A power system for an aircraft. The power system comprises a power module unit and at least one mounting rail detachably coupled to the power module unit. The mounting rail provides structural support and electrical power to the power module unit. A power system in one embodiment may use mounting rails that double as power rails supplying power to the power module unit. Control is accomplished over a wireless link. The power rail control may be accomplished remotely via a standard or solid state relay. Normal rail power for the rail mounted power module may come from the utility bus.