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5. Pull the DC wires from the DC disconnect through the conduit into the interior of the
SB3800U.
6. Connect the positive DC wire to the terminal labeled DC+ in the SB3800U.
7. Connect the negative DC wire to the terminal labeled DC– in the SB3800U.
8. Connect the positive and negative DC wires to the appropriate terminals in the DC
disconnect enclosure.
9. Connect the DC equipment ground wire to the terminal labeled PE in the SB3800U.
10. Torque all AC and DC wires in the SB3800U to 18 in-lb.
11. Verify that all connections are correctly wired and properly torqued.
SB3800U-12:SE2006
Note: The SB3800U has provisions for up to two PV strings.
The positive and negative terminal blocks each have two
positions, so two pairs of DC-input wires can be connected
in parallel.
CAUTION: Avoid using wire nuts to join any wires together
or to make any connections anywhere in the PV system.
Wire nuts are a frequent cause of unreliable connections,
resistive connections, and ground faults.
SMA America
5-11
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