SMA America, LLC Electrical connection
Installation Guide SB30-40US-IUS103030 45
6.7 DC wiring
DANGER
High voltage is present in PV modules exposed to light.
Death due to electric shock when touching a DC conductor.
• During installation, cover the PV modules with opaque material.
DANGER
High voltage is present inside the DC cables.
Death or serious injury will result when damaging a DC cable or touching a DC conductor.
• You have to connect the DC cables from the PV array to the Sunny Boy in the order
described in this manual.
NOTICE
Damage to the inverter due to overvoltage.
• Verify that the DC current of your installation does not exceed the maximum values
specified on the type rating label.
NOTICE
Irreversible damage to the inverter due to DC-input voltage that exceeds the maximum
DC‑input-voltage range.
• Verify the polarity and the open-circuit voltage from the PV strings, before connecting
the DC wires to the inverter.
• Check both the polarity and the open-circuit voltage from the PV strings.
• Configure the DC-input-voltage range correctly before connecting the DC-input wires
from the PV array to the inverter.
• Use the free design programs "Solar Design Tools" at www.SMA-America.com to
determine the correct string configuration.
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