Abstract: A power system for a vehicle parking structure is disclosed. The power system comprises: a DC voltage bus arranged throughout the vehicle parking structure and configured to distribute DC power throughout the vehicle parking structure; at least one DC power source operably connected to the DC voltage bus and configured to provide DC power to the DC voltage bus; a plurality of DC loads arranged throughout the vehicle parking structure and operably connected to the DC voltage bus, the plurality of DC loads being configured to operate using DC power from the DC voltage bus; and a control system operably connected to the DC voltage bus and configured to communicate with at least one DC load in the plurality of DC loads using data signals transmitted via the DC voltage bus.

Abstract: A DC building electrical system includes a DC power consuming device connected to a DC bus. A source of DC power is connected to the DC bus and powers the DC power consuming device. An energy storage device is connected to the DC bus and to a DC emergency load. The energy storage device powers the DC power consuming device in conjunction with the source of DC power, and powers the DC emergency load when source of power other than the energy storage device is available to the DC power consuming device.

Abstract: A DC building electrical system includes a DC power consuming device connected to a DC bus. A source of DC power is connected to the DC bus and powers the DC power consuming device. An energy storage device is connected to the DC bus and to a DC emergency load. The energy storage device powers the DC power consuming device in conjunction with the source of DC power, and powers the DC emergency load when source of power other than the energy storage device is available to the DC power consuming device.

Abstract: A direct current power server configured to serve a direct current microgrid of a building. The direct current power server includes a direct current bus having branch circuits that extend from the direct current power server to provide direct current power to direct current loads of the building. The direct current power server directly integrates a local energy source and local energy storage into the direct current microgrid without attachment to the alternating current electrical grid.

Abstract: A power system for a vehicle parking structure is disclosed. The power system comprises: a DC voltage bus arranged throughout the vehicle parking structure and configured to distribute DC power throughout the vehicle parking structure; at least one DC power source operably connected to the DC voltage bus and configured to provide DC power to the DC voltage bus; a plurality of DC loads arranged throughout the vehicle parking structure and operably connected to the DC voltage bus, the plurality of DC loads being configured to operate using DC power from the DC voltage bus; and a control system operably connected to the DC voltage bus and configured to communicate with at least one DC load in the plurality of DC loads using data signals transmitted via the DC voltage bus.

Abstract: A DC building electrical system includes a DC power consuming device connected to a DC bus. A source of DC power is connected to the DC bus and powers the DC power consuming device. An energy storage device is connected to the DC bus and to a DC emergency load. The energy storage device powers the DC power consuming device in conjunction with the source of DC power, and powers the DC emergency load when source of power other than the energy storage device is available to the DC power consuming device.

Abstract: A DC building electrical system includes a DC power consuming device connected to a DC bus. A source of DC power is connected to the DC bus and powers the DC power consuming device. An energy storage device is connected to the DC bus and to a DC emergency load. The energy storage device powers the DC power consuming device in conjunction with the source of DC power, and powers the DC emergency load when source of power other than the energy storage device is available to the DC power consuming device.

Abstract: A direct current power server configured to serve a direct current microgrid of a building. The direct current power server includes a direct current bus having branch circuits that extend from the direct current power server to provide direct current power to direct current loads of the building. The direct current power server directly integrates a local energy source and local energy storage into the direct current microgrid without attachment to the alternating current electrical grid.

Abstract: Systems and methods are described for selectively applying DC power from a variable voltage DC power bus to a DC load. The ballast includes at least one switch coupled between the DC power bus and the DC load. A processor is coupled to the at least one switch and controls the operation of the at least one switch. A non-transient computer-readable memory stores instructions that are executed by the processor to control the operation of the processor. The processor determines a voltage on the variable voltage DC power bus and defines a pulse-width modulate power control signal based on the determined voltage. The at least one switch is then operated based on the pulse-width modulated power control signal to apply DC power from the DC power bus to the DC load at a first frequency.