SMA Solar Technology AG
12 SB50US-80US-IUS094030 Installation Guide
1.2 Product overview
The Sunny Boy is a DC to AC grid-tied utility interactive inverter for use with photovoltaic (PV), fuel
cell, wind turbine and other sources of DC power.
In general, the Sunny Boy takes power from a DC source (PV modules) and converts it to AC power
for the utility grid. This power is delivered first to local loads (household appliances, lights, motor
loads, etc.), with any excess power fed to the utility. The power consumed by the local loads reduces
the power needed from the utility. Excess power may actually “spin the utility meter backwards”
depending on the type of meter in your system. This power may also be recorded as power credits
by the utility company depending on the interconnection agreement. An example of basic system
components is shown in Figure below.
Sunny Boy Installed in a Utility Interactive PV System
Position Description
A PV array
B Sunny Boy with SMA DC-Disconnect
C Local loads
D Meter
EUtility Grid
Policies vary from one utility company to another. Consult with a representative of the local
utility company before designing and installing a PV system.
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