Changing the Battery Usage Through Battery-Backup Systems without Increased Self-Consumption


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Adjusting the default values

The parameters for battery usage are set automatically to reasonable values during basic configuration for the respective system. The parameter values can be adjusted if there are special requirements for the system or the battery.

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State of charge ranges of the battery according to the time of year (example)

Range

Explanation of the range and parameters

Behavior of the Sunny Island inverter

A

Backup power area (BuRes)

The Sunny Island uses this range for supplying the battery-backup grid when the utility grid fails. When the utility grid is available again, the battery is charged by the Sunny Island with nominal power from the utility grid.

Battery > Areas of application > Minimum width of backup power area

B

Deep discharge protection area (BatRes)

This range can only be reached when the utility grid fails.

The Sunny Island is switching to energy-saving mode. The Sunny Island starts up every two hours and attempts to charge the battery with PV energy. If the battery cannot be charged, the Sunny Island switches back to energy-saving mode.

When the utility grid is available again, the battery is charged by the Sunny Island with nominal power from the utility grid.

Battery > Areas of application > Minimum width of deep discharge protection area

C

Deep discharge area (ProtRes)

This range can only be reached when the utility grid fails.

When this range is reached, the Sunny Island switches off in order to protect the battery. When the utility grid is available again, the system must be charged manually (see Sunny Island operating manual).

Battery > Areas of application > Lower lmt deep disch. protect area prior shutdown

The following ranges result from the parameter default values:

Range

Lead-acid battery

Lithium-ion battery

Backup power area

15% to 100%

13% to 100%

Deep discharge protection area

10% to 15%

3% to 13%

Deep discharge area

0% to 10%

0% to 3%

Procedure for multicluster systems with battery-backup grid

With the Multicluster-Box 12 (MC-Box-12.3-20) and the NA-Box or Grid-Connect-Box, multicluster systems with battery-backup grid can be installed (see Multicluster-Box and NA-Box / Grid-Connect-Box documentation).

  1. In a multicluster system with battery-backup grid, set the ranges of battery state of charge for each cluster to the same values.

The basic procedure for changing operating parameters is explained in another section Changing Operating Parameters).

Procedure:

  1. Select Battery > Areas of application.
  2. Set the following parameters for increased self-consumption:
  3. Parameter

    Value

    Rise in self-consumption switched on

    Yes

    Lower lmt deep disch. protect area prior shutdown

    Range for protection during deep discharge as a percentage of the battery capacity

    Minimum width of deep discharge protection area

    Range for protection against deep discharge as a percentage of the battery capacity

    Minimum width of backup power area

    Range for battery-backup function

    If all ranges combined do not amount to 100%, the BuRes range will be increased automatically.

    Season operation active

    No