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английский) 3:
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The southern Saudi Arabia motorway tunnel miles from any power source is lit day and night on the solar-powered devices. Solar panels provide power during the day, and battery,Which accumulates enough energy to illuminate the tunnel at night-time. The energy production from the battery continues to be expensive, but the advantage BC power bulbs is,That they can bring to light areas, remote from any other power source. 
There is another advantage solar energy: not only is not limited to,But its use does not pollute the environment. That is why it is very important to develop devices that allow you to transform solar energy into mechanical or electrical forms of power.
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