SMA America, LLC AC Voltage configuration
Installation Guide SB30-40US-IUS103030 21
4.4 Utility configuration jumpers
The Sunny Boy comes from the factory pre-configured for utility interconnection with neutral
conductor. The Sunny Boy may be reconfigured for grids without neutral by setting the jumpers on the
board of the Sunny Boy.
The utility configuration jumpers allow the Sunny Boy to be connected to transformers where the
neutral is not present, such as the 208 V and 240 V Delta. Following figure shows an overview of
default settings, settings for grids with no neutral, and fan test settings.
The Sunny Boy may be configured for two different grid types commonly found in the U.S. The Sunny
Boy is compatible with:
• 208 V AC output
• 240 V AC output
Following figure illustrates the proper jumper settings when connecting to a 240 Delta: 120 V Stinger
type transformer. Note the order in which inverters are connected to the phases.
240V/208 V AC (Default)
(With Neutral)
208 V Delta, No Neutral
240 V Delta, No Neutral
Fan Test
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