The corrosion resistance operation of solar power generation controllers mainly includes the following aspects:
1、 Installation environment selection
Avoid corrosion sources: Solar power controllers should be installed as far away as possible from corrosive gases (such as sulfur dioxide, hydrogen sulfide, and other chemical waste gases) and corrosive liquids (such as seawater, chemical solutions, etc.). For example, in a solar power generation system by the seaside, it is necessary to ensure that the controller is installed in an indoor environment at a certain distance from the coastline to prevent the erosion of the controller by seawater droplets carried by sea winds.
Control humidity environment: Humidity is an important factor affecting corrosion. High humidity environments can easily cause metal parts to rust and electronic components to be damaged by moisture. Therefore, it is best to control the relative humidity of the installation site within a certain range, generally recommended to maintain it at 40% -60%. Humidity control can be achieved by installing dehumidification equipment or installing the controller in a well ventilated and dry location.
2、 Shell protection measures
Choosing the appropriate shell material: The shell is the first line of defense against corrosion for solar power controllers. High quality shell materials can effectively prevent corrosion. Usually, corrosion-resistant metal materials (such as aluminum alloy, with surface treatment) or high-strength engineering plastics are used. For example, using ABS plastic casing with good weather resistance and chemical stability, this material can resist the erosion of natural factors such as ultraviolet radiation and acid rain.
Shell sealing design: Ensure that the controller shell has good sealing to prevent corrosive substances from entering the interior. The interface of the shell (such as wiring terminals, ventilation openings, etc.) should be sealed with sealing rubber rings or gaskets. After the wiring operation, check the sealing condition of the wiring port to ensure that there are no gaps for moisture or corrosive gases to enter.
3、 Internal component protection
Circuit board protective coating: Apply a layer of protective paint (such as three proof paint) on the surface of the controller’s circuit board, which can effectively isolate the circuit board from the external environment, prevent moisture and corrosive gases in the air from contacting the components and circuits on the circuit board. Protective paint has good insulation, moisture resistance, and chemical stability.
Component selection considers corrosion resistance: When selecting electronic components (such as capacitors, resistors, chips, etc.) inside the controller, priority should be given to components with good corrosion resistance. For example, selecting a sealed electrolytic capacitor can effectively prevent electrolyte leakage and external corrosion through its casing. For some key metal connection components, surface treatment processes such as gold plating and nickel plating can be used to improve their corrosion resistance.
4、 Regular maintenance and inspection
Appearance inspection: Regularly (such as once a month) inspect the appearance of the solar power controller to see if there are signs of corrosion (such as rust, discoloration, deformation, etc.) on the outer shell, and if the sealing gasket is aging or damaged. If slight corrosion is found on the outer shell, it can be cleaned and coated with protective paint for repair in a timely manner.
Internal inspection (cautious operation): Under the guidance of professional personnel, conduct internal inspections of the controller at regular intervals (such as six months or one year). Check whether the components on the circuit board are corroded and whether the solder joints are secure. If corrosion damage is found on the components, they should be replaced in a timely manner. During the inspection process, attention should be paid to avoiding damage to electronic components caused by static electricity, and operators need to wear anti-static wristbands.