Patent ID: 8227938

Claim:
An uninterruptible power supply system comprising: a motor generator means for conditioning electric power; a backup generator means including an internal combustion engine having an electrically-driven starter, said electrically-driven starter operating at a voltage and an amperage provided by said motor generator means, said backup generator means for providing a backup supply of electric power; an electrical switch means electrically connected to a power mains and to an electrical output of said backup generator means and to an electrical input of said motor generator means, said electrical switch means for selectively switching power from the power mains and said backup generator means to said motor generator means; a starter switch means electrically connected to an output of the motor generator means and electrically connected to an input of said electrically driven starter of said backup generator means, said starter switch means for switchably connecting the output of said motor generator means to the input of said electrically-driven starter; a sensor means responsive to an output of said electrical switch means and electrically connected to said starter switch means, said sensor means for closing said starter switch means when a flow of electric power to said motor generator means is interrupted; and power conditioning means between and electrically connected to said starter switch means and said electrically-driven starter, said power conditioning means for conditioning the flow of electric power so said power delivered to said electrically-driven starter is at said voltage and said amperage.