Safety
SMA America, LLC
12
SB8-10TL-IUS103811
Installation Guide
2 Safety
2.1 Appropriate Usage
The Sunny Boy is a PV inverter that converts DC current from PV generator into AC current. The Sunny
Boy is suitable for mounting indoors and outdoors.
You can use the AC current generated as follows:
Unbalanced load
The Sunny Boy inverters 8000TL-US, 9000TL-US and 10000TL-US generate a power exceeding
6 kVA. To prevent a situation of unbalanced loads between phases ensure that the inverters are
installed in sets of 3, connected to L1-L2, L1-L3, and L2-L3.
AC and DC disconnectors
Separate the Sunny Boy securely from the grid and the PV generators using AC and DC
disconnectors. You must provide an AC circuit breaker. The SMA DC Disconnect is included in the
delivery of the Sunny Boy and must be used for operating the inverter.
Grounding the PV modules
The Sunny Boy 8000TL-US, 9000TL-US and 10000TL-US is a transformerless inverter. That is why it
has no galvanic separation. Do not ground the DC circuits of the PV modules connected to the Sunny
Boy. Only ground the mounting frame of the PV modules.
If you connect grounded modules to the Sunny Boy, the error message F-Riso is displayed.
During operation, the DC circuit is connected to the AC grid.
House grid:
Energy flows into the house grid. The consumers connected, for example,
household devices or lighting, consume the energy. The energy left over is
fed into the public grid. When the Sunny Boy is not generating any energy,
e.g., at night, the consumers which are connected are supplied by the public
grid.
The Sunny Boy does not have its own energy meter. When energy is fed
into the public grid, the energy meter spins backwards.
Public grid:
Energy is fed directly into the public grid. The Sunny Boy is connected to a
separate energy meter. The energy produced is compensated at a rate
depending on the electric power company.
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 public grid. The Sunny Boy needs a grid-
forming generator, for example, a Sunny Island, in order to function. The
energy generated is consumed directly on site, surplus energy can be
stored in batteries.
Policies vary from one utility company to another. Consult with a representative of the local
utility company before designing and installing a PV system.
