Hi,

actually, looking at the two different schematics of an SSG and solid-state charger, it looks like the SSG has a direct feedback of the battery's state (impedance) while a solid state has not.

I'm trying to bring back a sulfated old battery with a solid state charger. Now it strikes me that it would be better to have a SSG doing that because the circuit will adapt while the battery is improving, while a solid state has always the same impedance, since it always sees the same capacitor and the 3rd (output) coil has no feedback into the first oscillating circuit.

Any insights or comments on this?

Terence.