Safety
SMA America, LLC
12
SB20_25_30HFUS-eng-IUS113711
Installation Guide
2 Safety
2.1 Appropriate usage
The Sunny Boy is a PV inverter which converts the direct current of a PV array into alternating current
and feeds this into the power distribution grid. The Sunny Boy is suitable for installation indoors and
outdoors.
You can use the generated alternating current electricity as follows:
AC and DC load circuit breaker
Secure the AC and DC cables on the Sunny Boy with load circuit breakers. With the AC and DC load
circuit breakers you can safely disconnect the Sunny Boy from the grid and the PV arrays. A DC load
circuit breaker is included in the Sunny Boy delivery. You must provide an AC load circuit breaker.
House grid:
The energy is fed into the house grid and is used there by connected
consumers (for example household devices or lights). The surplus energy is
fed into the power distribution grid. When the Sunny Boy is not generating
energy, for example at night, the connected consumers are supplied by the
power distribution grid.
The Sunny Boy does not have its own energy meter. When the energy is
supplied into the power distribution grid, the energy meter runs in reverse.
Power distribution grid: The energy is fed directly into the power distribution grid. The Sunny Boy
does not have its own energy meter. Dependent on the utility supplier, the
energy produced is compensated.
Stand-alone grid:
The Sunny Boy is connected to a stand-alone grid. A stand-alone grid is a
grid which is not connected to a power distribution grid. The Sunny Boy
requires a grid forming device, for example a Sunny Island, for operation.
The energy generated is consumed directly on site. Surplus energy can be
stored in batteries using proper equipment.
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