Connecting The Dc Cables To The Dc Disconnect - SMA SUNNY BOY 3000-US Installation Manual

6 Electrical Connection

6.4.4 Connecting the DC Cables to the DC Disconnect

Depending on the PV modules used in the PV plant, it is necessary to positively or negatively ground
the PV array. The PV array must be connected to the DC Disconnect, taking into account the necessary
type of grounding.
Potential damage to the inverter due to overvoltage
If the DC input voltage of the PV modules exceeds the maximum values of the inverter, the inverter
can be damaged by overvoltage.
• The maximum permissible DC input voltage of the inverter must not be exceeded.
• Check the polarity and the open-circuit voltage of the PV strings before connecting the
DC cables to the DC Disconnect.
• Configure the DC input voltage range accordingly before connecting the PV modules to the
inverter. For this purpose, use the design program "Sunny Design" for string configuration
(see PC Software>Sunny Design at www.SMA-America.com).
Figure 19: DC connecting terminal plates for connecting the PV array
Position
A
B
46 SB30-40-US-IA-en-33
Designation
"UNGROUNDED" screw terminal
"GROUNDED" screw terminal
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