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With the strong advocacy of the government and the vigorous promotion of new rural construction, rural solar street lights are becoming increasingly recognized. Nowadays, it is common to find tens of thousands of rural solar street lights in a county. So, what are the main protection methods for rural solar street lights? Here is an introduction by the Century Sunshine Lighting editor.
Main protection methods for rural solar street lights:
1. Direct charge protection voltage: Direct charging, also known as fast charging, uses a high current and relatively high voltage battery to charge the lithium battery when its voltage is low. There is a control point, also known as the protection point, which protects the voltage directly through the charge. During the charging process, the voltage at the lithium battery terminal must not exceed this protection point; otherwise, it may cause overcharging, which is harmful to the lithium battery.
2. Floating charge control voltage: Usually, after the equalization ends, the lithium battery can also be allowed to sit for a period to naturally reduce its voltage. When it reaches a level that maintains voltage, it enters the floating state, similar to low current charging. The battery voltage decreases, refilling it at the low point, then connecting in series to prevent continuous temperature rise, which is very beneficial for lithium batteries.
3. Uniform charge control voltage: After direct charging, the lithium battery is usually placed by the charge-discharge controller for a period to allow its voltage to naturally decline. When it drops to the “recovery voltage” value, it enters a uniform charge state, also known as “balance charging.” The charging time should not be too long, generally from a few minutes to ten minutes, as setting the time too long can harm the battery.
4. Termination voltage above the protection point: The discharge of lithium batteries should not fall below national standards. Although lithium battery manufacturers have their own protection parameters, they must ultimately comply with national standards. For safety reasons, the over-protection point for a 12V lithium battery usually adds 0.3V for temperature compensation or correction of control circuit errors, making the protection point voltage for a 12V battery 11.10V, while for a 24V system, the protection point voltage is 22.20V.
The above discusses the main protection methods for rural solar street lights. More and more new rural areas are choosing to use rural solar street lights because, overall, they are more economical, safe, and reliable. They have many advantages and will become even more widespread in the future.
