SMA SUNNY ISLAND 3.0M - Connecting RS485 to the Sunny Webbox

SMA Solar Technology AG 4 Single System
Installation - Quick Reference Guide Off-Grid-IS-en-30 19
4.3 Connecting RS485 to the Sunny WebBox
Figure7: Connecting the RS485 communication bus to the Sunny WebBox
F Measuring cable of the
battery temperature sensor
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.
G Control cable, load
shedding
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
H RS485 communication bus 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.
I Data cable to
Sunny Remote Control
display
Sunny Island: Display terminal
K Data cable to Sunny Island
Charger
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.
L RS485 communication bus Sunny Island: at SI-COMSMA.BGx terminal ComSmaIn
Sunny WebBox: terminal SMACOM
− Data cable to lithium-ion
battery
Only with lithium-ion batteries: additional data cable on terminal
ComSync In
Position Designation Description/information
AJumper J1A 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.
BJumper J1B and J1C Signal bias voltage
Make sure that both jumpers are inserted.
Position Designation Description/information