I think I will give a try to my own take on a
desulfator/charger/demosser. I will use a PIC 18F4431 to control the
pulse width for the discharge & for the desulfator pulse. This is just
a prototype to try the output section. I am going to start at around 30v
but the supply can be increased later if needed. I'm using a new-to-me
opto isolator/driver to give fast MOSFET turn on/off times. I'll let
you know how it works.
-Bruce
BTW I'll try uploading the schematic in the files section.