Abstract: An apparatus including an alternator that is drivable by an engine for producing a first AC electric current, a rectifier in electrical communication with the alternator for producing a DC electric current, an inverter in electrical communication with the rectifier for producing a second AC electric current where the second AC electric current having an acceptable frequency and/or voltage, and the inverter in electrical communication with one or more electric loads responsive to the second AC electric current, and an energy storage device that is able to electrically couple to the alternator, rectifier, and/or inverter.

Abstract: A multiple port unit includes plural peripheral communications ports and two network ports for connect the peripheral devices with at least one remote controlling computer. Multiple port unit further includes a controller which interrogates network links coupled to the network ports and alternately switching network links. The controller also interrogates computers coupled to the network links and ascertains that a computer controlling devices coupled to the communication ports is working properly.