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To determine how many strings can be connected to the SMI:
Verify that the cumulative short circuit current (I
sc
) of all parallel-connected strings is
below:
The rated maximum input current of the inverter
The rated maximum input current of the SMI
To connect DC strings to the SMI:
1. Open the lower compartment of the SMI as described in
Figure 14: Connection area
2. Use an Allen key to loosen the 5/16” screws of the SMI DC power distribution blocks.
3. Remove the seal from the glands labeled DC+ IN/DC- IN.
Figure 15: SMI - bottom view
4. If the cables from the combiner box are 18-25 mm in diameter, insert the wires
through the opening.
If the cables are less than 18 mm in diameter, replace the rubber seals in the gland
with the rubber seals supplied in the SMI package, and insert the wires through the
opening.
Chapter 2: Installing the SMI
16
SMI-180 Installation Guide MAN-01-00157-1.1