Installation | DC Connection of the Solar Generator
28 | Doc. No. 982056, Version 01, SelectSun 40K
The inverter has a single DC input for connecting the solar generator. The module strings must be combined
in a separate DC string combiner box.
The DC terminals can be used with aluminum and copper wires. Please also check the installation instruction
of Phoenix Contact.
Fig. 11: DC connection Phoenix Contact TW50
•
Before connecting the PV strings an isolation measurement must be taken.
•
Whenever it is switched on, the inverter automatically checks the insulation of the PV generator. If the
isolation resistance measurement is outside of the acceptable threshold, the inverter switches off
automatically. The inverter can only be started once the PV generator isolation error has been removed.
•
Be absolutely sure to verify proper polarity when connecting the PV strings. Any inappropriate connection
of individual strings may damage the PV generator.
•
The inverter is protected by an integrated polarity reversal protection diode.
•
Install a strain relief for the DC connections.
The PV generator may not exceed the following operational characteristics under any circumstances!
Device type
40K
Max. DC voltage at each input
1000 V
Max. short-circuit current DC input
160 A
Max. DC operating current
84 A