Switching On and Off SMA Solar Technology AG
64 SI5048-TB-TEN110340 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 the Sunny Island (Standby)”
(page63).
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” (page64).
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.
☑ If PV inverters are connected to AC1, they automatically switch off once they are no longer
connected to the stand-alone grid.
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 stand-alone grid components have failed or are not working
correctly due to incorrect parameter settings. Check the off-grid system for possible faults, both before
and after reactivating the system, to avoid a complete shutdown in the future.
To reactivate the Sunny Island after it has switched off due to a battery being too deeply discharged,
proceed as follows:
"Switching sequence"
Only with the sequence shown here can you ensure that all internal meter positions/values
are saved.
NOTICE!
If the Sunny Island switches off automatically, the Sunny Island and connected
devices will be damaged.
• Disconnect the loads only.
• Do not disconnect generators.
• Install external load-shedding protection in case the Sunny Island is coupled to
PV generators or small wind generators on the AC-generating side.
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