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The Principle And Main Features Of Solar Controller
- Aug 24, 2018 -

Principle--Solar charge controller


Solar panels belong to photovoltaic devices (mainly semiconductor materials), which produce current by photoelectric effect after irradiated by light. Because of the properties and limitations of materials and light, the current generated by them is also a fluctuating curve. If the generated current is directly charged into the battery or directly supplied to the load, it is easy to cause damage to the battery and the load, seriously reducing their life. Therefore, we must first feed the current into the solar controller, use a series of dedicated chip circuits to digitally adjust it, and add multi-stage charging and discharging protection, while using our company's unique control technology, "self-adaptive three-stage charging mode (Fig. 1)", to ensure the operation of the battery and load safety and service life. When power is supplied to the load, the current of the battery is also allowed to flow into the solar controller first, after its adjustment, and then the current is sent to the load. The purpose of this method is to stabilize the discharge current, to ensure that the battery is not overdischarged, and to monitor and protect the load and battery.


If we want to use AC power equipment, we need to invert the inverter into AC before loading. 

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Main features


1. Intelligent controller is realized by using single chip microcomputer and special software.


2. Accurate discharge control using battery discharge rate characteristics. The final discharge voltage is the control point corrected by the discharge rate curve, which eliminates the inaccuracy of voltage control over discharge and accords with the inherent characteristics of the battery, that is, different discharge rates have different terminal voltages.


3. Fully automatic control with over-charging, over-discharge, electronic short circuit, overload protection, unique anti-reversal protection, etc. The above protection does not damage any parts, does not burn insurance;


4. The series PWM charging main circuit is adopted to reduce the voltage loss of the charging circuit by nearly half compared with the diode charging circuit, and the charging efficiency is 3%-6% higher than that of the non-PWM charging circuit, which increases the power consumption time. Precision temperature compensation;


5, the intuitive LED light tube indicates the current battery state, so that users can understand the usage status.


6. All the controls are industrial-grade chips (only with I-class controller), which can operate freely in cold, high temperature and humid environment. At the same time, the timing control of crystal oscillator is adopted, and timing control is precise.


7. The setting points of potentiometer adjustment and control are cancelled, and the E-square memory is used to record the working control points, so that the setting is digitized, and the factors that make the error of control points reduce accuracy and reliability due to the offset of potentiometer vibration and temperature drift are eliminated.


8. Use of digital LED display and settings, one-button operation can complete all the settings, the use of extremely convenient and intuitive role is to control the working state of the entire system, and the battery plays a role of overcharge protection, overdischarge protection. In a larger temperature range, the qualified controller should also have the function of temperature compensation. Other additional functions, such as optical switch and time control switch, should be controller options.