Sustainable power shifting in the presence of an uninterruptible power supply

A system, comprising one or more computer processors;

• and a memory containing a program which when executed by the one or more computer processors performs an operation, the operation comprising:
• providing an uninterruptable power supply (UPS) to use for a load;
• determining a first subset of power supply units (PSUs) that are coupled to a first Power Distribution Unit (PDU) powered through the UPS, and a second subset of PSUs that are coupled to a second PDU not powered through the UPS;
• and
• conditioned upon a presence of a main power signal, shifting a predefined amount of the main power signal to the second subset of PSUs by providing a voltage control signal to operatively control the second subset of PSUs for power shifting and incrementally adjusting the voltage control signal for shifting the predefined amount.

A computer program product comprising a computer-readable storage medium having computer-readable program code embodied therewith, the computer-readable program code executable by one or more computer processors to perform an operation comprising:

• providing an uninterruptable power supply (UPS) to use for a load;
• determining a first subset of power supply units (PSUs) that are coupled to a first Power Distribution Unit (PDU) powered through the UPS, and a second subset of PSUs that are coupled to a second PDU not powered through the UPS;
• and
• conditioned upon a presence of a main power signal, shifting a predefined amount of the main power signal to the second subset of PSUs by providing a voltage control signal to operatively control the second subset of PSUs for power shifting and incrementally adjusting the voltage control signal for shifting the predefined amount.