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Energy storage device for a photovoltaic system, and method for operating an energy storage device of a photovoltaic system

  • US 10,381,863 B2
  • Filed: 07/09/2013
  • Issued: 08/13/2019
  • Est. Priority Date: 07/13/2012
  • Status: Active Grant
First Claim
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1. An energy storage device for a photovoltaic system, comprising:

  • at least one first energy store which has a first cycle stability;

    at least one second energy store which has a second cycle stability, wherein the first cycle stability is higher than the second cycle stability; and

    a control device configured to discharge the first energy store in a first operating mode and to discharge the second energy store in a second operating mode, wherein the control device has a first connection for the first energy store and a second connection for the second energy store, the first connection and the second connection being separate from one another, wherein the control device is coupled to the first and second energy stores in order to enable electrical power from the first energy store and the second energy store to flow through the control device, wherein;

    the control device is directly coupled to electric consumers that consume electrical power,the control device is coupled to the photovoltaic system, the photovoltaic system generating electrical current from solar energy,the first energy store is configured as a lithium-iron phosphate accumulator,the second energy store is configured as a lead accumulator, andthe second operating mode is an operating mode in which;

    the first energy store and the second energy store are not chargeable by the photovoltaic system on account of the photovoltaic system having ceased to generate the electrical current,a delay occurs between a time at which the photovoltaic system ceases to generate the electrical current and a time at which the second energy store begins to be discharged from a fully charged state,during the delay the first energy store is discharged until a time at which a state of charge of the first energy store is discharged to a predefined lower limiting value, andthe time at which the state of charge of the first energy store is discharged to the predefined lower limiting value coincides with the time at which the second energy store begins to be discharged from a fully charged state.

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