A hybrid inverter generator , the generator comprising: an engine including a rotatable shaft ; an alternator including an AC alternator output, wherein the alternator is rotationally driven by the rotatable shaft to produce AC alternator power; a rectifier including a DC rectifier output and coupled to the AC alternator output, wherein the rectifier converts AC alternator power received from the AC alternator output to DC power and outputs the DC power along the DC rectifier output; an inverter including a DC inverter input coupled to the DC rectifier output, wherein the inverter inverts DC power received via the DC inverter input to AC power for supply to an AC load ; electrical terminals configured to be coupled to one or more batteries , wherein the electrical terminals are connected in parallel with the rectifier output and the DC inverter input; a controller operable to control the generator to operate in the following three modes: a battery-only mode, wherein the rectifier does not provide DC power along the DC rectifier output and the one or more batteries provide DC power to the DC inverter input, a battery charging mode, wherein the one or more batteries receive DC power from the DC rectifier output and the DC inverter input receives DC power from the DC rectifier output, and a boost mode, wherein the DC inverter input receives DC power from both the one or more batteries and the DC rectifier output; and wherein the controller is adapted to control speed of the engine according to a load condition; wherein the generator further comprises one or more battery receptacles for selectively receiving the one or more batteries to enable quick insertion and removal of the one or more batteries . an engine including a rotatable shaft ; an alternator including an AC alternator output, wherein the alternator is rotationally driven by the rotatable shaft to produce AC alternator power; a rectifier including a DC rectifier output and coupled to the AC alternator output, wherein the rectifier converts AC alternator power received from the AC alternator output to DC power and outputs the DC power along the DC rectifier output; an inverter including a DC inverter input coupled to the DC rectifier output, wherein the inverter inverts DC power received via the DC inverter input to AC power for supply to an AC load ; electrical terminals configured to be coupled to one or more batteries , wherein the electrical terminals are connected in parallel with the rectifier output and the DC inverter input; a controller operable to control the generator to operate in the following three modes: a battery-only mode, wherein the rectifier does not provide DC power along the DC rectifier output and the one or more batteries provide DC power to the DC inverter input, a battery charging mode, wherein the one or more batteries receive DC power from the DC rectifier output and the DC inverter input receives DC power from the DC rectifier output, and a boost mode, wherein the DC inverter input receives DC power from both the one or more batteries and the DC rectifier output; and a battery-only mode, wherein the rectifier does not provide DC power along the DC rectifier output and the one or more batteries provide DC power to the DC inverter input, a battery charging mode, wherein the one or more batteries receive DC power from the DC rectifier output and the DC inverter input receives DC power from the DC rectifier output, and a boost mode, wherein the DC inverter input receives DC power from both the one or more batteries and the DC rectifier output; and wherein the controller is adapted to control speed of the engine according to a load condition; wherein the generator further comprises one or more battery receptacles for selectively receiving the one or more batteries to enable quick insertion and removal of the one or more batteries . <EOS>