Electrical Connection SMA Solar Technology AG
22 SB33_38-IEN111851 Installation Guide
5.3 Connection to the Power Distribution Grid (AC)
5.3.1 Conditions for the AC Connection
Cable sizing
For optimum operation of the inverter, the grid impedance of the AC cable must not exceed 1 ohm.
This is necessary, amongst other things, for the correct operation of the inverter.
The conductor cross-section should be dimensioned in a way that cable losses do not exceed 1 % at
nominal power. Use "Sunny Design" (www.SMA.de/en/SunnyDesign) for this.
The maximum cable lengths 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:
• Ambient temperature,
•Routing method,
• Cable losses,
• valid installation guidelines of the respective country (of the installation location).
Cable Requirements
Connection requirements of the electric power company
Always observe the connection requirements of your electric power company.
Conductor cross-section Maximum cable length
SB 3300 SB 3800
4 mm² 18.5 m 16 m
Position Description Value
A External diameter 6 mm ... 14 mm
B Conductor cross-section 4 mm²
C Strip insulation 8 mm
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