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Fig. 39. Crimping the cable.
Insert the positive and negative cables into the corre-
e.
sponding positive and negative connectors, pull the DC
cable to make sure that the terminal is well connected to
the connector.
Use an open-end wrench to screw the nut all the way in
f.
and make sure that the terminal is sealed well, as shown
in Fig. 40:
Use the special wrenches for
MC4 connectors to ensure
that the correct tightening
torque is applied, without
damaging the connectors.
Fig. 40. Using an open-end wrench.
Before assembling the DC connector, make sure that the
cable has the correct polarity.
Warning
Use a multimeter to measure the DC input string
voltage, check the polarity of the DC input cable,
Warning
and make sure that the voltage of each string is
within the 1000 V range.
See the "Input" section in Tab. 21.
72
To ensure an optimal connec-
tion, use an approved tool to
crimp the terminals.
Connect the cables to the inverter as shown in the following
3.
connection diagrams:
Connection for installations with
a.
solar field
strings of equal length):
Fig. 41. Single solar field connection, 1 string and 1 MPPT.
Fig. 42. Single solar field connection, 2 strings and 2 MPPTs.
shows the connection layout for customers who
have purchased
inputs and only a single string is
of connection is not recommended, but it can be used
(the inverter should be replaced with a different model with
a single MPPT).
a single
(panels in the same direction and
an inverter with two MPPT
available; this type
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