SMA Off-Grid Systems User Manual
Page 27
SMA Solar Technology AG
5 Single-Cluster System
Installation - Quick Reference Guide
Off-Grid-IS-en-30
27
B
AC power cable of the
generator
Sunny Island: terminal AC2 Gen/Grid terminals L, N, and PE
Generator: connect master to line conductor L1.
Conductor cross-section: maximum 16 mm²
For a single-phase system, the cable length and the conductor
cross-section must be identical on each Sunny Island.
The Sunny Island must be connected via a grounding conductor on the
terminal AC1 or AC2 to the ground potential. The conductor cross-section
of the grounding conductor must be 10 mm² or larger. If the conductor
cross-section is smaller, an additional grounding conductor on the
enclosure with the conductor cross-section of the AC power cable must
connect the Sunny Island with the ground potential.
C
DC+ cable
Battery terminal
For a single-phase system, the cable length and the conductor
cross-section must be identical on each Sunny Island.
Conductor cross-section: 50 mm² to 95 mm²
Cable diameter: 14 mm to 25 mm
D
DC − cable
E
Control cable, generator
Sunny Island: terminals Relay1 NO and Relay1 C
Conductor cross-section: 0.2 mm² to 2.5 mm²
F
Measuring cable of the
battery temperature sensor
Sunny Island: terminal BatTmp
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 control cable to terminals Relay2 NO and
BatVtgOut − .
Inside the Sunny Island inverter, connect terminals 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 for the internal
communication in the cluster
Sunny Island: ComSync Out terminal
Only with lithium-ion batteries: additional data cable on terminal
ComSync In
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