Battery Use by Battery-Backup Systems with Increased Self-Consumption


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State of charge ranges of the battery in battery-backup systems

Range

Parameter (technical term)

Battery inverter behavior

A

Self-consumption range (SlfCsmp)

The battery inverter uses the batteries within this range for increased self-consumption and for the "Time-of-Use" and "Peak Load Shaving" functions that can be configured in the power profile.

C

Minimum width of backup power range (BURes)

Range for battery-backup operation during grid failure This range is set to 0% by default. If an automatic transfer switching device is connected, the range must be set depending on your needs. The setting value refers to the user SOC.

Utility grid available:

When the upper limit of C is reached, the battery inverter goes into standby mode. The batteries remain switched on. Excess PV energy is used for conserving the battery charge.

When the SOC in range C has decreased by the set value of range B, the battery inverter recharges the batteries with 3 A from the utility grid.

If the set value of the parameter for range B is less than the set value of the parameter for range C, the batteries are recharged in range D first.

B

Range for maintaining battery state of charge (PVRes)

Utility grid available:

The battery inverter checks the current SOC every 24 hours. If the SOC is in range D, the batteries are recharged with 3 A from the utility grid until the upper limit of range C is reached.

During battery-backup operation:

The battery inverter starts up every two hours for approx. six minutes and attempts to charge the batteries with PV energy. If no excess PV energy is available, the battery inverter switches to standby mode.

D

Minimum width of deep-discharge protection range (BatRes)

Once the limit from B to D is reached, the battery and battery inverter switch off. The battery-backup operation can be enabled by switching on the black-start switch of the battery inverter. If the battery is not recharged after six minutes, the battery-backup operation will be stopped. No automatic start-up process will be initiated after two hours.

When range D is reached and the utility grid is available, the battery inverter charges the batteries with 3 A from the utility grid.

E

Lower limit of the deep-discharge protection range for disconnection (ProtRes)

If range E is reached during battery-backup operation, the batteries are switched off. The battery inverter is also switched off due to a lack of DC voltage.

When range E is reached and the utility grid is available, the battery inverter charges the batteries with 3 A from the utility grid until range A is reached.