SMA Solar Technology AG Electrical Connection
Installation Guide SB20_25_30HF-IEN102911 39
6.2 Connection to the Public Grid (AC)
6.2.1 Conditions for the AC Connection
Cable Sizing
The grid impedance of the AC cable must not exceed 1 Ω .
The conductor cross-section should be dimensioned such that cable 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.
Do not exceed the maximum cable length.
The conductor cross-sectional area required in individual cases depends on the following factors
among others:
• Ambient temperature,
• Routing method,
•Conduction losses,
• valid installation requirements of the respective country (installation location).
Cable requirements
Connection requirements of the utility operator
Always observe the connection requirements of your utility operator.
Conductor
cross-section
Max. cable length
SB 2000HF-30 SB 2500HF-30 SB 3000HF-30
2.5 mm² 18 m 14.5 m 12 m
4.0 mm² 29 m 23 m 19 m
Position Description Value
A External diameter 6 mm … 14 mm
B Conductor cross-section 2.5 mm² … 4 mm²
C Strip insulation 8 mm
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