SMA WB 5000 Installation - Manual (Page 21)

SMA Technology AG Installation requirements
Installation Guide WB50_60-11:SE4005 Page 21
The mains grid impedance at the AC input of the Sunny Boy 3800 must be less than
1 Ohm or the protective equipment may not work properly. In addition, we
recommend dimensioning the conductor cross-section so that line losses do not
exceed 1% at the nominal power. Line losses depending on the cable length and
cross-section are shown in the graph below. Multi-wire cables with copper forward
and return conductors are used.
Cable losses of the Windy Boy 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 m² 16 mm²
Max. length 12 m 18 m 31 m 49 m
0,0%
0,2%
0,4%
0,6%
0,8%
1,0%
1,2%
1,4%
0 m 10 m 15 m 20 m 25 m 30 m 35 m 40 m 45 m 50 m 5 m
4,0 mm²
6,0 mm² 10,0 mm²
16,0 mm²
Windy Boy 5000
Do not use cable losses that exceed 1.0 %
Cable length
Loss