SMA America, LLC Electrical Connection
Installation Guide SB50US-80US-eng-IUS112633 55
10. Tighten all cables in the AC and DC terminal blocks in the SMA DC Disconnect:
11. Check whether all connections are correctly wired. Carry out a tensile test to see whether all
cables are tight.
6. Pull the DC cables from the SMA DC Disconnect
inside the Sunny Boy.
7. Pull the cable back slightly so as to seal the sealing
grommet.
8. Connect the white cable (PV GROUNDED) to the
terminal labeled DC+ in the Sunny Boy.
9. Connect the black cable (PV UNGROUNDED) to
the terminal labeled DC − in the Sunny Boy.
Gray terminal blocks (Weidmüller) 10 … 6 AWG: 18 in-lbs. (2 Nm)
Green terminal blocks (Phoenix) 8 … 6 AWG: 40 in-lbs. (4.5 Nm)
10 AWG: 2 in-lbs. (2.5 Nm)
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