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6 Electrical Connection
SMA Solar Technology AG
Operating manualSTP3-6-3AV-40-BE-en-1222
6 Electrical Connection
6.1 Overview of the Connection Area
RS485
A
B
+
+
AC
F
A
C
B ED
G
Figure 6: Connection areas at the bottom of the inverter
Position Designation
A One positive and one negative DC connector, input A
B One positive and one negative DC connector, input B
C Jack with protective cap for RS485 communication connection
D Network port with protective cap
E Jack with protective cap for the WLAN antenna
F Jack for the AC connection
G Connection point for an additional grounding
6.2 AC Connection
6.2.1 Requirements for the AC Connection
Cable requirements:
External diameter: 8mm to 21mm
Conductor cross-section: 1.5mm² to 6mm²
Insulation stripping length: 12mm
Sheath stripping length: 50mm
The cable must be dimensioned in accordance with the local and national directives for the
dimensioning of cables. The requirements for the minimum wire size derive from these
directives. Examples of factors influencing cable dimensioning are: nominal AC current, type of
cable, routing method, cable bundling, ambient temperature and maximum desired line losses
(for calculation of line losses, see the design software "SunnyDesign" from software
version2.0 at www.SMA-Solar.com).
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