Questions Regarding the Battery

What happens if a battery is defective?

• Remove the defective battery cell from the battery system. This reduces the rated voltage of the battery by the voltage of the battery cell.

• Start the installation assistant on the inverter user interface.

• Select [Save and next] up to the step Battery configuration.

• Select the button [New battery configuration].

• Set the parameter Voltage to the actual rated voltage of the battery ( > Replacing the Battery).

Why is the SOC of the battery not 100% after completion of full charge?

The power requirements of the loads might have been so high before completion of the full charge that the battery could not be charged to 100%.

• Where necessary, select Battery > Charge and set the parameter Battery full charge time to a longer time period.

Why is the battery discharging even though the generator is running?

The Sunny Island may not have connected to the generator.

• Eliminate the cause ( > Questions Regarding the Generator).

The power of the loads might exceed the power of the generator.

What do you need to do after replacing a battery current sensor?

• Calibrate the battery current sensor (see the Commissioning section in the Sunny Island inverter installation manual).

May DC loads or DC energy sources be connected?

• The DC terminal of the inverter is exclusively intended for the connection of a battery with external battery fuse. Only DC loads or DC energy sources that are immune to electromagnetic interference must be used.

Why is the battery not charged with the maximum possible power?

Possibly the ambient temperature is too high or too low. With lithium-ion batteries, the battery management of the battery can also limit the charging power.

Can the charging performance of the battery be influenced?

• The charging capacity of the battery can be influenced by the maximum AC charging current. To do this, set Device parameters > Device > Inverter > Maximum AC-charging current to the value required.

What is the Discharge Cut-off voltage function?

• The Discharge Cut-off voltage function is relevant for voltage-controlled operation (V Loop) with a diesel generator as external energy source within off-grid systems. In this application, the Discharge Cut-off voltage function ensures that the battery only discharges up to a set voltage limit. The function Discharge Cut-off voltage can be used for lead-acid and lithium-ion batteries.