Connecting Rs485 To The Sunny Webbox - SMA SUNNY ISLAND 3.0M Installation And Quick Reference Manual

SMA Solar Technology AG
Position Designation
F Measuring cable of the
battery temperature sensor
G Control cable, load
shedding
H RS485 communication bus
I Data cable to
Sunny Remote Control
display
K Data cable to Sunny Island
Charger
L RS485 communication bus
− Data cable to lithium-ion
battery

4.3 Connecting RS485 to the Sunny WebBox

Figure 7: Connecting the RS485 communication bus to the Sunny WebBox
Position Designation
A Jumper J1A
B Jumper J1B and J1C
Installation - Quick Reference Guide
Description/information
Sunny Island: BatTmp terminal
You only have to connect a battery temperature sensor if lead-acid
batteries are used.
Mount the battery temperature sensor in the middle of the battery terminal,
in the upper third of the battery cell.
Sunny Island: Connect the control cable to the terminals Relay2 NO and
BatVtgOut − .
Inside the Sunny Island inverter, connect terminal Relay2 C and
BatVtgOut+.
Conductor cross-section: 0.2 mm² to 2.5 mm²
Sunny Island: at SI-COMSMA.BGx terminal ComSmaOut
Connection to other nodes, e.g., PV inverter
A terminator must terminate the RS485 communication bus on the last bus
node.
Sunny Island: Display terminal
Sunny Island: ComSync In terminal
An additional data cable must be connected from the terminal
ComSync Out to the battery only when lithium-ion batteries are used.
The communication bus must be equipped with a terminator on both ends.
Sunny Island: at SI-COMSMA.BGx terminal ComSmaIn
Sunny WebBox: terminal SMACOM
Only with lithium-ion batteries: additional data cable on terminal
ComSync In
Description/information
Terminator
If the Sunny WebBox is installed at the end of the communication bus,
a jumper must be inserted.
If the Sunny WebBox is installed between two nodes, the jumper must be
removed.
Signal bias voltage
Make sure that both jumpers are inserted.
4 Single System
Off-Grid-IS-en-30 19