good. How ell they work depends very much on the condition of your batteries when you start. If your batteries are badly sulphated it might take quite a while to clean off the sulphate or perhaps never.
Go here and see what they have to say. www.shaka.co/~kalepa/desulf.htm

Art

[Deleted]

Art, the link you provided does not work. -Opa

[Deleted]

Jochen:

>>comments here in the german area back to the austrian person who is earning a golden ass with it.

Well, Jochen, it really does work, only the circuit you described is unfamiliar to me. I have several of these desulphater circuits, including one from Elektor Magazine.

You need to choose one with a tuneable frequency.

A battery which still show a bit of life in it can be desulphated, but it may take months.
A totally dead battery will *never* come to life. -Opa