SMA SMC 5000 Installation - Manual (Page 20)

Requirements for the Installation SMA Technologie AG
Page 20 SMC50_60-11:SE2006 Installation Guide
An example for determining the rating of the AC circuit breaker is specified in detail
in chapter 10 „Sizing of a Circuit Breaker” (page 51).
The system impedance at the installation site of the Sunny Mini Central 5000/6000
must be less than 1 Ohms for the islanding detection and the fuses to work properly.
Furthermore you should have a suitable cable cross-section in order to keep the loss-
es below 1 % at nominal power. The according losses with respect to cable length
and cross-section are illustrated below:
Losses of the Sunny Mini Central 5000
The maximum cable lengths for the different cable cross-sections are as follows:
Conductor cross-
section
4.0 mm² 6.0 mm² 10.0 mm² 16.0 mm²
Max. length 12 m 18 m 31 m 49 m
Do not use cables where losses will exceed 1.0 %
Length
Lo
sse
s