SMA Solar Technology AG 11 Glossary
Operating Manual SI80H-BE-BEN120810 73
Slave
A configuration setting which assigns a subordinate role in a cluster to an off-grid or backup inverter.
Thus, this device is relieved of control and monitoring tasks, which must (or may) only be performed
by the master in a cluster. Slave devices accept the configuration settings, current firmware, and start/
stop commands from the master, and report events, warnings and error messages.
Sleep mode
Sleep mode is an energy saving mode in single-phase parallel off-grid systems. If the power of the
loads does not require the power of all off-grid inverters, the master switches off one or two slaves.
Stand-alone grid
A stand-alone grid is an electricity grid which is independent of the public energy supply. A stand-
alone grid with an off-grid inverter is designed as a single-phase or three-phase AC grid and
integrates various kinds of power generators such as PV plants and small wind turbine systems.
State of charge
Describes the current amount of charge that can be drawn from the battery, in percent of the nominal
capacity. If 25 Ah is taken from a 100 Ah battery, for example, the state of charge (SOC) is then
75%.
Wind power inverter
Device for converting the direct current from the wind energy generator to grid-compliant alternating
current.
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