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Storage system that maximizes the utilization of renewable energy

  • US 7,800,247 B2
  • Filed: 05/30/2008
  • Issued: 09/21/2010
  • Est. Priority Date: 05/30/2008
  • Status: Active Grant
First Claim
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1. An energy storage system, comprising a plurality of battery modules, electrically connected in parallel, each plurality of battery modules having an inverter electrically connected thereto to form a plurality of battery modules and inverter combination, the inverter having an AC output connected to one or more energy consuming devices and an AC input connected to a power grid,each battery module of said plurality of battery modules having electrical properties similar to the remaining battery modules, andeach of the battery module having a maximum power output rating equal to or greater than a continuous maximum output power rating of the inverter, whereinthe plurality of battery modules and inverter combination is controlled to be in one of system control modes, said system control modes comprising:

  • 1) an over-charge mode, wherein if a voltage detected from said battery module V is >

    a sustainable high voltage limit VH of the inverter, than then the inverter function is abandoned until a lower voltage limit VH

    is reached;

    2) an over-discharge mode, wherein if V<

    a preset voltage VL, than then the inverter is disconnected from the plurality of battery modules and the AC input of the inverter connected to the grid AC power source is connected, while disconnecting the battery power source, to the one or more energy consuming devices;

    3) a recharge mode, wherein if V<

    a preset voltage V″ and

    if the time of day T is within a preset range R, then the plurality of battery modules is recharged from the inverter AC input connected to the power grid; and

    4) a normal operating mode, wherein if V is VH and if V is ≧

    VL and if T is not in the range R then the plurality of battery modules is connected to the inverter for providing energy through the inverter AC output to the one or more energy consuming devices.

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