Sunny Boy 700
Technical Description
SB700-11:EE
-
23
-
SMA Regelsysteme GmbH
3.3.1 Connection to the Electricity Grid
The Sunny Boy must be connected to the grid with three cables - one phase, one
neutral and one protective earth (PE).
We recommend a 16 A automatic circuit breaker. No consumers are
allowed on this circuit or they have to be fused separately.
The grid impedance value at the connection point must be lower than 1.0
Ω
in any
case in order to fulfill the necessary conditions for the MSD (see chapter “Mains
monitoring with allocated switching devices”).
The impedance is the sum of the electricity grid impedance at house dis-
tribution and all impedance values of cables and clamping points.
NB: Impedance values are
- ca. 0.48
Ω
for a 20 m cable with a cross section of 1.5 mm²
- ca. 0.50
Ω
for a 35 m cable with a cross section of 2.5 mm²
The AC connector socket for utility connection can take a cross section of
up to 2.5 mm².
Make sure the grid is disconnected in the fusebox before you con-
nect the AC connection socket.
The AC connector is a round socket that is suitable to take different cable diameters.
A PG13.5 and a PG16 cable seal are included with the AC connection socket. Check
which size is suitable for your AC connection cable.
Strip the insulation off the ends of the cable and connect the cable to the AC socket
as shown in Fig. 3.4 “AC connection socket”.