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If grounding of the DC wires is required, refer to the following figure that demonstrates
proper and improper grounding locations (marked
a
and ×).
NOTE
When connecting the SMI to a grounded array, the grounding must not be
between the SMI and the power optimizers. All grounding should be at the
inverter or between the SMI output and the inverter. The SMI allows both
positive and negative grounding.
Figure 18: Example - Grounding locations
Connecting to a DC Power Supply
The SMI is powered from a separate DC power supply unit (PSU, not provided by
SolarEdge). Use a PSU with 48V nominal voltage. The input of the SMI can be connected
to voltages 30-55 VDC, and each SMI will consume 12W.
CAUTION!
The PSU must be limited or fused to 50A .
Up to 10 SMIs can connect to a single PSU.
Refer to the following table for selecting the PSU wiring and the DC wiring, depending
on the number of SMIs connected to the same PSU:
Chapter 2: Installing the SMI
18
SMI-180 Installation Guide MAN-01-00157-1.1