User Manual
33
AC combiner box should meet the above requirements. The “3+1” solution
shown below is recommended. The max. continuous work voltage of M1,
M2, M3 and M4 is 440VAC;
The withstanding voltage of the low-voltage winding side of the
transformer, the AC cables and the secondary devices (including the relay
protection, detection & measuring, and other related auxiliary devices) to
the ground should not be lower than 850V.
L1
L2
L3
M1
M2
M3
M4
If AC side has no anti-PID function or other special requirements, please
ground the grid neutral point or the AC output terminals “N” and “PE” may
be connected.
AC Cable Requirements
Consider the following facts when select AC cables specifications and types:
The grid impedance of the AC cable must correspond to the specification to
avoid unintended disconnection from the grid or derating of the output power.
360
380
400
420
440
460
480
0
0.5
1
2.5
500
2
1.5
2.26
Max
. allowable g
rid
impedance
[Ohm
]
AC voltage without load[V]
Voltage drop and other consideration may use the larger size cables. Avoid
power loss in cables of more than 1% of nominal inverter rating.
