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 13 Battery Management
Technical description SI4548_6048-US-TB_en-13 111
13.4.1 Boost Charge
The boost charge is the most common charging process of the Sunny Island. The boost charge ensures
a high generator workload through a high charging voltage over a short period of time. With liquid
FLA lead-acid batteries, this charge process should be used for gassing and thus compensating the
electrolytes. The boost charge process can charge the battery up to approx. 85% to 90%.
13.4.2 Full Charge
Every 14 days or eight nominal charge throughputs, the Sunny Island automatically initiates a full
charge (parameter "222.05 CycTmFul").
The objective is to recharge the battery to a state of charge of at least 95% and rectify possible effects
caused by an insufficient charge. Regular full charging approximately every two to four weeks can
double the battery life.
Nominal charge throughput
A nominal charge throughput is reached when the sum of the discharge currents corresponds
to the nominal capacity of the battery.
Example: The battery has a nominal capacity of 100 Ah. A nominal charge throughput is
reached when the battery has been discharged ten times for one hour by 10 A.
Change to a full charge
If the Sunny Island changes to full charge after a specific time of boost charge has elapsed, the
entire time of boost charge elapsed is considered for the full charge.
More than 1% of the nominal battery capacity is discharged
If more than 1% of the nominal battery capacity is discharged during a full charge, 50% of the
time elapsed is considered for the next constant voltage phase.
External charging device
If an external charging device or charge controller is connected to the battery and the criteria
for a full charge are fulfilled due to external charging, the Sunny Island treats this as if it had
performed the full charge itself.
Parallel procedures for full charge
Any parallel procedures causing the generator to stop during full charge are not taken into
account until the charging process is completed.