A two-voltage battery for a vehicle, having at least one ground terminal, a first vehicle electrical system connection at which a low, first vehicle electrical system voltage is provided, and a second vehicle electrical system connection at which a high, second vehicle electrical system voltage is provided. At least one battery submodule having at least two battery cell blocks and a multiplicity of switching elements is provided for connecting the battery cell blocks in parallel and/or in series as desired. In a first connection arrangement, the same are connected in parallel with one another such that the first vehicle electrical system voltage is provided at the first vehicle electrical system connection. The switching elements in a second connection arrangement connect the battery cell blocks in series with one another such that the second vehicle electrical system voltage is provided at the second vehicle electrical system connection.

Aspects extend to methods, systems, and computer program products for balancing input phases across server rack power supplies. A rack manager can monitor individual Alternating Current (AC) phase currents at the rack level. The rack manager knows (or can at least determine) which power supplies are connected to which phase. The rack manager can micro adjust individual PSU output voltages to balance current phases at the rack level. Balancing can occur in response to changed server workloads, hot-unplug of one or more servers, etc. When there is one PSU per server, phase balancing can be accomplished by connecting outputs of power supplies together via busbar or wire. Output voltages of individual power supplies can be adjusted to achieve better phase balancing. Phase imbalance can be corrected by a bus bar or wire carrying enough load to correct phase imbalance.

A system for supplying electrical power to a plurality of vehicles from a central power supply through a plurality of electrical outlets includes an outlet control unit for each of the outlets and a vehicle control unit for each of the vehicles. The outlet microprocessor switches the supply of power to the outlet to communicate data to the vehicle. The vehicle microprocessor communicates data by switching a load across the power supply to provide interaction between the microprocessors to manage requirement and availability of power. The data includes whether the power plant of the vehicle is gasoline powered, diesel powered, hybrid or electric battery powered. The microprocessor of the vehicle control unit is arranged to control switches which supply power to selected loads in the vehicle and includes an interface which is arranged to connect to a Canbus communication system of the vehicle.

An apparatus may determine a parameter related to a voltage value at a midpoint terminal of a system power device, and may adjust a voltage applied to a second terminal of the system power device based on the parameter and a reference value. The second terminal may be different from the midpoint terminal.

An apparatus may determine a parameter related to a voltage value at a midpoint terminal of a system power device, and may adjust a voltage applied to a second terminal of the system power device based on the parameter and a reference value. The second terminal may be different from the midpoint terminal.

A direct current power system. The direct current power system includes a direct current bus system, a solar power system, an energy storage system, a wind power system, a rectifier system and an inverter system. The solar power system includes a plurality of solar panels, is electrically coupled to the energy storage system and is configured to supply a first direct current power at 48 volts. The energy storage system includes a plurality of battery stacks and is configured to supply a second direct current power at 380 volts to the direct current bus system. The wind power system includes at least one wind turbine assembly and is configured to supply a third direct current power at 380 volts to the direct current bus system. The rectifier system is configured to supply a fourth direct current power at 380 volts to the direct current bus system.

A hybrid energy storage module system includes a first power stage having a short circuit switch to connect the first power stage to a power bus, a second power stage stacked in series with the first power stage and having a short circuit switch to connect the second power stage to the power bus, and a controller. The controller is operably connected to the first and second power stage short circuit switches to discharge one of the first and second power stage through the other of the first and second power stage in a state of charge balancing mode. Aircraft electrical systems and methods of controlling connectivity of hybrid energy storage modules to electrical systems are also described.

A hybrid energy storage module system includes a first power stage having a short circuit switch to connect the first power stage to a power bus, a second power stage stacked in series with the first power stage and having a short circuit switch to connect the second power stage to the power bus, and a controller. The controller is operably connected to the first and second power stage short circuit switches to discharge one of the first and second power stage through the other of the first and second power stage in a state of charge balancing mode. Aircraft electrical systems and methods of controlling connectivity of hybrid energy storage modules to electrical systems are also described.

A vehicle electric system for a vehicle may include a first vehicle electric system branch having a first energy store and a first dynamic electric load, a second vehicle electric system branch having a second sensitive electric load, and a first controllable switching device arranged between the first and second vehicle electric system branches and designed to assume (a) a first switch state in which a current is conducted unidirectionally from the first vehicle electric system branch to the second vehicle electric system branch only in a first current flow direction or (b) a second switch state in which a current is conducted bidirectionally between the second vehicle electric system branch and the first vehicle electric system branch both in the first current flow direction as well as in a second current flow direction.

A vehicle electric system for a vehicle may include a first vehicle electric system branch having a first energy store and a first dynamic electric load, a second vehicle electric system branch having a second sensitive electric load, and a first controllable switching device arranged between the first and second vehicle electric system branches and designed to assume (a) a first switch state in which a current is conducted unidirectionally from the first vehicle electric system branch to the second vehicle electric system branch only in a first current flow direction or (b) a second switch state in which a current is conducted bidirectionally between the second vehicle electric system branch and the first vehicle electric system branch both in the first current flow direction as well as in a second current flow direction.