Tag Archive for: battery charge

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5 Tips to Make Solar LED Lights Last Longer

It is important to properly position and maintain luminaires or lighting fixtures in order to make Solar LED Lights last longer.

By doing this, we let Solar LED Lights absorb as much solar irradiance energy as possible for longer periods of lighting.

1. Regular Cleaning of Solar Panel

Solar LED street lights for outdoor need solar panels to absorb radiant energy. Cleaning helps solar panels to maintain the maximum energy absorption of solar radiation and provide long-term illumination.

During the production in our factory and the following on-site installation of solar light fitting, we have considered optimizing the product to keep it clean enough and avoid attracting too much dust and debris. For example, the installed solar panels usually keep an inclined angle to prevent birds from resting on it. Bird droppings, leaves, and other debris can hinder the solar panel’s ability to collect sunlight.

You also need to pay attention to the degree of cleanliness. If air pollution in some areas are serious, or some cities are near the desert, then the dust is more than other places, you need to wipe the panel surface regularly.

Obviously, stacked snow on Solar lights panel will affect the absorption of the solar irradiation energy. As a result, the lighting system does not have a peak performance if you are in an area that is cover with large amounts of snowfall, be prepared to take them down for the winter.

 

2. Place Lighting Luminaries in an Unobstructed Place

Make sure that they are in a place with the strongest sunlight throughout the day and not blocked by the shadows of plants or buildings. Plants are not possibly blocking the panel all the time, but it reduces the time of direct sun shines on the solar panel. It means that the length of lighting available at night will be reduced. Take necessary measures to adjust the installation distance, or trim the branches to ensure sufficient sunlight.

 

3. Improper On-site Parameters Setting Resulting in Shorter Lighting Time

According to many on-site feedbacks, some construction workers respond that they have not been informed of the specific function and use of the remote control of solar lamp outdoor. They are only responsible for lighting up the lamp and care about nothing else. In such cases, the parameters may be set incorrectly which is causing abnormal lighting, excessive battery consumption, and reducing lighting hours. The remote control of LUXMAN luminaire with a humanized control method design is simple and convenient. You can switch to the best mode that suits your needs. Before installation, confirm with us for selecting the best mode for your location and make sure it is the correct mode during installation.

 

4. Long Time Rainy Days Reduce Hours of Illumination

If the weather forecast says it will rain for a long period of time and exceed the maximum designed lighting time of the product, you can choose to turn off the solar led lights with switch. This method is mainly to avoid inefficient charging on rainy days and extend battery life.

 

5. Malfunctions of Solar LED Street Lights Reduces the Lighting Time

According to the indicators of solar light, our users can identify whether the problem belongs to the solar panel, the LED bulb, or the battery. Check for the possible hidden problems and troubleshoot to ensure that the lighting time can reach the desired length.

Some split solar panels have longer distances between solar panels and lamps,and the long distance has caused unexpected problems. Extending the solar panel connecting wire at will may cause line loss, lower charging efficiency, and affect lighting time. There is also one reason that the user might purchase wire with poor quality.

Another typical problem is the aging problem of the product. With the accumulation of service hour, the battery quality naturally ages, especially the lead-acid battery which is used in earlier products. The number of charge and discharge is relatively small for a lead-acid battery. The battery needs to be replaced when it expires or out of performance. Just change it and restore long hours of lighting.

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Lithium iron phosphate batteries (LiFePO4 battery) or Ternary lithium battery ?

How to choose a solar street light battery?

As we all know, more and more people are buying integrated solar street lights, and one of the keys points of the Solar Street Light quality is the selection of solar street light batteries. Usually, we use Ternary Lithium batteries or LiFePO4 batteries. Let’s compare the difference between the two.

First of all, why we use lithium batteries?

