Industry News

As the control component of the solar street light (solar garden light), the solar controller plays an irreplaceable role in the solar street light system. It is like a human brain or a computer processor. Although it is small, it plays a core role. Therefore, it is particularly important to choose a good quality controller. Here is a brief introduction to the points that need to be paid attention to when choosing a controller:
 
 
 
One: Exit protection voltage
 
 
 
   Some users find that after working for a period of time, especially after a few consecutive rainy days, the solar street lamp will not turn on for several days or even many days, the battery voltage is normal, and the controller and light source are normal. This problem has puzzled many maintenance personnel. In fact, this is a problem of the voltage value of “exit under-voltage protection”. The higher the value is set, the longer the recovery time after under-voltage is, and it will not be normal for many days. jobs.
 
  A high-quality controller should allow each customer to set the voltage value of the exit protection according to the configuration. However, it is worth noting that the configuration of the battery panels must be reasonable. If the daily charging capacity of the battery panels cannot meet the discharge capacity of the night, in the long run, the battery will often be deeply discharged and the life span will be greatly shortened, so the battery panel configuration must be enlarged. , The larger the configuration of the battery panel, the lower the exit protection voltage can be set, so that it will not cause the impact on the battery.
 
 
 
2: Constant current output
 
 
 
   Due to its own characteristics, the LED light source must be constant current or current limited, either in normal use or affecting its life. Common LED lights are achieved by adding a driving power supply to achieve constant current to the LED lights, but this driving consumes a lot of power consumption. Therefore, people think of ways to integrate the constant current into the controller, so that not only the installation is simple, but the power consumption is also smaller.
 
 
 
Three: output period
 
 
 
   Ordinary controllers can only be set to turn off the lights for 4 hours or 8 hours after turning on the lights, which cannot meet the needs of many customers. A high-quality controller should be able to set the time period freely, the time of each time period can be set arbitrarily, the on and off settings of multiple modes, and better, it can be set independently.
 
 
 
Four: LED light output power adjustment
 
 
 
    Among solar-powered lamps, LED lamps are the most suitable for achieving different output power through pulse width adjustment. While limiting the pulse width or limiting the current, the duty cycle of the entire output of the LED lamp is adjusted. For example, a single 1W LED 6 series and 5 LED lamps totaling 30W can be discharged at night, and the late night and early morning periods can be separately performed Power adjustment, such as adjusting to 15W in the middle of the night and 24W in the early morning, and locking the current, so as to meet the lighting all night, and save the cost of battery board and battery configuration. Long-term experiments have proved that the pulse width adjustment method of LED lamps generates much less heat in the whole lamp, which can extend the life of the LED.
 
 
 
Five: heat dissipation
 
 
 
   In order to reduce costs, many controllers do not consider the heat dissipation problem. When the load current is large or the charging current is large, the heat increases, and the internal resistance of the field tube of the controller is increased, resulting in a significant decrease in charging efficiency and the service life of the field tube after overheating. Greatly reduce or even burn out, especially the outdoor environment temperature in summer is very high, so a good heat dissipation device should be indispensable for the controller. The iron or plastic case cannot meet the heat dissipation requirements in summer, so the aluminum case is the control The material of choice for the hardware of the device.
 
 
 
Six: MCT charging mode
 
 
 
   The charging mode of the conventional solar controller is to copy the three-stage charging method of the mains charger, namely the three stages of constant current, constant voltage and floating charge. Because the energy of the mains power grid is infinite, if the constant current charging is not carried out, it will directly cause the battery to burst and be damaged. However, the solar street lamp system has limited battery power, so it is not necessary to continue to use the constant current charging method of the mains controller Scientifically, if the current generated by the battery panel is greater than the current limited by the first stage of the controller, then the charging efficiency will decrease. The MCT charging method is to track the maximum current of the battery board without causing waste. By detecting the battery voltage and calculating the temperature compensation value, when the battery voltage is close to the peak value, the pulse-type trickle charging method is adopted, which can not only make the battery full It also prevents overcharging of the battery.
 
 
 
Seven: Waterproof and moisture-proof performance
 
 
 
   Coastal users can best realize that a non-waterproof controller may corrode the circuit board in about half a year. In order to facilitate maintenance, most customers put the controller on the base of the light pole. However, many light pole manufacturers have poor airtightness of the base. When it rains, rain water will enter, so the controller that is not completely waterproof is very useful. It may be corroded by water ingress. When the amount of rainwater enters, it will cause a short circuit of the controller circuit instantly. Another thing to note is that the terminal should be wrapped with waterproof tape, because ordinary insulating tape cannot protect the wiring from water.
 
 
 
Eight: temperature compensation function
 
 
 
   This is a problem that is easily overlooked, but it is very important and indispensable. The unique negative temperature characteristic of the battery, the voltage of the battery becomes higher when the temperature is low, and the voltage of the battery becomes lower when the temperature is high. The controller monitors the voltage of the battery in real time while charging. Generally, a 12V battery detects around 14.5V for protection to prevent overcharge from damaging the battery. If there is no controller with temperature compensation function, and in high and low temperature environments, the voltage detected by the controller in real time for the battery will have a large error, which will directly lead to serious consequences such as dissatisfaction in low temperature environments and overcharge in high temperature environments.

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