An electrical power supply device, comprising: a DC-DC power convertor configured to receive an input voltage and to produce an output voltage between a first voltage threshold and a second voltage threshold higher than the first voltage threshold; a first port in electrical communication with the DC-DC power convertor configured to supply electrical power to a first consumer device at a voltage between the first voltage threshold and the second voltage threshold; characterized by further comprising: a second port distinct from the first port and in electrical communication with the DC-DC power convertor configured to supply electrical power to a second consumer device only at a voltage equal to the first voltage threshold; a device controller in communication with the DC-DC power convertor, the first port, and the second port, said device controller having one or more processors and memory, wherein the memory includes instructions configured to cause the device controller to command the DC-DC power convertor to produce the output voltage between the first voltage threshold and the second voltage threshold in accordance with the first consumer device being connected to the first port and the second consumer device not being connected to the second port, wherein the memory further includes instructions configured to cause the device controller to command the DC-DC power convertor to produce the output voltage only at the first voltage threshold in accordance with the first consumer device being connected to the first port and the second consumer device being connected to the second port. a DC-DC power convertor configured to receive an input voltage and to produce an output voltage between a first voltage threshold and a second voltage threshold higher than the first voltage threshold; a first port in electrical communication with the DC-DC power convertor configured to supply electrical power to a first consumer device at a voltage between the first voltage threshold and the second voltage threshold; characterized by further comprising: a second port distinct from the first port and in electrical communication with the DC-DC power convertor configured to supply electrical power to a second consumer device only at a voltage equal to the first voltage threshold; a device controller in communication with the DC-DC power convertor, the first port, and the second port, said device controller having one or more processors and memory, wherein the memory includes instructions configured to cause the device controller to command the DC-DC power convertor to produce the output voltage between the first voltage threshold and the second voltage threshold in accordance with the first consumer device being connected to the first port and the second consumer device not being connected to the second port, wherein the memory further includes instructions configured to cause the device controller to command the DC-DC power convertor to produce the output voltage only at the first voltage threshold in accordance with the first consumer device being connected to the first port and the second consumer device being connected to the second port. a second port distinct from the first port and in electrical communication with the DC-DC power convertor configured to supply electrical power to a second consumer device only at a voltage equal to the first voltage threshold; a device controller in communication with the DC-DC power convertor, the first port, and the second port, said device controller having one or more processors and memory, wherein the memory includes instructions configured to cause the device controller to command the DC-DC power convertor to produce the output voltage between the first voltage threshold and the second voltage threshold in accordance with the first consumer device being connected to the first port and the second consumer device not being connected to the second port, wherein the memory further includes instructions configured to cause the device controller to command the DC-DC power convertor to produce the output voltage only at the first voltage threshold in accordance with the first consumer device being connected to the first port and the second consumer device being connected to the second port.