Abstract: A portable power inverter having a pass through device to facilitate connection and operation of both A.C. and D.C. power consuming devices to a single outlet of a single D.C. power source. Inverter circuitry is electrically coupled to the external D.C. power source for inverting D.C. voltage to an A.C. voltage source. A.C. electrical outlets are provided to facilitate a connection to an external A.C. power-consuming device. The pass through device provides an independent and simultaneous connection to an additional D.C. outlet to allow connection an external D.C. power-consuming device. The pass through device allows connection of D.C. consuming devices that would otherwise be connected directly to the external D.C. power source while the inverter is so connected thus allowing connection and operation of both A.C. and D.C power consuming devices through a single external D.C. power outlet of a single D.C. power source.