SMA SB 2800i - Manual (Page 45)

Operating Instructions Glossary
SB2800i-11:FE0504 SMA Regelsysteme GmbH 43
7 Glossary
AC
Abbreviation for „ Alternating Current“
DC
Abbreviation for „ Direct Current“
Derating
Controlled reduction of power, mostly depending on temperatures of certain modules. Compared
to a complete shutdown of a device, which is a usual procedure as well, the negative impact on
the external grid is lower with derating.
MSD
The „ Mains monitoring with allocated Switching Devices“ is an obligatory safety device which
interrupts the inverter’s feeding of PV power to the grid if the external power generators have shut
down.
Stand-alone plant, island plant
Power supply system which is totally independent from external power supply.
Maximum Power Point „MPP“
The operating point (current / voltage) of the PV generator where this generates maximum power
under the current conditions. The position of the MPP changes continuously, e. g. depending on
insolation and temperature.
MPP tracker
Unit that adjusts current and voltage of the PV generator in a way so as to make the generator
operate in its maximum power point.
Grid-tied plant
PV plant connected to a public electricity grid run by an external supplier company.
PLC
Abbrevation for „ Power Line Communication“, term for data transmission via the grid cable
PV
Abbrevation for „ Photovoltaics“, term for the conversion of light energy into electrical energy.
PV plant
A system consisting of components required for the generation and utilization of solar energy. In
the case of grid-tied plants these components include the PV generator and the inverter.
PV generator