Communication Connections; Smart Meter & Ct Connections - Goodwe ET Series User Manual

User Manual V1.0-2021-06-15

2.5 Communication Connections

2.5.1 Smart Meter & CT Connections
Make sure the AC cable is totally isolated from AC power before connecting the Smart
Meter and CT.
A Smart Meter with the CT in product box is compulsory for ET system installation. It can be
used to detect the grid voltages and current directions, provide the operating condition of the
ET inverter via RS485 communications, and limit the power exportation. GM3000 or SEC1000S
are suggested. For more detailed information of the Smart Meter, refer to the Smart Meter user
manual in https://en.goodwe.com.
Note:
1. The Smart Meter with CT is already configured ; please do not change any settings on the Smart
Meter.
2. One Smart Meter can be used with only one ET inverter.
3. Three CTs must be used for one Smart Meter and must be connected on the same phase with the
Smart Meter power cable.
Smart Meter & CT connection diagram
To Smart Meter
Note:
1. Please use the Smart Meter with the 3 CTs contained in the product box.
2. The CT cable is 3m long as a default and can be extended to maximum of 5m.
3. The Smart Meter communication cable (RJ45) is attached on the inverter ("To Smart Meter" cable), and
be extended to a maximum length of 100m, and must use a standard RJ45 cable and plug, as shown
below:
Detailed pin functions of each port on the ET
BMS: CAN communication is configured by default. If 485 communication is used, please contact
the after-sales service to replace this with the correct communication cable.
02 Installation Instructions
Power Meter
CT A
CT B
CT C
15
L1
L2
L3
N
PE