Questions Regarding Multicluster Systems; Forgotten Password - SMA SUNNY ISLAND 4.4M Operating Manual

SMA Solar Technology AG
The Sunny Island does not reconnect to the generator after disconnection from the generator due
to non-compliance with the thresholds for voltage and frequency – why?
The Sunny Island is switched with a hysteresis, i.e., the thresholds for connection do not correspond to the thresholds
for disconnection.
• To unload the generator, disconnect unnecessary loads.
• Wait until the voltage and frequency have reached the nominal values.

14.5.4 Questions Regarding Multicluster Systems

Extension clusters remain in standby or energy-saving mode even though the main cluster is in
inverter mode?
The data cable between the masters of the individual clusters might not be connected. The master of the main cluster
cannot forward the "Start" command to the masters of the extension clusters.
Why is the multicluster system not supplying full power?
An extension cluster or individual Sunny Island inverters of an extension cluster might have failed.
Why are high levels of energy being transferred between the clusters in the multicluster system?
The state of charge of the batteries might differ temporarily. The off-grid system equalizes different states of charge
automatically.
The nominal frequencies and nominal voltages may be defined differently.
• Select Device > Inverter and set the parameters Inverter nominal voltage and Inverter nominal frequency
to the same value for all masters.
The battery capacities might differ significantly.
• Distribute the battery capacities to the clusters as evenly as possible.
Individual battery cells of a battery might have failed.
• Disconnect defective battery cells and set the new rated voltage and capacity (see Section 13.8, page 135).
14.6

Forgotten Password

Password assignment for inverters that are registered in a communication product
The password for the user group Installer is also the system password for the PV system in the communication
product. Changing the password of the user group Installer can lead to the inverter no longer being able to be
reached by the communication product.
• In the communication product, assign the changed password of the user group Installer as the new system
password (see the manual of the communication product).
If you have forgotten the password for the inverter, you can unlock the inverter with a Personal Unlocking Key (PUK).
For each inverter, there is 1 PUK for each user group (User and Installer). Tipp: With PV systems that are registered in
a communication product, you can also assign a new password for the user group Installer via the communication
product. The password for the user group Installer is the same as the system password in the communication product.
Procedure:
1. Request PUK (application form available at www.SMA-Solar.com).
2. Open the user interface (see Section 8.1, page 104).
3. Enter the PUK instead of the password into the field Password.
Operating manual
14 Troubleshooting
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