MPPT OR PWM CONTROLLER OF SOLAR LED STREET LIGHT
Solar street lights have controller to control the photovoltaic panel to charge the battery and provide a load control voltage for the voltage sensitive device. Now there are two types of solar controllers in the market, PMW and MPPT controllers.
The pulse width modulated PWM controller uses the digital output of the microprocessor to control the analog circuitry, a method of digitally encoding the analog signal levels. Digitally controlling analog circuits can significantly reduce system cost and power consumption. PWM controllers are included in many micro-controllers.
The MPPT controller (Maximum Power Point Tracking) is also the maximum power point tracking. It refers to the design of an intelligent calculation in the controller and the implementation of tracking devices to monitor the solar panel’s power generation voltage, and to track the highest voltage and current (VI), output the highest power, so that the system can use the highest efficiency on the battery. Charging to achieve maximum power point tracking function charging. The MPPT tracking efficiency is 99%, the overall system power generation efficiency is as high as 97%, and the battery charging phase is divided into MPPT charging, constant voltage charging and constant voltage floating charging.
We know that in order to charge the battery, the output voltage of the solar panel must be higher than the current voltage of the battery. If the voltage of the solar panel is lower than the voltage of the battery, the output current will be close to zero. Moreover, the output of the solar panel is not fixed, but varies with various conditions such as radiation intensity, ambient temperature, etc., and whether the solar panel can always work at the maximum value of the IV curve, the designer is different. Level and ability.
The traditional solar charging controller PWM has its operating parameters set. It uses the set parameters (or constant voltage, or constant current) to transfer the solar panel’s power without changing according to the surrounding environment. And the change; while the natural environment of solar irradiance, ambient temperature and humidity is changing all the time; therefore, the energy of converting solar panels in a fixed way is easy to cause the battery to be always full. State, on the other hand, when the weather is good, the solar panels cannot be fully utilized, resulting in waste.
The MPPT controller is undoubtedly a good choice. It is an electrical system that enables the solar panel to output more power by adjusting the operating state of the electrical module to efficiently store the direct current generated by the solar panel in the battery. The MPPT controller detects the solar panel’s generated voltage in real time and tracks the highest voltage and current value (VI), allowing the system to charge the battery with maximum efficiency. The tracking method is completely automatic and does not require user adjustment. When the maximum power point of the solar panel changes with environmental conditions, the controller automatically tracks the maximum power point of the solar panel to ensure that the maximum energy of the day is obtained, thereby effectively improving system efficiency and reducing system cost. The application of MPPT solar controllers in solar power systems, coordinating the work of solar panels, batteries and loads, is a very important component in solar systems. It is also very suitable for use on large solar street lights.
Although the cost of the MPPT controller is higher than the cost of the PWM controller, many solar street lamp manufacturers are not willing to use it, but it can increase the charging efficiency by 30%. The limitation of solar panel conversion efficiency, charging effect is particularly important, so we recommend solar street lights to choose MPPT controller.
|Battery parameter||Battery type||Lead acid battery/Lithium battery①||–|
|Rated system voltage||12V||Lead acid(auto identified)12/24V，lithium(need to be set)||–|
|Max. Charge current||10||15||A|
|Charge voltage range||8～15||8～30||V|
|Boost charge voltage(settable)||14.4||14.4(12V), 28.8(24V)||V|
|Float charge voltage(settable)||13.8||13.8(12V), 27.6(24V)||v|
|Battery under voltage(settable)||10.8||11(12V), 22(24V)||V|
|Clear undervoltage (settable)||12||12.5(12V), 25(24V)||V|
|Temperature compensation coefficient||-4mV/℃/2V②||–|
|PV max.input power||35||55||85||V|
|Max. PV power||130||130(12V)，260(24V)||180(12V)，360(24V)||W|
|MPPT tracking range||15≤Vmp≤35||15≤Vmp≤50(12V) 30≤Vmp≤50(24V)||15≤Vmp≤70(12V) 30≤Vmp≤70(24V)||V|
|Turn on LED PV voltage||≤5||≤5(12V), ≤10(24V)||V|
|Drive LED current||50～4000||mA|
|Drive LED voltage range||16～35||16～55V(12V)|
|Drive LED max. power||80||80(12V), 160(24V)||W|
|Drive current accuracy||≤3%FS||–|
|Dimming can be divided into time stage||5||–|
|LED dimming range||0～100||%|
|System parameter||MPPT efficiency||≥99.9%||–|
|Charge conversion max efficiency||98.4%③||–|
|Drive max efficiency||97.4%④||–|
|Communication method||Infrared wireless, 2.4G,Bluetooth communication||–|
Solar Light Magazine / Solar Street Lights / Author: Cmoonlight
What are the market prospects for solar street lights?
Solar Street Lighting Global Market Outlook - Industry Trends and Growth Forecast
IECEE and Saber Certification in Saudi Arabia
CB Certification of solar street light
Do you really know the certifications of solar street light in your country?
Top 10 Solar Street Light Manufacturers in 2021
2020 top ten manufacturers of solar street lights ？
Leave a Comment *