SMA America, LLC AC Voltage configuration
Installation Guide SB30-40US-IUS103030 19
4.3 Automatic grid voltage detection
The Sunny Boy is designed to automatically detect which grid voltage it is feeding if a neutral
conductor is connected to the inverter. Depending upon the voltage and phase angle between L1-N
and L2-N, the inverter will determine if it is connected to a 208 V or 240 V.
The following table lists voltage and frequency limits for the AC connection.
Position Description
A Sockets for optional communication Piggy-Back (RS485 or wireless)
B Display
C Status LED
D Output AC Line Terminals (N, L1 and L2)
EGround Terminal (PE)
F PV Grounding + DC Grounding electrode conductor
G Output AC Line Terminals (L1, L2, N and PE)
H PV GROUNDED Terminal (input from PV array)
I PV UNGROUNDED Terminal (input from PV array)
KCombined UNGROUNDED Terminal
L DC– Terminal (input from PV array)
M DC+ Terminal (input from PV array)
N Flat connection for grounding the cable shield for communication
O Terminal for optional communication (RS485)
AC connection Range limit
208 V nominal, line to line 183 V…229 V
240 V nominal, line to line 211 V…264 V
Frequency 59.3 Hz…60.5 Hz
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