SMA Solar Technology AG Electrical Connection
Installation Guide SMC6-8TL-IEN101040 23
5.2 Connection to the public grid (AC)
5.2.1 Conditions for the AC Connection
Cable Sizing
The conductor cross-section should be dimensioned in a way that output losses do not exceed 1 % at
nominal power. Use "Sunny Design" (www.SMA.de/en/SunnyDesign) for this.
The maximum cable lengths relative to the conductor cross-section are shown in the following table.
The conductor cross-sectional area required in individual cases depends on the following factors
among others:
• Ambient temperature,
•Routing method,
•UV resistance.
F Connections terminals for SMA Power Balancer (page 37)
G Flat connector for grounding the cable shield when connecting the SMA Power
Balancer (page37)
H Connection terminals for mains cable (AC) (page 23)
I Cable glands for the SMA Power Balancer (page 37)
K Cable gland for grid connection (AC) (page 23)
L Cable gland for communication (page 44)
M Screwing device of shield clamp for communication cable (page 44)
N DC connectors (page 30)
O Connection socket for “Electronic Solar Switch (ESS)” DC load disconnection unit
(page 30)
P Male connector for grounding the cable shield for communication (page 44)
Q Varistors (page 69)
Connection requirements of the utility operator
Always observe the connection requirements of your utility operator!
Conductor cross-
section
Maximum cable length
SMC 6000TL SMC 7000TL SMC 8000TL
10.0 mm² 25 m 22 m 19 m
16.0 mm² 41 m 35 m 31 m
Cut line losses in half
If three inverters with symmetrical feeding are combined to form a three-phase system, the
neutral conductor is not subjected to any load, and the line losses are halved. Thus, the
maximum possible cable length is doubled.
Object Description
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