Sma SUNNY BOY User Manual download pdf (Page 42)

Glossary SMA Solar Technology AG

42 SB_SMC-BEN092840 User Manual

7 Glossary

Abbreviation for "Alternating Current"

Abbreviation for "Direct Current"

Derating

A controlled reduction in performance, usually dependent on component temperatures. Compared

with the (also common) practice of completely shutting down the device, derating has a less drastic

effect on the external grid.

Grid-connected system

PV system which is connected to the power supply grid of an external energy supplier.

Grid impedance

The grid impedance is a characteristic grid specification, which is determined both by the grid

infrastructure, and by the number of power suppliers and power consumers. If supply to the grid

section drops due to a grid shutdown on the part of the adjacent energy suppliers (medium-voltage

transformers), the grid impedance changes abruptly. In order to detect this occurrence, and to prevent

the formation of an unwanted stand-alone grid, SMA Grid Guard monitors the grid impedance and

disconnects the inverter from the grid in the event of a sudden impedance variation.

Inverter

A device for converting the direct current (DC) from the PV generator into alternating current (AC),

which is used by most normal household devices, and especially for feeding energy into an existing

supply grid.

Maximum Power Point "MPP"

The operating point (current / voltage) of the PV generator at which the highest possible performance

under the prevailing conditions is achieved. The actual MPP changes constantly, depending on the

level of solar irradiation, cell temperature, etc.

MPP tracker

A device that adjusts the voltage and current of a PV generator so that it operates at its

"Maximum Power Point".

Abbreviation for "photovoltaic" describing the conversion of solar energy into electrical energy.

PV generator

Technical device for the conversion of solar energy into electrical energy. This normally refers to all

installed and electrically connected solar modules in a PV system.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 48

No comments

Sma SUNNY BOY User Manual Page 42