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Maximized battery run-time in a parallel UPS system

  • US 8,271,146 B2
  • Filed: 12/03/2009
  • Issued: 09/18/2012
  • Est. Priority Date: 07/06/2005
  • Status: Active Grant
First Claim
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1. A method of controlling battery voltages in each of a plurality of uninterruptible power supply (UPS) modules, comprising:

  • reducing energy delivered from a first battery to a protected load to about zero;

    determining whether an inverter delivering power from a second battery to the protected load is overloaded;

    increasing the energy delivered from the first battery until the inverter is not overloaded;

    determining an overload runtime of the inverter;

    determining a battery runtime of the first battery; and

    if the battery runtime of the first battery is less than the overload runtime of the inverter, reducing the energy of the first battery such that the inverter is overloaded.

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