Sonnen sonnenBatterie eco 8.0, Installation Instructions Manual, Page: 29 / 63

Electrical connection 6
The following points must be observed when connecting the power meters:
Figure 21:
Power meter components
1 A1 – input for generation
2 A2 – input for consumption
3 Voltage measurement terminal strip
4 Power meter
5 Transformer interface for
consumption
6 Clamp-on current transformer for
consumption – L1
7 Clamp-on current transformer for
consumption – L2
8 Clamp-on current transformer for
consumption – L3
9 Clamp-on current transformer for
generation – L1
10 Clamp-on current transformer for
generation – L2
11 Clamp-on current transformer for
generation – L3
12 Transformer interface for generation
13 Modbus terminal strip
A1 A2
N L1 L2 L3
K
L
K
L
K
L
K
L
K
L
1 2 3
KSW
K
L
1 2 3
KSW
1
3
4
5
6
7
8
13
12
11
9
10
2
power meter
WM 271
Strommessung
Erzeugung Verbrauch
Current Measurement
Generation Consumption
Voltage Metering
Spannungsmessung
•
Never confuse inputs A1 and A2.
•
The lines connected to the voltage
measurement terminal strip (3) must
be protected by the supplied
miniature circuit breakers (B6). The
supplied miniature circuit breakers do
not have to be installed if the lines are
already protected by existing circuit
breakers.
Figure 22:
Correct (left) and incorrect (right)
energy flow direction
K
L
K
L
•
The clamp-on current transformers
are clamped across the affected lines.
The energy flow direction of the
clamp-on current transformer must
be observed.
The energy flow in the line must run
from K to L.
Figure 23:
Connecting the clamp-on current
transformers for three-phase (left) and
one-phase generators (right)
1 Clamp-on current transformer for
generation L1
2 Clamp-on current transformer for
generation L2
3 Clamp-on current transformer for
generation L3
4 Transformer interface for generation
5 PV inverter or generator
L1 L2 L3 N PE
K
L
K
L
K
L
1 2 3
KSW
L1 N PE
K
L
K
L
K
L
1 2 3
KSW
1
2
3
4
5
1
2
3
4
5
•
In the case of a one-phase PV inverter or a single-phase mains, only the clamp-
on current transformer for the phase in question is connected. The other two
clamp-on current transformers must not be connected.
KD-291 | Part no. 52187 | EN | X01 page 29 of 63
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