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Glossary lexicon

payback period

Degree of self-sufficiency

Balcony power plant

Reference counter

Lightning protection

Federal Network Agency


Roof alignment

Roof hook


Diffuse sunlight

Direct sunlight

Thin film solar module

EEG feed-in tariff


Power socket

feed-in tariff

Energy return time

Renewable energy

Fossil energy sources

Direct current

Global radiation

Base load

Island network


Kilowatt peak (kWp)

Kilowatt hour (kWh)

Communication gateway

Power density

Tenant electricity


Mini PV

Mini solar system

Module string

Module efficiency


Monocrystalline solar module

Angle of inclination

Off grid


Photovoltaic module

Plug-in solar system

Polycrystalline solar module

Low light behavior


Solar module

Solar module for the socket

Solar power storage

Solar inverter

Solar cells

Solar energy

Electricity mix



Watt peak


Alternating current

Wieland power socket


Bidirectional counter

Photovoltaics is also called PV for short and describes the process for directly converting light energy into electrical energy. Solar cells serve as converters of forms of energy.

Silicon, which largely makes up a solar cell, is specifically mixed with drilling and phosphorus atoms. This creates two electric fields. The silicon-drilling layer is positively charged (p) and the silicon-phosphorus layer is negatively charged (n). . The transition between the two layers is the so-called positive-negative transition (pn).
As soon as sunlight hits a solar cell, an electrical voltage is generated between the connecting cables. This electrical voltage is transported to the external contacts and electrical current flows as if by magic. The higher the brightness, the faster the voltages are conducted to the external contacts and more current is produced than with lower brightness.
Alternative term: photovoltaics


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