SMA SC 500HE-US Installation - Manual (Page 56)

8 Electrical Connection SMA America, LLC
56 SC500HEUS-IA-US_en-14 Installation Manual
Sunny Central for the Connection of 9 DC Strings with Terminal Blocks (Option)
Position Description
A DC − connection (neg. grounding), DC+ connection (pos. grounding)
B DC+ connection (neg. grounding), DC − connection (pos. grounding)
C AC connection
D Ground connection