One: exit protection voltage
Some customers often find that after the solar street light is on for a period of time, especially after continuous rainy days, the street light will be off for several days or even days. The battery voltage is also normal, and the controller and the lamp are all in good condition. This problem has caused many engineers to doubt, in fact, this is the "exit under voltage protection" voltage value problem, the higher the value is set, the longer the recovery time after the undervoltage, it will cause a lot of days can not be bright light. Turn off all the power at night to achieve half the output power, but the practice has proved that this method will only lead to half of the light source first light decay, inconsistent brightness or premature damage to one light source.
II: Line loss compensation
The line loss compensation function is currently difficult for conventional controllers because it requires software settings to automatically compensate for different wire diameters and lengths. Line loss compensation is actually very important in low-voltage systems because the voltage is relatively low and the line loss is relatively large. If there is no corresponding line loss voltage compensation, the output voltage may be lower than the input, which will cause the battery to advance. Undervoltage protection, the actual application rate of battery capacity has been discounted.
It is worth noting that when we use low-voltage systems, we should not use cables that are too thin in order to reduce the line-loss voltage drop. The cables should not be too long.
Three: heat dissipation
Many controllers do not consider the problem of heat dissipation in order to reduce costs. In this way, when the load current is large or the charging current is large, the controller increases the field resistance of the controller, resulting in a significant drop in charging efficiency. The service life of the field tube is too high. Greatly reduced or even burned, especially in the summer outdoor environment temperature is high, so a good heat sink should be essential to the controller.
Four: MCT charging mode
The charging mode of the conventional solar controller is copied from the three-stage charging method of the mains charger, that is, constant current, constant voltage and floating charge. Because the power of the city power grid is infinite, if constant current charging is not performed, it will directly lead to the battery charging and damage. However, the solar panel system has limited battery power. Therefore, the constant current charging method of the continuous use of the mains controller is not Scientifically, if the current generated by the panel is greater than the current limited by the first section of the controller, then the charging efficiency is reduced.
The charging method is to track the maximum current of the battery panel, without causing waste. By detecting the voltage of the battery and calculating the temperature compensation value, when the voltage of the battery is close to the peak value, pulse-type trickle charging method is adopted, which can not only make the battery full. Prevent overcharge of the battery.
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