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In solar power plants many photocells are placed together, in order to produce electricity.
A small solar power plant can produce 20-100KW of electricity.

Photovoltaic panels can also be installed on the roofs of buildings. In this case the produced power is much lower and ranges from 2 to 20 KW.

The panels in solar power plants could be installed in two different ways.
1. Fixed solar power plants where the panels are firmly seated and facing toward the south. 
2. Moving solar power plants in which the panels are mounted on trackers and move to follow the sun during the whole day.

The electronic circuit controls two motors: one for horizontal movement (east - west) and one for vertical (down-up down in the morning and afternoon - up at noon).
Software controls the motors. The software calculates the position of the sun according to the seaso e.g. exact rising and sunset position, the height sun will reach and adjusts the movement.
In movable solar parks Anemometers also exist. Ιf the wind exceeds a certain speed the panels are turned in a horizontal position to be protected.
The panels are connected in series to the inverter (can be seen with red in the pictures) which converts direct current produced by the photocells to alternating one and sends it to the PPC facilities.

The park appears on the video and photos is in Edessa- Greece and produces approximately 100KW.
Each tracker produces approximately 7,5 KW power.
It is estimated that rotating panels have a 30-40% higher performance than the fixed ones.
On the other hand due to the moving parts, they cost more than the fixed ones.

© 2003, Despina M. Garyfallidou Athens-Greece