SI4548-US-10 Manual
Table Of Contents
- 1 Information on this Manual
- 2 Sunny Island 4548-US/6048-US
- 3 Safety Precautions
- 4 Assembly
- 5 Opening and Closing
- 6 Electrical Connection
- 7 Control Elements
- 8 Initial Start-Up
- 9 Switching On and Off
- 10 Operation
- 11 Archiving Data on an SD Card
- 12 Additional Functions
- 12.1 Load Shedding
- 12.2 Sleep Mode
- 12.3 Time-Controlled Operation
- 12.4 Overload and Short-Circuit Behavior
- 12.5 Mixed Operation with Sunny Island inverters of Different Power
- 12.6 Device Faults and Autostart
- 12.7 Automatic Frequency Synchronization
- 12.8 Time-Controlled Standby
- 12.9 Behavior in the Event of a Failure in a Three-Phase System
- 13 Battery Management
- 14 Connecting External Sources
- 14.1 Generator
- 14.1.1 Parallel Connection
- 14.1.2 Generator Start Options
- 14.1.3 Generator Operation
- 14.1.4 Manual Generator Operation
- 14.1.5 Automatic Generator Operation
- 14.1.6 Limits and Power Control
- 14.1.7 Run Times
- 14.1.8 Operation Together with PV Inverters and Wind Power Inverters
- 14.1.9 Stopping the Generator
- 14.1.10 Stopping the Sunny Island
- 14.1.11 Disturbances
- 14.2 Grid
- 14.2.1 Limits of the Voltage Range and Frequency Range
- 14.2.2 Starting the Sunny Island
- 14.2.3 Operation in the Event of Grid Failure in a Grid-Tie Backup Configuration
- 14.2.4 Backup Operation and Anti-Islanding
- 14.2.5 Grid Reconnection
- 14.2.6 Grid Operation
- 14.2.7 Grid Failure
- 14.2.8 Disturbances
- 14.2.9 Limits and Power Control
- 14.2.10 Operation Together with PV Inverters and Wind Power Inverters
- 14.3 Generator and Grid
- 14.1 Generator
- 15 Relays
- 16 Multicluster Operation
- 16.1 Communication between the Sunny Island inverters
- 16.2 Initial Start-Up of the Multicluster System
- 16.3 Switching a Multicluster System On and Off
- 16.4 Generator Operation
- 16.5 Behavior with Different States of Charge
- 16.6 Testing the Multicluster Communication
- 16.7 Automatic Frequency Synchronization
- 16.8 Updating the Firmware
- 16.9 Error Handling in the Multicluster System
- 16.10 Grid Operation
- 16.11 Generator Emergency Operation
- 17 PV Inverters
- 18 Maintenance and Care
- 19 Parameter Lists
- 20 Troubleshooting
- 21 Accessories
- 22 Technical Data
- 23 Glossary
- 24 Contact
SMA America, LLC 9 Switching On and Off
Technical description SI4548_6048-US-TB_en-13 75
9.3 Switching Off
To switch off the Sunny Island, proceed as follows:
1. Stop the Sunny Island (see Section 9.2 "Stopping the Sunny Island (Standby)", page 74).
2. Switch the DC circuit breaker of the Sunny Island to "OFF".
☑ The Sunny Island is switched off.
9.4 Disconnecting the Device from Voltage Sources
1. Switch off the Sunny Island (see Section 9.3 "Switching Off", page 75).
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
Sunny Island 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 off-grid system 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 recommissioning, 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.
Damage to the Sunny Island and connected devices.
• Disconnect the loads only.
• Do not disconnect generators.
• Install an external load shedding contactor if the Sunny Island is coupled to PV arrays or wind
generators on the AC-generating side.