The solar street lamp battery is an application of the battery in the solar street lamp. The solar street lamp battery functions to store the electric energy generated by the solar battery component, and another new energy street lamp when the illumination is insufficient or the night lighting. This article mainly explains the solar street light storage battery. First, it introduces the solar street lamp storage battery configuration calculation method and the commonly used batteries for solar street lamps. Secondly, it reviews the inspection and maintenance of Yangon street lamp storage batteries. Finally, it introduces six techniques for prolonging the life of solar street lamps.

One: First calculate the current:

Such as: 12V battery system;

There are only 30W lamps, totaling 60 watts.

Current = 60W ÷ 12V = 5A

II: Calculate the battery capacity requirement

Such as: the cumulative lighting time of the street lamp needs to be 7 hours full load (h);

(Opens at 8:00 pm, closes at 1:30 pm, opens at 4:30 in the morning and closes at 5:30 in the morning)

Need to meet the lighting needs of continuous rainy days for 5 days. (5 days plus lighting one night before rainy days, totaling 6 days)

Battery = 5A × 7h × (5 + 1) days = 5A × 42h = 210AH

In addition, in order to prevent the battery from overcharging and overdischarging, the battery is generally charged to about 90%; the remaining 20% ​​of the discharge.

So 210AH is only about 70% of the true standard in the application.

1, lead-acid batteries: low prices, suitable for low-temperature high-rate discharge; sealed maintenance-free; but need to pay attention to prevent lead-acid pollution, and too heavy, will be phased out.

2, nickel-cadmium storage battery: strong, cheap, economical and durable, low temperature performance; but need to pay attention to prevent the cadmium metal pollution to the environment.

3, nickel-metal hydride batteries: high rate charge and discharge performance, no pollution, green batteries; small systems used, it is worth vigorously promoted.

4, lithium iron phosphate battery: high temperature performance, large capacity, high charge and discharge efficiency, light weight, pollution-free environmental protection; but its price is expensive, the charger is also selective.

How long is the life of a solar street light?

Everyone is saying that solar street lamps have the ability to resist wind, high brightness, easy installation, stable and reliable operation, and no consumption of conventional energy sources. These are the important developments in the 21st century for the development of lighting and provide more for our nightlife. The convenience. However, solar street lights have many advantages. We also need to consider the service life of solar street lamps. How long it can take is more important. After all, the price of solar street lights is not a small amount.

Want to know the life of solar street lights, we must first understand the components of solar LED street lights, it is composed of solar panels, solar controllers, battery packs, light sources, light poles and lamp housings, as long as the configuration of a reasonable solar street lamp manufacturers Do not cut corners, these components in the battery life is about 5 years after the performance will be reduced, LED light source life of 50,000 hours or so, about 5 years time, and the solar panel life of 20 years, * is not easy to damage, Solar controllers that experience lightning strikes may be damaged.

Therefore, the service life of solar street lamps can still meet the requirements of a wide range of local use. Solar street lamps use solar energy as the power supply to provide nighttime street lighting. As long as there is sufficient sunlight, they can be turned on.

Second, how long is the use of solar street lights?

Because solar street lights do not pollute the environment, they are also known as green products. I believe we all know that solar street lights use solar energy as a power supply to provide night road lighting. As long as there is sufficient sunlight, they can be turned on, but customers are Before buying a solar street light, the lifetime of solar street lights will be considered. How long can it be used?

To know the useful life of solar street lights, we must first understand the components of solar street lights. It consists of solar panels, solar controllers, battery packs, light sources, lamp posts, and lamp housings. As long as the solar street lamps are properly configured, manufacturers cannot If you cut corners, the performance of the battery life of these components will decline after about 5 years. The lifespan of the LED light source will be 50,000 hours or so, about 5 years, and the solar panel life will be 20 years. * It is not easily damaged. The controller may experience damage due to a lightning strike.

Therefore, the use of solar street lamps can still meet the requirements of the majority of local use, with wind resistance, high brightness, easy installation, stable and reliable, does not consume conventional energy and other advantages.

1. Observe whether the surface of the battery is clean and there is no leakage of corrosion. If the shell has more dirt, wipe it with a damp cloth and wash it with detergent.

2. Observe whether the appearance of the battery is concave or bulging;

3. The tightening work of connecting screws between the battery cells should be performed at least once every six months to prevent loosening and poor contact and other failures. In the maintenance or replacement of the battery, the tools used (such as wrenches, etc.) must be insulated to prevent short circuits.

4, the battery should be charged after discharge. If the battery is not fully charged due to continuous rainy days, the power supply time of the power station should be stopped or shortened to avoid overdischarge of the battery. Power station maintenance personnel should perform regular and balanced charging on the battery, which is usually performed 2 or 3 times per quarter. For a long-term decommissioned battery (more than 3 months), it should be recharged and put into operation.

5, in the winter to do a good job of battery room insulation work, in the summer to do a good job of ventilation of the battery room, battery room temperature should be controlled as much as possible between 5 °C ~ 25 °C.

