8
5.
Grid (AC) Connection
5-1. Preparation
Before connecting to AC utility, please install a separate AC circuit breaker between inverter
and AC utility. This will ensure the inverter can be securely disconnected under load.
NOTE1: Although this inverter is equipped with a fuse (F1 point on PCB, 3KW: 250VAC/20A;
5KW: 250VAC/30A), it’s still necessary to install a separate circuit breaker for safety
consideration. Please use 250VAC/20A circuit breaker for 3KW and 250VAC/30A circuit
breaker for 5KW.
NOTE2: If you want to add a manual RCMU, it shall be type B.
WARNING! It's very important for system safety and efficient operation to use appropriate
cable for grid connection. To reduce risk of injury, please use the proper recommended cable
size as below.
Suggested cable requirement for AC wire
Model
External
Diameter(mm)
Conductor cross-section
(mm
2
)
AWG no. Temperature
3KW & 5KW
≦
4.5
≥3.3
≤12
125°C
5-2. Connecting to the AC Utility
Overview of AC Connection Socket
Component Description
A
AC output terminal on the inverter
B
Socket element
C
Protective element
D
Threaded sleeve
E
Sealing nut
F
Pressure dome
Step 1: Check the grid voltage and frequency with an AC voltmeter. It should be the same to
“VAC” value on the product label.
Step 2: Turn off the circuit breaker.
Step 3: Insert sealing nut (E) inside of threaded sleeve (D). Then, screw pressure dome (F)
tightly onto the assembled threaded sleeve. (Refer to Chart 1)
B
A
C
D E
F
Cable gland