SMA Solar Technology AG
Installation Guide
SB50US-80US-IUS094030
59
9. Connect the positive and negative DC wires to the appropriate terminals in the DC disconnect
enclosure.
10. Connect the DC equipment ground wire to the PE terminal labeled
in the Sunny Boy.
11. Torque all wires in the AC and DC terminal blocks inside the Sunny Boy to:
12. Verify that all connections are correctly wired and properly torqued. Make a tension test.
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, resistive connections, and
ground faults.
The terminal must be opened completely before you insert the cable.
Grey Terminal Blocks (Weidmüller)
10 - 6 AWG: 18 in-lb (2 Nm)
Green Terminal Blocks (Phoenix)
8 - 6 AWG: 40 in-lb (4.5 Nm)
10 AWG: 22 in-lb (2.5 Nm)