6. Keep the solar panel array lighting surface clean. In areas with little rain and heavy sandstorms, it should be cleaned once a month. Rinse with clean water first. Then wipe the water traces with a clean, soft cloth. Do not wash with a corrosive solvent or wipe with a hard object. . The cleaning should be done in the absence of sunlight or sooner or later. It should be avoided that during the daytime, when the PV Module is exposed to the sun's heat, the module is washed with cold water. The very cold water will break the glass panel of the PV module.

7. Regularly check whether the connection between PV module boards is firm, and whether the wiring in the connection box of the module is firm and tighten as required; check whether the PV modules are damaged or abnormal, such as damage, disappearance of grid lines, hot spots, etc.; The bypass diode in the photovoltaic module junction box is working properly. When there is a problem with the PV module, replace it in time, and record the specific installation location of the PV array in detail.

1, guard rainwater entering

The battery's packaging must be tight enough to prevent rain from entering.

2, the stability of the discharge charge

During the charging and discharging process, no signs of over-voltage and under-voltage can occur.

3, temperature control

Any object has its own proper temperature. It cannot be too high or too low. We must control the temperature.

4, the charge and discharge control

This requires the realization of skills, the number of battery charge and discharge is limited, we need only to eliminate the charge and discharge even if the number of times.

1, to prevent overcharging

Solar lamp battery life and performance are closely related to the heat generated inside the battery. The heat source inside the battery is mainly due to the power loss of the internal electrochemical reaction. It can simply look at the product of the charging voltage and the charging current. In the oxygen recombination reaction, the float current will increase to generate more heat. At constant voltage charging, the float current will increase with temperature, which in turn will increase the temperature further. Thermal runaway is a unique phenomenon caused by the structure of valve-regulated sealed batteries. Thermal runaway often brings serious hazards such as battery water loss, shell 'drum belly', etc. Severely causing the battery to be scrapped. To prevent overcharge is to strictly follow the manufacturer's instructions to provide the charging voltage value. Now all of the combined power supplies can be set up and intelligent management can be realized. The first thing to note is that the correct settings must be made first, and secondly, unauthorised personnel should not be able to easily change them.

2, to prevent the lack of charge

Contrary to over-charging, insufficient charging is mainly caused by a low or excessive charging voltage setting. Or there is a problem with the rack system.

3, to prevent over-discharge

The depth of discharge is closely related to the number of charge and discharge cycles (service life) of the battery design. For example, when the depth of discharge is 5%, the number of cycles is 10 000. When the depth of discharge is 50%, the number of cycles is only 800 times. Severe over-discharge will cause the battery can no longer be activated to the best state, or even scrapped. Different discharge rates have different discharge times and end voltages. The effective capacity released is also different and is affected by the ambient temperature. Here is no longer a list and draw the relevant curve, battery manufacturers of different specifications are given. Maintenance personnel should pay attention to it and strictly set it in the monitoring unit according to relevant data, and should not be changed casually. Now rack power manufacturers have designed the battery power-off function, that is, when the solar street light battery discharges to the set termination voltage, the battery discharge loop is automatically cut off through the monitoring instruction. More manufacturers take into account the monitoring unit for some reason (depending on the power supply) can not detect the battery termination voltage or unable to issue instructions when the other device is forced to cut off the circuit. Therefore, maintenance personnel should also pay attention to the reliability of these hardware circuits during inspections, and check and maintain them.

4, control the ambient temperature

When the battery temperature rises, the electrolyte activity increases, the internal resistance of the battery decreases, and the floating current increases. As a result, the corrosion of the conductive element increases and the life decreases. Conversely, the electrolyte activity decreases, the internal resistance of the battery increases, and the battery discharges to the load. The ability is weakened. Therefore, it is very necessary to monitor and maintain the temperature of the solar street lamp battery and control and maintain the ambient temperature. At the same time, temperature compensation must also be performed on the charging voltage in order to avoid overcharging at high temperatures and undercharging at low temperatures. Most places where VRLA battery packs are used have controlled the ambient temperature at around 25 degrees Celsius. The accelerated life test shows that the ambient temperature rises by 10 degrees without adjusting the charging voltage, and the solar street lamp battery life will be reduced by half.

5, to replace the faulty battery in time

Due to the process difference of each monomer, the long-term float may be gradually 'backward', so in the monitoring unit there will be a regular charge management function for the battery pack in order to activate this backward monomer, so that it does not Backward. But often lags behind and may eventually become a faulty battery. We can use a variety of methods to determine whether it has been afflicted, such as its own capacity test, or online testing of its internal resistance. The key is to replace the faulty battery in time, which is very important for the availability of the solar street light battery pack and the entire group life.

6. It is recommended to regularly conduct battery capacity test and discharge test. The capacity test is for the physical examination of the battery pack. Of course, the workload is relatively large. However, considering the needs and possibilities, it is recommended that sampling tests be conducted when conditions are met.

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