Electrical Connections - Goodwe HT Series User Manual

4.4 Electrical Connections

The PV string output cannot be grounded. Make sure that the PV insulation resistance to the
ground meets the minimum requirement before connecting the PV string to the inverter.
4.4.1 AC Terminal Connection
1. Measure the voltage and frequency of the grid-tied connection point to make sure that they meet
the requirements for the grid-tied inverter.
2. An extra AC circuit breaker or fuse is recommended. The specification of the breaker or fuse should
be 1.25 times of AC output rated current.
3. PE cable of the inverter must be grounded reliably.
4. Disconnect the circuit breaker or fuse between the inverter and grid-tied connection.
5. Follow the steps below to connect the utility electric and the inverter.
Note: Do not connect copper blocks with aluminum wires. Otherwise electrochemical corrosion will
occur.
• If copper cables are applied, please use copper wiring terminals.
• If copper-clad aluminum cables are applied, please use copper wiring terminals.
• If aluminum alloy cables are applied, please use copper-aluminum transition wiring terminals.
Step 1: Select a suitable AC cable and strip it. For specific specifications, refer to the table
below.
L1/L2/L3
a b
Model: M12
Size: a≤45 mm, 12.2 mm≤b≤13 mm
Code Description
A1
Wire Length
A2
D Conductor Length
S
Cross-Sectional Area
of Conductor
S
PE
D
﹥500mm (the use of PVC wires is recommended)
A1-80mm
Cold terminal +3 mm
70-300 mm²
≥S/2
A1
D+3 mm
A2 D+3 mm
PE
d
D
Model: M8
Size: 8.2 mm≤d≤9 mm
11
S
S
PE
Value