SMA Solar Technology AG
10 Troubleshooting
Operating Manual
SI80H-BE-BEN120810
63
10.6 Charging the Battery after Automatic Shutdown
When a battery is deeply discharged, the off-grid inverter shuts down automatically and you cannot
restart it. In order to start the off-grid inverter again after an automatic shutdown, you must charge the
battery in emergency charge mode.
In emergency charge mode, the off-grid inverter does not form a separate stand-alone grid, and you
can charge the battery using a generator. Battery management is active in emergency charge mode
and the off-grid inverter charges the battery in accordance with the parameter settings. In standby
mode or in the QCG, you can adapt the parameters for the battery, e.g. the battery nominal voltage,
if a battery cell fails.
Requirement:
☐ The Sunny Remote Control must be connected to the master.
Procedure:
• Connect the generator to terminal AC1.
• Charge the battery.
• Disconnect the generator from terminal AC1.
• Start the off-grid system.
Connecting the Generator to Terminal AC1
1. Disconnect the off-grid inverter from voltage sources (see Section 8).
2. If a generator is installed permanently in the off-grid system, bridge the terminals AC1 and AC2.
3. If a mobile generator is used, connect the generator to terminal AC1 (see the installation manual
of the off-grid inverter).
4. Close the off-grid inverter (see commissioning in the off-grid inverter installation manual).
Danger to life due to high AC voltages
In order to charge the battery after automatic shutdown of the off-grid inverter, the installation of the
off-grid inverter must be changed.
• Only skilled persons may charge the battery after automatic shutdown of the off-grid inverter.
Restricted management functions in emergency charge mode
In emergency charge mode, the generator management is not active. The limits for voltage,
current and frequency are not monitored. Set the maximum current consumption of the off-grid
inverter for charging the battery in emergency charge mode. The off-grid inverter does not
record additional stress on the generator caused by loads.
