6 Electrical Connection
SMA Solar Technology AG
Operating manual
SI44M-80H-13-BE-en-15
42
PIN assignment for CAN battery communication:
Pin
Assignment
2
CAN Ground
4
CAN High
5
CAN Low
Procedure:
1. Plug the data cable into a free pin connector
ComSync
on the Sunny Island (see Section 6.6.4, page 59).
2. Connect the other end of the data cable to the battery management of the lithium-ion battery (see battery
manufacturer documentation).
3. Ensure that the communication bus is closed at each end, e.g. with a terminator.
6.5.7.3
Connecting the Data Cable for the Internal Communication of the Cluster
In a cluster, the Sunny Island inverters communicate via a data cable (as included in the scope of delivery of this
inverter).
NO C
NC
Relay 1
NO C
NC
Relay 2
A
B
NO C
NC
Relay 1
NO C
NC
Relay 2
NO C
NC
Relay 1
NO C
NC
Relay 2
MASTER
SLAVE 1
SLAVE 2
Figure 8: Internal communication cabling (example)
Requirements:
☐ The total length of the communication bus (A+B) must be less than 30 m. Keep in mind that the communication
bus possibly connects several nodes.
Procedure:
1. Plug the data cable into a free pin connector
ComSync
on the Sunny Island (see Section 6.6.4, page 59).
2. Ensure that the communication bus is closed at each end, e.g. with a terminator.
6.5.7.4
Connecting the Data Cable of the Multicluster-Box
For a multicluster system, the Multicluster-Box communicates with the master of the main cluster via a black data cable
(see Multicluster-Box documentation). The black data cable is part of the scope of delivery of the Multicluster-Box.
Requirements:
☐ The total length of the communication bus must not exceed 30 m. Keep in mind that the communication bus
possibly connects several nodes.
