Questions Regarding The Battery - SMA SUNNY ISLAND 4.4M Operating Manual

SMA Solar Technology AG
• In a three-phase system, all 3 line conductors of the external energy source must be connected
• In a single-phase parallel system, it is possible to connect the generator to the master only.
• The external energy source must have a valid voltage during current-controlled generator operation mode,
otherwise the generator will not be switched on. If the generator or the utility grid switches off unexpectedly
during current-controlled generator operation, the Sunny Island restarts. The electrical loads are not supplied for a
short time.

14.5.2 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 (see Section 13.8, page 135).
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 (see Section 14.5.3, page 170).
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?
Operating manual
14 Troubleshooting
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