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Passive Tracker has a sensor of thermal expansion of a material such as freon or shape memory alloys. This Tracker has a double actuator that works with each other by receiving the light directly. When one of the actuators receives brighter light, the solar panel movement will follow the actuator. Thus the movement of the double actuators depends on the amount of light received one of the actuators. Testing against these tracker has a cheaper cost, but not acceptable to the wider consumer
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