Cheap solar street lights will explode
Will explode! Will explode! explode
1) detonated. The solar VRLA battery contains more than 4% hydrogen and will detonate when there is an open flame. The main reason is that the floating charging pressure of the solar street lamp is high, and the electrolytic water is more, so that the hydrogen precipitated from the negative plate remains in the upper part of the VRLA battery, and the content gradually increases. In the float charging current is very small, even if the pole column, positive and negative plate group has a bad contact point, will not cause a flame, but in the moment to discharge, the solar street lamp battery discharge current is very large, some will reach thousands of amps, then the bad contact point is easy to produce a flame, make the street lamp VRLA battery explosion.
(2) pressure. VRLA battery with ABS plastic shell, when the internal pressure of solar street lamp battery is greater than 4OKPa, the internal stress changes greatly, the pressure explosion will occur; When the internal stress is relatively stable, even if the internal stress does not change, if the pressure continues to rise, it will cause compression explosion. The main reason is: float charging pressure on the high side, electrolysis of water is more, of oxygen precipitation positive plate and negative plate failed to fully compound and exist within the VRLA battery, the battery solar street lamps shell under increasing pressure, when the relief valve does not open automatically in time, shell when the pressure reaches a certain value, crush occurs; When the shell pressure reaches 4okPa, it is close to the dangerous state. During floating charging, due to the small charging current, the internal stress of VRLA battery is in a critical stable state and no compression explosion has occurred. However, at the moment of switching to high current discharge, the internal stress of VRLA battery changes sharply, which causes compression explosion.
To the regular manufacturer to buy.
Selection method:
First, choose regular municipal solar street lamp manufacturers, do not covet cheap solar street lamp prices. Prevent the battery from overcharging and over-discharging, prolong the life of the battery.
Second, to prevent the battery polarity reverse.
Third, prevent internal short circuit of load, controller, inverter and other equipment.
Fourth, with lightning protection caused by the breakdown of protection.
Fifth, it has the function of temperature compensation.
Advantages:
No cable laying, no AC power supply, no electricity. Adopt DC power supply and control. It has good stability, long life, high luminous efficiency, easy installation and maintenance, high safety performance, energy saving and environmental protection, economic and practical, etc.