Patent ID: 7511451

Claim:
An electrical energy source, comprising: an enclosure; at least two batteries electrically connected in series and being disposed in the enclosure; at least one battery charger being disposed in the enclosure, the battery charger being in electrical communication with a charging circuit including at least one half-wave bridge rectifier, at least one transformer, and at least one diode; at least one DC to AC power inverter being disposed in the enclosure; a DC driver circuit having an input connected to the batteries; the DC driver circuit having an output responsive to battery current detected at the DC driver circuit input; a DC output stage having a DC driver receiving input and a low voltage, high current output, the DC output stage being provided to perform a DC to DC conversion to reduce a voltage produced by the at least two batteries connected in series, the DC to DC conversion supplying input to drive the DC to AC power inverter; the DC output stage DC driver receiving input having a connection to the DC driver circuit output, the connection being provided to control the DC to DC conversion; the low voltage, high current output of the DC output stage being connected to an input of a DC filter; a first output of the DC filter being connected to an input of the at least one DC to AC power inverter; a second output of the DC filter being connected to a DC filter input of a control unit; a switch control output of the control unit being connected to an AC control switch in order to provide a switch control signal; an AC power output of the at least one DC to AC power inverter being connected to the AC control switch, the AC control switch having the capability to connect and disconnect the AC power output of the inverter to and from an AC outlet port responsive to the switch control signal from the control unit, the AC outlet port being disposed on the enclosure; the control unit having an AC input from an external source, the control unit having the capability to route the external source AC input to the charger for a predetermined charging time period; a timer, being operably connected to the charger and to the control unit in order to set the predetermined charging time period, the timer having at least one bi-directional electrical interface to the control unit; an on/off switch provided for powering up the electrical power source, and alternatively powering down the electrical power source; and, wherein when the electrical energy source is powered up and delivering electrical power to a load, the control unit, responsive to a change in the second output from the DC filter, interrupts electrical power delivery from the electrical energy source to the load and initiates recharging of the batteries for a predetermined time determinable by the timer after which predetermined time the control unit reestablishes power delivery to the load by the electrical energy source.