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5 Planning the installation
Planning the connection of the solar modules (DC)
5.5.3 Distribution of the module strings via the
MPP tracker and DC inputs
The inverter has 6 MPP trackers. Up to 18 module strings can be
connected to the inverter.
5.5.3.1 Why is this topic important?
The inverter has an integrated string monitoring function, which
is performed via current sensors. Fig. 5.16 shows the distribution
of the current sensors to the module strings of a DC input.
A
A
A
I
2
I
ges
I
1
I
3
CT 1
CT 2
CT 3
DC x
1
2
3
Fig. 5.16: Arrangement of the current sensors on the module
strings
DC connections 1 and 3 each have a current sensor (
CT1
and
CT2
). Current sensor
CT3
measures the total current of all three
module strings. The current in module string 2 is calculated by
the difference:
I
2
= I
ges
- (I
1
+I
3
)
.
This results in some points to consider when only one or two
module strings are connected to a DC input (= MPP tracker).
These special features are described in the next two sections.
Installation and Operation Manual for Solar Power Inverter M70A EU V2.0 EN 2020-08-03
