5.
Grid (Utility) Connection
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5. Grid (Utility) Connection
5-1. Preparation
Before connecting to AC utility, install a
separate
AC circuit breaker between inverter and
AC utility. This will ensure the inverter can be securely disconnected for maintenance and is
fully isolated from the AC input.
NOTE1:
Although this inverter is equipped with a 250VAC/30A fuse, it’s still necessary to
install a separate circuit breaker for safety consideration. Use a 250VAC/30A circuit breaker
between inverter and AC utility.
NOTE2:
The overvoltage category of the AC input is III. It should be connected to a power
distribution board.
WARNING!
It's very important for system safety and efficient operation to use appropriate
cable for grid (utility) connection. To reduce risk of injury, use the recommended cable size
as below:
Suggested cable requirement for AC wire
Model
2KW
3KW
3KW Plus
Nominal Grid Voltage
101/110/120/127 VAC
208/220/230/240 VAC
Conductor cross-section (mm
2
)
4 to 6 mm²
AWG no.
10 to 12
5-2. Connecting to the AC Utility
Step 1:
Check the grid voltage and frequency with a voltmeter. It should be the same as
“VAC” values on its label.
Step 2:
Turn off the circuit breaker.
Step 3:
Remove insulation sleeve 8 mm for three conductors.
Chart 1
Reduce de-insulated L and neutral conductors to 3 mm. Refer to
chart 1.
Step 4:
Connect wires according to polarities indicated on terminal block. Be sure to connect
PE protective conductor (
)
first.
