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MORE SOLAR POWERED DEVICES

V. Ryan © 2006 - 2009

 

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Solar powered emergency phones can be seen through the major road network in Spain. The emergency phones are distributed mainly on the motorways. The photovoltaic panels do not power the phones directly. They slowly charge up batteries allowing the phone to be used motorists unlucky enough to have cars that have broken down. Each solar panel is capable of charging a set of batteries to such an extent that the phone also be used at night.

 
   
   

This warning symbol can be seen at sharp corners. They warn drivers that they are approaching a sharp turn. This example is solar powered. Each arrow is made up of a number of LEDs. Each ‘arrow’ of LEDs flash in sequence ensuring that the driver is more likely to see the warning symbol. The LEDs even flash during the day time and are bright enough to be seen at quite a distance. The solar panel charges up a battery system that in turn powers the electronic circuit.

 
   

This parking meter is similar to ones seen in Lisbon, the capital of Portugal. They work on the same principle as the other solar powered devices shown above. Batteries power the electronic circuit and the ticket mechanism. The photovoltaic panel charges up the batteries during day light hours.

   
QUESTIONS:
1. Sketch and explain any other solar powered devices you have seen or used.
2. Design a new or existing device that can be powered by photovoltaic panels.
     
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