Installation Instructions

SMA Solar Technology AG Electrical Connection
Installation Guide SB11_12_17-IEN100132 17
5.2 Connecting the Sunny Boy to the public grid (AC)
Cable Design
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-section required in individual cases depends on the following factors:
• ambient temperature,
•routing method,
•UV resistance,
• line losses,
• valid installation guidelines of the respective country (of the installation site).
Cable Requirements
Connection requirements of the grid operator
Comply with the connection requirements of your utility operator.
Conductor cross-section Maximum cable length
SB 1100 SB 1200 SB 1700
1.5 mm² 21 m 18 m 15 m
2.5 mm² 35 m 30 m 22.5 m
Position Designation Value
A External diameter 9 ...17 mm
B Conductor cross-section max. 2.5 mm²
C Strip insulation 4 ... 5 mm