18
19
4) Make sure the maximum output voltage of each PV string does not exceed 600V.
4.3.1.2 DC connector assembly procedure
1) Select the appropriate photovoltaic cable:
2) Peel off the DC cable insulation sleeve for 7 mm, as shown in Figure 4-9:
Figure 4-9
Wire Traverse area 2.5-4mm
2
7mm
Cable type
Traverse area (mm²)
General photovoltaic cable
Range (mm²)
Recommended value (mm²)
2.5-4.0
4.0
Figure 4-10
+
-
Crimping Plier
Open-end Wrench
Figure 4-11
Figure 4-12
3) Disassemble the connector in the accessory bag, as shown in Figure 4-10:
4) Insert the DC cable through the DC connector nut into the metal terminal and press the
terminal with a professional crimping plier (pull back the cable with some power to check if
the terminal is well connected to the cable), as shown in Figure 4-11:
5) Insert the positive and negative cables into the corresponding positive and negative
connectors, pull back the DC cable to ensure that the terminal is tightly attached in the
connector.
6) Use an open-end wrench to screw the nut to the end to ensure that the terminal is well
sealed, as shown in Figure 4-12:
1.Before assembling the DC connector, make sure that the cable polarity is
correct.
2.Use a multimeter to measure the voltage of the DC input string, verify the
polarity of the DC input cable, and ensure that each string voltage is within
600V.
Warning
Figure 4-13
7) Insert the positive and negative connectors into the inverter DC input terminals respectively, a
click sound should be heard if the terminals are well connected, as shown in Figure 4-13:
8) Seal the unused PV terminals with the terminal caps.
4.3.2 Connection of AC output
The Sunways STS 3~6kW series single phase inverter operates with grid voltage and frequency
of 220/230V and 50/60Hz, respectively.
This inverter includes an integrated residual current device (RCD) .
If an external residual current device (RCD) is used, a device of type (A/AC etc) should be used,
with a tripping current of 300mA or higher.
