This is a form of electricity that can be fed into a grid. See alternating current.
Refers to the counter that measures the amount of electricity obtained from the grid.
This is a form of electricity directly produced by modules. See direct current.
This refers to private usage of electricity that one produces with his/her own photovoltaic power plant.
A PV plant owner gets a payment at a level fixed by statute for feeding his/her power into the public power grid.
This component records the solar power fed into the public power grid. The feed-in meter reading is the reference for remuneration.
Renewable Energy Act
The priority purchase, transmission and payment of power from renewable energy sources is regulated under the Renewable Energy Act which came into force in 2000. After this law was adopted in a transformed form by 50 other countries, photovoltaics seized being a niche product and became a mass product making it competitive with the market prices of conventional energy sources.
Direct Current (DC)
With DC electricity there is only one direction flow of electrons. A DC system is only made up of a positive and negative lead.
This is the total sun radiation falling onto a horizontal surface on the ground. This is normally divided into diffuse radiation and direct solar radiation.
kWp (Kilowatt Peak)
This is the unit of the peak capacity of a PV generator under standard test conditions (STC)
kWh (kilowatt hour)
This is a physical unit for energy indicating energy and corresponding with the performance of one kilowatt during a period of one hour.
Energy utilized per unit of time.
MPP (Maximum Power Point)
This term refers to the point at which performance is at its highest.
MPPT (Maximum Power Point Tracking)
For optimum yield of module performance, the power inverter or solar charge controller must continuously adjust the voltage (V) so that the modules attain their MPP.
PR (Performance Ratio)
This is crucial for determining performance of PV power systems. The ratios of the maximum possible output and the achieved output are determined and compared.
The term used to refer to the direct conversion of light into electric energy.
This is the sum of all modules of a PV plant.
This is a single module of a solar generator which produces direct current (dc) with the help of photovoltaic effects.
Solar cylinder (storage)
In order to store excess power from own solar plant, solar cylinders can be built. At the moment, solar cylinder possibilities are lead and lithium batteries. By using a solar cylinder, the autonomy of a household can be maximized to 100% depending on size.
These are the smallest energy producing components of a PV system. They are mostly identified by their rectangular shape and shimmering black or blue color.
STC (Standard Test Conditions)
Standard Test Conditions create uniform test conditions which make it possible to carry out uniform comparisons of photovoltaic modules under laboratory conditions. These conditions are: irradiation: 1000W/m2, cell temperature: 25°C, AM (air mass): 1.5 (Europe).
The term used for a series connection of single modules under each other.
This happens when the shadow of a nearby object is cast onto a part of a solar generator. This often leads to a reduction in performance of the PV plant.
These are devices that conduct alternating current electricity into direct current electricity.
This is electric current in which the direction of flow is reversed at frequent intervals .It is usually at 230V from household sockets.
There is no 100 percent level of efficiency in technology as there is always continuous loss (friction, warmth … etc.) during conversion of energy. PV efficiency is the ratio of the power of the sunlight incident on the device to the electric power produced by a cell.