Installation and Operation Manual 45
8.3 Electric connection
8.3.1 Requirement for electric installation
●
Photovoltaic array
The open-circuit voltage for photovoltaic array cannot exceed
1000V with allocated power for it of 22KW. (Take KSG-20K as
example)
Recommended maximum power for photovoltaic
array: 22KW
Maximum open-circuit voltage for array: 1000V
●
Three-phase grid
The grid is detected continuously by KSG-10K/12K/15K/17K/
20K inverter to refer to whether it can meet the grid connection
condition. The grid limitation for grid condition is as follows.
Meanwhile, the grid-connected inverter should be installed with
permit of local electric department.
Voltage of three phase grid: 184V~277V
Frequency of grid: 50/60Hz
●
Connected wire
Select the inner diameter of 12AWG (4mm
2
) and the outer
diameter of
Ø
5~8mm of the photovoltaic cable as the connecting line
of the PV input terminal. Select the inner diameter of 8AWG
(8mm
2
) and the outer diameter of
Ø
16~22mm of the photovoltaic
cable as the connecting line of the AC output terminal. Cables
should avoid high temperature, flame and rain water whenever
possible. The inverter should be connected with earth
permanently. The protective earthing conductor cross-
sectional area is more than 6mm
²
.
●
Tools
The multimeter, wire stripper and screw driver are required during
