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5.5.1 Requirements for the DC Connection
Requirements for the PV modules of a string:
• PV modules of the connected strings must be of: the same type, identical alignment
and identical tilt.
• The thresholds for the input voltage and the input current of the inverter must be
adhered to (see Section 10.1 "Technical DC input data").
• On the coldest day based on statistical records, the open-circuit voltage of the PV
array must never exceed the maximum input voltage of the inverter.
• The connection cables of the PV modules must be equipped with the connectors
included in the scope of delivery.
• The positive connection cables of the PV modules must be equipped with the positive
DC connectors. The negative connection cables of the PV modules must be equipped
with the negative DC connectors.
5.5.2 Assembling the DC connectors
Danger to life due to high voltages on DC conductors
When exposed to sunlight, the PV array generates dangerous DC voltage
which is present in the DC conductors. Touching the DC conductors can lead
to lethal electric shocks.
• Cover the PV modules.
Assemble the DC connectors as described below. Be sure to observe the correct
polarity. The DC connectors are marked with the symbols "+" and " − ".
Cable requirements:
The cable must be of type PV1-F, UL-ZKLA or USE2 and comply with the following
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