SMA Solar Technology AG
Electrical Connection
Installation Guide
SB11_17-IEN084820
19
5.3 Connecting the Public Grid (AC)
Cable Design
The cable cross section should be sized using the "Sunny Design" design program (www.SMA.de) so
that line losses do not exceed 1 % at nominal power.
The Sunny Boy 1100 and 1700 must be connected with a cable cross section of at least 1.5 mm².
The cable cross-section required in an individual case depends on factors such as ambient
temperature, type of cable installation, and line losses and must be selected according to the valid
installation guidelines of the respective country (of the installation location).
The maximum cable lengths related to the cable cross section are presented in the following table.
Cable Requirements
Connection requirements of the grid operator
Always observe the connection requirements of your grid operator!
Cable cross section
Maximum cable length
SB 1100
SB 1700
1.5 mm²
21 m
15 m
2.5 mm²
35 m
22.5 m
o
max. 2,5 mm²
9 ... 17 mm
External diameter
Wire cross section