7
5.
Grid (Utility) Connection
5-1. Preparation
NOTE 1: The overvoltage category of the AC input is III. It should be connected to the
power distribution.
NOTE 2:
Before connecting to grid, please install a separate AC breaker between
inverter and grid. This will ensure the inverter can be securely disconnected during
maintenance and fully protected from over current. The recommended of AC breaker is
40A/300V.
WARNING! It's very important for system safety and efficient operation to use
appropriate cable for grid (utility) connection. To reduce risk of injury, please use the
proper recommended cable size as below.
Suggested cable requirement for AC wire
Nominal Grid Voltage
120VAC per phase
Conductor cross-section (mm
2
)
10-16
AWG no.
8-6
5-2. Connecting to the AC Utility
Please follow below steps to implement AC input connection:
1.
Before making AC input connection, be sure to open DC protector or disconnector
first.
2.
Remove insulation sleeve 7mm for four conductors.
3.
Insert AC input wires according to polarities indicated on terminal block and tighten
the terminal screws. Be sure to connect PE protective conductor (
) first.
→
Ground (yellow-green)
L1
→
LINE (black)
L2
→
LINE (brown)
N
→
Neutral (blue)
WARNING:
Be sure that AC power source is disconnected before attempting to
hardwire it to the unit.
