Hey all.

Got the SS SSG working, without frying any more parts, thanks SkyWatcher.

Now i was wandering, if anyone could give me a rough idea on frequencies to use when charging/desulfating batteries.
Is there a rule of thumb, or something more accurate, or a site where it is explained more?

The charger has the following properties:
pot at 0 Ohm, 520Hz, input 12V 1.6A, output open 650V, charges old 12V lead acid battery at 12.62V and increasing VERY slowly
pot at 1KOhm, 2003Hz, input 12V 0.4A, output open 120V, charges old 12V lead acid battery at 12.43V.

Battery used is a 12V lead acid battery out of a car, which did not start engine any more and was at 11.86V when I got it.

Did the 1 Ohm test like on the SSG, but can get it only up to 0.75V and the 1/4W resistor starts smoking

Are the lower frequencies better for charging and higher frequencies better for desulfating?
Or do you pick lowest amp draw for highest charge?

Cheers
Martin