REFU Elektronik GmbH
REFUsol 48K-UL
31
NOTICE
Reverse currents are fault currents that only occur in PV arrays with paralleled
strings. Given short circuits of individual modules or cells in a module, the open
circuit voltage of the string in question can drop so far that the intact parallel strings
will drive a reverse current through the defective string. This may result in
significant heating and therefore to destruction of the string.
The reverse current may cause secondary damage. Therefore, each string must be
separately protected by a string fuse. In the event of a failure, this isolates the string
from the intact strings so that destruction is prevented.
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4.13
DC and AC Terminal Connections
The terminals for DC and AC connection are suitable for use with conductors from AWG 7 1. Stranded
conductors without ferrules should only be used if AWG 2 or larger.
The provided connection housing protects the terminal block and saves the cable from mechanical stress.
Follow these steps for the connection:
1.
Drill a hole into the cabinet housing for the appropriate conduit diameter:
2.
Fix the connection housing conduit onto the housing.
3.
Put the seal element on top of the connection housing.
4.
Lift the connection housing onto the inverter housing, fitting it onto the 4 pem studs:
