A portable power supply has a housing, a plurality of battery cells, a sensor, an inverter, and a modular outlet panel. The housing defines an opening and a cavity therein. The battery cells are disposed in the cavity. The sensor is electrically coupled to the battery cells. The inverter is electrically coupled to the battery cells. The inverter is disposed in the cavity. The modular outlet is removably coupled to the housing. The modular outlet panel is disposed over a majority of the opening.