Abstract: A cable charger for generating a timed series of pulses of high d.c. voltage, comprising a battery, inverter, and rectifier means to produce a high voltage d.c., means responsive to a first timing means to connect said battery to said inverter at periodic intervals and means responsive to a second timing means to disconnect said inverter from said battery at a selected time interval after the connection of said inverter to said battery. An alternate embodiment includes means responsive to the voltage output of the rectifier means for disconnecting the inverter from the battery when the voltage output reaches a selected value E. The connecting means between the battery and the inverter can be relay means or solid state switching means.