SMA SB 3800-U - Manual (Page 38)

5-10 SMA America SB3800U-12:SE2006
Use the following procedure to connect the DC wires to the Sunny Boy 3800U:
1. Verify that the AC breaker is OFF.
2. Verify that the DC disconnect is OFF.
3. Install a 3/4 -inch conduit fitting in the SB3800U’s DC wiring knockout. (See Figure
5-1and Figure 5-6). Fasten the conduit fitting on the inside of the SB3800U with
the appropriate locknut.
4. Install
3/4
-inch conduit between the DC disconnect enclosure and the SB3800U’s
DC wiring knockout.
Note: Refer to Figure 5-6 for steps 5 through 7.
Figure 5-6 DC Connection Terminals
Check both the polarity
and the open-circuit
voltage from the PV strings!
Positive DC wire con-
nected to DC+ terminal
Negative DC wire
connected to DC- ter-
minal