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-13 107
13.1 Battery Temperature
The Sunny Island continuously monitors the battery temperature using the battery temperature sensor
provided. At 9°F (5°C) below the maximum permissible temperature (parameter "221.04
BatTmpMax"), a warning is displayed. If the maximum value for the battery temperature is exceeded,
the Sunny Island switches off.
A warning is given if the value for lead-acid batteries falls below 14°F (‒10°C) and below ‒4°F
(‒20°C) for NiCd batteries.
The battery temperature is taken into consideration when the charging voltage is calculated
(see Section 13.4 "Charge Control", page 109).
13.2 Start Options
If the battery is replaced in a plant, the battery management system must be restarted and
reconfigured. This can be done using the "Quick Configuration Guide" (QCG) (see Section 8.2
"Starting the Quick Configuration Guide (QCG)", page 67).
13.3 State of Charge (SOC) and State of Health (SOH)
State of Charge (SOC)
The Sunny Island has a very precise internal state of charge calculation (display value
"120.01 BatSoc"). The procedure for calculating the state of charge is based on balancing the
ampere hours. This means that all currents flowing in and out of the battery are accumulated and
referred to the nominal capacity. In order to take into consideration faults caused by self-discharge
and charging losses caused by gassing, these losses are already internally extracted. Unlike other
operations, no fixed charging factor must be set.
When the full charge states are reached, the battery state of charge is reset to values of 90%, 95%
or 100%, depending on how full the battery was actually charged. If default settings are not changed,
a state of charge of 90% after boost charge, 95% after full charge and 100% after equalization
charge is reached.
The battery may be destroyed due to deep discharge.
If the battery temperature sensor is defective or missing, the Sunny Island continues to run, assuming
a battery temperature of 104°F (40°C). This can result in deep discharge of the battery in the long
run.
• Observe the corresponding warnings of the Sunny Island.
• Connect the battery temperature sensor.
• Replace the defective battery temperature sensor.