SMA America, LLC
Electrical Connection
Technical Description
SI5048U-TUS121440
45
6.2.4 Connecting the Sunny Island to the DC side
Requirements
• 1 conduit with a diameter of 1
1
/
2
in. (38.1 mm) is installed at the opening in the middle of the
Sunny Island (see section 6.1 ”Grounding” (page 41)).
• The conduit is attached inside the Sunny Island with a suitable nut.
Installing the DC connection
1. Pull the positive DC cable through the conduit from the distribution board into the enclosure of
the Sunny Island.
2. Pull the negative DC cable through the conduit from the distribution board into the enclosure of
the Sunny Island.
3. Remove the protective insulation from the positive and the negative DC cable.
4. Plug the negative DC lines into the "DC‒" connection block and tighten the screw to a torque of
50 in.-lbs. (5.7 Nm).
5. Plug the positive DC lines in to the "DC+" connection block and tighten the screw to a torque of
50 in.-lbs. (5.7 Nm).
WARNING
Risk of lethal electric shock.
• Connect the external fuse and the battery cable to the battery only after all
installation work has been completed.
DC Connection Area
The space between the conductor and the connection area must be clean. This way a
transition resistance and the heating of the terminals is reduced.
The Sunny Island has a MAX DC terminal rated for 2x #2/0 AWG for DC+, DC- and PE.
