3.2 anti-overcharge control to prevent overcharge function, you can in the input circuit in series or in parallel with a discharge transistor, voltage identification circuit to control the transistor switch, the excess solar energy through the transistor discharge, to ensure that there is no high voltage to the battery Charge. The key is to prevent the choice of overcharge voltage, single lead acid battery is 2.2V. 3.3 anti-discharge control In addition to Ni-Cd batteries, the other batteries generally have to prevent the battery over discharge function, because it will cause the battery over discharge permanent damage. It should be noted that the solar cell system is generally relative to the battery is a small rate discharge, so the discharge cut-off voltage should not be too low. 3.4 temperature compensation temperature compensation, battery voltage control point is with the ambient temperature changes, so the solar energy system should have a temperature control of the reference voltage. For a single lead-acid battery is -3 ~ -7mV / ℃, we usually use -4mV / ℃. 4 solar light source selection Most of the current selection of LED light as a light source, LED long life, can reach more than 100,000 hours, low working voltage, very suitable for use in solar lawn light. In particular, LED technology has achieved its key breakthrough, and its characteristics in the past 5 years has greatly improved. While the performance and price ratio has also greatly improved. In addition, the LED from the low-voltage DC power supply, the light source control low cost, adjust the light and shade, frequent switching is possible, and will not have an adverse impact on LED performance. Control the color, change the distribution of light, resulting in dynamic illusion is possible, so it is particularly suitable for use in solar lawn light. There are many of its inherent characteristics, if you do not pay attention to use will cause adverse consequences. But the current LED sales in the market LED luminous efficiency can only reach 15Lm / W, can only achieve three-color primary energy efficient energy-saving lamps 1/3, three-color primary energy efficient energy-saving lamps luminous efficiency can reach 50 Lm / W ~ 60Lm / W The From the price point of view, the current production cost per Lm: three-color color efficient energy-saving lamps (including electronic ballasts) 0.022 yuan, 2002 f5mm white LED price of 1.9 to 3.0 yuan, the current production cost per Lm, the price difference Disparity. From the service life point of view, three-color color efficiency energy-saving lamps (including electronic ballasts) life can reach 6000 hours, LED can reach more than 100,000 hours, from the surface, LED life is three-color green energy efficient lamp (including electronics Ballast), but this is not the case.
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