Connecting The Strings To The Connection Unit - SolarEdge SE12.5K Installation Manual

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Connecting the Strings to the Connection Unit

Secondary Grounding
If required, ground the units as described in the following figure using a grounding
cable, a grounding screw, two washers, a ring terminal and a serrated washer. You
can connect the grounding cable to either side of a unit and to either the mounting
hole or grounding screw. You can connect grounding to the Primary Unit and to each
of the Secondary Units, as required.
Connecting the Strings to the Connection Unit
You can connect systems with multiple DC strings in parallel to the DC input
terminals of the Connection Unit.
NOTE
The DC bus of each unit is separate and not shared for all units. Therefore in addition to following the
inverter design rules, each unit should follow the unit design rules as detailed in Technical
Specifications.
Inverters may have a different number of pairs of DC input terminals, depending on
the inverter power rating. If more strings are required, they can be connected in
parallel using an external combiner box before connecting to the Connection Unit;
strings connected to different units cannot be combined. When connecting multiple
strings, it is recommended to run separate circuits to the Connection Unit or to
position the combiner box near the Connection Unit.This simplifies commissioning by
allowing testing and servicing near the inverter.
To connect the strings to the Connection Unit with glands/conduits:
1. Strip 5⁄16'' (8 mm) of the DC wire insulation.
2. Insert the DC cable from the PV installation, into the DC gland on the Connection
Unit.
-Three Phase Inverter with Synergy Technology Installation MAN-01-00402-1.2
Figure 25: Secondary grounding