Electrical Connections - Goodwe GW250K-HT User Manual

4.4 Electrical Connections

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
D
Model: M12
Size: a≤45 mm, 12.2 mm≤b≤13 mm
Code
Description
A1
Wire Length
A2
Wire Length
D
Conductor Length
S
Cross-Sectional Area of Conductor
Cross-Sectional Area of Conductor
S
PE
11
A1
D+3 mm
S
S
PE
A2 D+3 mm
PE
d
D
Model: M8
Size: 8.2 mm≤d≤9 mm
Value
﹥
500mm (the use of PVC wires is recommended)
A1-80mm
Cold terminal +3 mm
70-300 mm²
≥S/2
Step 2: Adjust the waterproof silicone ring
according to actual needs, and route the AC
cables through the ring.
Note: To ensure the equipment is sealed,
please adjust the aperture of the
waterproof silicone ring to match the
wire diameter.
Crimping with hydraulic pliers
Step 3: Remove the cover of the AC junction box with a hex wrench.
Step 4: Connect AC cables to
the terminal block.
Adjust aperture of waterproof silicone
ring with scissors
Heat shrink
tube
OT terminal
Tighten the heat shrink tube
with the heat gun
Remove
L1
L2
L3
PE
12