SMA SUNNY ISLAND 4.4M Operating Manual page 61

SMA Solar Technology AG
7.
Damage to Sunny Island inverter due to reverse polarity or incorrect terminal lug selection
If the DC cables are swapped, high currents will flow after the load-break switch has closed and these can
damage the Sunny Island.
• Route the DC+ cable on the side of the protective cover marked with a + symbol.
• Use an Allen key (AF 5) to fasten the DC+ cable to the
DC+ connection with an M8x20 pan head screw (torque:
12 Nm). Be sure to adhere to the following screw
assembly: screw head | spring washer | fender washer |
terminal lug | DC connection.
8. Ensure that the entire contact surface of the fender washer is in
contact with the terminal lug.
9. Strip off the insulation of the DC- cable and mount a terminal lug.
10. Thread the DC- cable through the DC- cable gland into the
Sunny Island.
11. Route the DC- cable on the side of the protective cover marked with a - symbol.
12. Use an Allen key (AF 5) to fasten the DC-cable to the DC-
connection with an M8x20 pan head screw (torque: 12 Nm).
Be sure to adhere to the following screw assembly: screw head
| spring washer | fender washer | terminal lug | DC
connection.
Operating Manual
6 Electrical Connection
SI44M-80H-12-BE-en-10 61