Switching On and Off
SMA America, LLC
74
SI5048U-TUS121440
Technical Description
9.3 Switching off
To switch off the Sunny Island, proceed as follows:
1. Stop the Sunny Island as described in section 9.2 ”Stopping (Standby)” (page 73).
2. Switch the Sunny Island's DC circuit breaker to the ”OFF” position.
☑ The Sunny Island is switched off.
9.4 Disconnecting the Device from Voltage Sources
1. Switch off the Sunny Island as described in section
9.3 ”Switching off” (page 74)
.
2. Disconnect the Sunny Island from the battery.
3. Disconnect the Sunny Island from the voltage sources (AC1 and AC2). Separate AC1 and AC2
and disconnect from voltage sources.
☑ When PV inverters connected to AC1 sense a power outage, they shut themselves down
automatically.
4. Check that the Sunny Island has been disconnected from voltage sources.
5. Wait at least 15 minutes to let the capacitors discharge and to allow the voltage inside the
device to drop to a safe level.
☑ The Sunny Island is free of voltage.
9.5 Reactivating the Device Following Automatic Shutdown
A complete shutdown indicates that components of the off-grid power system have failed or are not
working correctly due to incorrect parameter settings. Check the off-grid power system for possible
faults, both before and after reactivating the system, to avoid a complete shutdown in the future.
”Disconnection sequence”
Only with the sequence shown here can you ensure that all internal counter positions/
values are saved.
NOTICE
Damage to the Sunny Island and connected devices.
• Disconnect the loads only.
• Do not disconnect generators.
• Install an external load-shedding contactor if the off-grid power system on the AC
generating side is coupled to PV generators or wind generators.
