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The Disign on the Charge and Discharge Controller of PV Street-Light System

The stand-alone PV system need energy store equipment like battery when PV is impossible development like night and raining day. The stand-alone PV system has been used to lead battery and Ni-Cd battery. But a lead battery is heavy because of a low energy density and weak the durability at over charge/discharge of high current. And a using temperature band is 0～30℃ required comparison temperature unit facilities. A remains heavy metal s lead is a main bow material and continuous discharge of the sulfuration gas injurious with a power supply equipment corrosion of the circumstance at the human body activity and battery life is short. Ni-MH battery didn t use harmful material and show 1.2V～1.3V discharge. So Ni-MH battery has no memory effect, 1.5～2 times of the capacity compared with Ni-Cd and compatible with Ni-Cd battery. This paper try to present safety and reliability of the stand-alone system adapted of Ni-MH battery. And then this paper study charge/discharge characteristic and make charge/discharge controller to have temperature compensation facility using by microprocessor. So, this paper propose a tech to do upgrade system efficiency, safety and reliability of the stand-alone PV.