REFU Elektronik GmbH REFUsol 08K ... 23K 27
4.13
DC connection PV generator
DANGER
Danger to life due to high voltages from active PV strings
Before connecting the PV strings, connect the inverter to the power supply network
and to the ground bolt to ensure that the device is
safely connected to the
protective conductor.
The connection of the PV strings to the inverter or the CombinerBox can only take
place
without voltage
Live PV strings can be under lethal voltages.
The maximum allowable voltage of 25 A per DC block must be upheld. The maximum DC voltage via all
inputs must under no circumstances be exceeded.
• The DC connection is effected with Sunclix-plugs and sockets. More information seesee “DC-Connection”,
p. 28.
• 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 is defective, 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.
Protect the connectors such that they cannot be pulled off inadvertently.
The PV generator may not exceed the following operational characteristics under any circumstances!
Device type REFUsol 08K ... 23K
Max. DC voltage at each input (USC) 1000 V
Max. voltage per DC block (DC1/DC2) 25 A
Max. DC current via all DC inputs see “Technical data”, p. 61
Note:
To avoid unnecessary loss of energy yield, the sum total of the resistive and
inductive voltage drop on the power supply line at nominal load should not
exceed 1 % of the line voltage.
Note:
Do not ground the positive or negative pole of the PV generator. Otherwise,
the modules may experience a loss of power
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