SMA SC 250U - Manual (Page 41)

SMA America, LLC Appendix - Glossary
User Manual SCUS-BE-BUS120514 41
Maximum Power Point (MPP)
Operating point with the maximum output power. This operating point varies with the PV radiation
and temperature conditions of the modules.
NEMA
Abbreviation for National Electrical Manufactures Association
NFPA
Abbreviation for National Fire Protection Association
Patch Cable
A patch cable is used, for example, to connect a computer to a switch or router. A patch cable is an
8-wire twisted pair cable with an RJ45 plug on each end.
Power
The power is measured in W (watts), kW (kilowatts) or MW (megawatts). Power is a present value.
It displays the power the Sunny Central is currently feeding into the grid.
PV
Abbreviation for photovoltaic, designates the conversion of PV energy into electrical energy.
PV Cell
An electronic component which generates electrical energy when irradiated with sunlight. Since the
voltage produced by a PV cell is very small (approx. 0.5 V), several PV cells are combined to form a
PV module. The most common material presently used for PV cells is silicon, which is manufactured in
different forms (monocrystalline, polycrystalline, amorphous).
PV Energy System
A PV power plant is a power plant in which a portion of the PV irradiation is converted to electrical
energy by means of PV cells. The DC voltage won this way is converted to AC voltage by an inverter
(for example, Sunny Central) and is fed into the electricity network.
PV Inverter
A device for converting the direct current (DC) from the PV generator into alternating current (AC),
which is required by most normal household devices and especially for feeding energy into an
existing supply grid.
PV Module
A collection of PV cells in a housing that protects the sensitive cells from mechanical stresses and
allows easy installation.
PWM
Abbreviation for Pulse Width Modulation
Router
A router connects several computer networks together.