Sunny Island
Installation & Operating Instructions
BWRI33-12:EE
- 31 -
SMA Regelsysteme GmbH
If the measuring circuit of the inverter is opened during operation
this can lead to overvoltages and destruction of the current con-
verter. The measuring circuit therefore has to be short-circuited at
the current converter.
0,1
1
10
100
1
10
100
1000
Distance to current transformer [m]
Po
w
e
r
lo
s
s
[W
]
0,75
1,5
2,5
4
6
10
Current Intensity [A] :
Cable material:
Cable cross-
section[mm
2
]
5
=
Copper
Fig. 3.9: Power loss due to the secondary circuit to the inverter
3.4.6 Connection of a Generator
If e. g. a diesel generator is integrated into the island grid, not only the measurement
signals listed in chapter 3.3, but also the control signals “Diesel start“ and “Diesel
contactor“ have to be wired as shown in Fig. 3.10.
The generator is switched on with the relay “Diesel start“ (K1). When it has started
up the Sunny Island goes idle (short interruption) and connects the generator’s volt-
age to the island grid by switching the relay “Diesel contactor” (K2). Afterwards the
Sunny Island changes to grid tied operation (“RUN_I”).
