Power One AURORA PVI-3.8-I-OUTD Manuel D'utilisation Et D'installation page 39

Installation and operating manual
(PVI-3.8/4.6-I-OUTD Rev.: 1.5)
It is possible to make the connection in two ways:
a) Grounding of the negative DC terminal.
b) Grounding of the positive DC terminal.
WARNING: Option b) is only available when the inputs are configured in
parallel. YOU MUST NOT use option b) if the inputs are configured
independently.
Should you not wish to connect either of the two input terminals (floating photovoltaic
generator) directly to the ground, you can disconnect the connector and store it within
the dedicated housing next to the grid standard selector switches, see Fig. 13.
NOTE: Under these conditions, neither of the input terminals is completely
floating, but each is connected to the ground with an impedance of around
1.5 Mohm.
WARNING: Depending on the grid standard chosen (see section 3.4.8), the
inverter will be able to recognize any grounding which does not respond to
the applicable regulations and an error message will appear on the display.
Fig. 14 - Connectors for grounding inputs
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