Power supply

Abstract

The present invention is a power supply (,) that starts a load (,) with a heavy start-up power draw from a power grid (,) and then switches the load to a generator (,) for lower power draw operation thereby avoiding the need for a large capacity generator capable of initial start-up of the load (,). The power supply comprises a conductor (,) for connecting to a power grid, an electrical power generation device (,), an electrical power using device or load (,) and a switching mechanism (,) for 1) isolating the power grid (,) from the power generation device (,), 2) connecting the power grid conductor (,) to the electrical power using device (,) for the initial start-up of the power using device (,), and 3) connecting the power generation device (,) to the power using device (,) after initial start-up. In addition the power supply (,) can also serve as a backup source of power for multiple circuits whose total startup load exceeds the total output of the generator (,) during periods of grid power failure by selectively turning off interruptible circuit load (,) during the startup of other circuits (,) or allowing intermittent circuit loads (,) to complete their cycle and return to an off state prior to the start-up of other circuits (,).