Energy storage device for a photovoltaic system, and method for operating an energy storage device of a photovoltaic system
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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Abstract
An energy storage device for a photovoltaic system includes: at least one first energy store which has a first cycle stability; at least one second energy store which has a second cycle stability, the first cycle stability being higher than the second cycle stability; and a control device which is designed to discharge the first energy store in a first operating mode and to discharge the second energy store in a second operating mode.
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Citations
12 Claims
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1. An energy storage device for a photovoltaic system, comprising:
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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, and the 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, and the 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A control device for an energy storage device, wherein the energy storage device includes at least one first energy store which has a first cycle stability and at least one second energy store which has a second cycle stability, the first cycle stability being higher than the second cycle stability, the control device comprising:
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a first connection for connecting to the at least one first energy store which has the first cycle stability; a second connection for connecting to the at least one second energy store which has the second cycle stability; and a control element 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 element connects to the first energy store via the first connection and connects to the second energy store via the second connection, 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 a photovoltaic system that generates 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, and the 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, and the 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. - View Dependent Claims (9)
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10. A method for operating an energy storage device of a photovoltaic system, the energy storage device having a first energy store which has a first cycle stability and a second energy store which has a second cycle stability, the first cycle stability being higher than the second cycle stability, the method comprising:
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selectively establishing one of a first operating mode or a second operating mode; discharging the first energy store in the first operating mode; and discharging the second energy store in the second operating mode, wherein a 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, and the 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, and the 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. - View Dependent Claims (11, 12)
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Specification