Lithium batteries (Li-ion, Lithium Battery): Lithium batteries are widely used because of their advantages of a lightweight, large capacity and no memory effect. The energy density of lithium batteries is very high, and their capacity is 1.5-2 times that of Ni-MH batteries of the same weight. (SYLVANIA solar street lamps adopted Ni-MH batteries) Lithium also has a low self-discharge rate. In addition, lithium batteries have few “memory effects” and no toxic substances, which are also important reasons for their wide application.

32700 battery

Ternary Lithium batteries and LiFePO4 batteries are the two main types of Lithium Batteries that are used for Solar lighting products.

Ternary lithium battery Vs lithium iron phosphate battery

I:  The material system of a LiFePO4 battery and a ternary Lithium battery is different.

II:  A LiFePO4 battery is a 3.2V voltage platform, with a cycle life of more than 2000 charges.

III:  The ternary lithium battery is a 3.7V voltage platform, and the cycle life depends on different manufacturers, different models, and processes, and generally, it is 500-800 charge cycles.

IV:  LiFePO4 batteries offer better high-temperature performance, while ternary lithium batteries have better low-temperature performance.

V:  LiFePO4 solar street light batteries are safer.

Further analysis of the two kinds of lithium batteries,

LiFePO4 batteries are characterized by high safety, high rate charge-discharge characteristics and long cycle life. The battery capacity is 80% of the initial capacity after 1600 cycles when the charging condition is 1C multiple charging to 3.65V, then the constant voltage is changed to 0.02C, and then the discharge voltage is 2.0V at 1C multiple charging to 2.0V cut-off voltage. LiFePO4 batteries also have stable charge-discharge characteristics and good fast charge characteristics. In addition to its long life and excellent charge-discharge performance, the greatest advantage of LiFePO4 batteries is their safety. The chemical properties of liFePO4 batteries are stable and the high-temperature stability is good. The LiFePO4 batteries begin to decompose at 700-800 C, and will not release oxygen molecules in the face of impact, needling, short circuit, and so on. It will not produce intense combustion and has high safety performance

32700 battery cell

The disadvantage of a LiFePO4 battery is that its performance is greatly affected by temperature, especially in a low-temperature environment, where the discharge capacity and capacity will be greatly reduced. In addition, there are some performance defects in lithium iron phosphate. The energy density of the battery is low, only the weight energy density of the battery is 120Wh/kg. If the energy density of the whole stack, including the battery management system, heat dissipation, and other components is calculated, it will be lower. The cost of material preparation and the cost of battery manufacturing are higher, the yield of the battery is low and the consistency is poor. The cost per pack is higher than that of ternary lithium batteries

Ternary lithium batteries refer to lithium batteries containing transition metal lithium-intercalated oxides containing nickel, cobalt and manganese, which can be expressed as LiMnxNiyCo1-x-yO2 (0 < x < 0.5, 0 < y < 0.5). This material combines the advantages of lithium cobalt oxide, lithium nickel oxide, and lithium manganate, and forms a ternary synergistic effect of three materials, whose comprehensive properties are superior to any single combination compound. Weight energy density can reach 200Wh/kg

The safety of ternary lithium batteries is poor. The thermal stability of ternary lithium batteries is poor. They will decompose at 250-300C. When it encounters flammable electrolytes and carbon materials, decomposition will start at a point. The heat generated will further intensify the decomposition of the positive pole, and it will deflagrate in a very short time. In a car accident, the impact of external force can damage the battery diaphragm, which will lead to a short circuit, and the heat generated during the short circuit will cause the thermal temperature to rapidly rise to more than 300 C, creating the risk of spontaneous combustion. Therefore, for ternary lithium batteries, the battery management system and heat dissipation system are very important.

From the solar street light battery knowledge above, you can know whether the light purchased is a high or low-quality version.

If you purchase Integrated solar LED street lamps only marked “Lithium battery”, you have to know it uses LiFePO4 batteries or other Lithium batteries. Most of the time it will be ternary Lithium batteries. If it is ternary lithium power, do not expect a five-year service life guarantee.

 

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