Rather than use an inductor, capacitor or resistor to 'ring' the battery, why
not just connect a
24V source via a MOSFET. This should have several advantages:

* Unlimited pulse frequency, like the resistive approach

* Minimal losses, since of the transistor and diode in the Couper design, the
diode wastes
the most energy.

* Keeps the battery topped off

It would also seem like it might offer the simplest of designs. Am I missing
something, for I
am not aware of anyone trying this approach.