When you decide to purchase all in one solar lights from the China manufacturer, you must know the manufacturer at least 4 aspects.
1. solar panel
2. Lamp housing
Below I will give examples of the most common solar flood lights on the market.
Solar panels are one of the key components of solar floodlights, which collect solar energy, convert it into electrical energy, and then store the energy in the battery to power the floodlight.
Solar panel type. Basically, there are three types of solar panels for solar lighting – monocrystalline silicon solar panels, polycrystalline silicon solar panels, and amorphous silicon (thin film) solar panels. Monocrystalline silicon panels are considered to be the most efficient, with photoelectric conversion efficiency (how much solar energy can be collected and converted into electrical energy) between 15-21%, but they are also the most expensive panels, monocrystalline silicon solar cells The board is mainly used for power supply of high-power electrical equipment such as photovoltaic power stations.
The photoelectric conversion efficiency of polycrystalline silicon panels can reach 16%, and is now adopted by most lighting manufacturers due to its low manufacturing cost. Polycrystalline silicon panels are typically dark blue, which also makes these panels easily distinguishable from other panels. Because of the high photoelectric conversion efficiency of monocrystalline and polycrystalline silicon panels, they are commonly used in large solar systems that provide electricity for residential and commercial buildings, and these panels can also be used for higher power solar streetlights. Amorphous silicon (thin film) solar panels are the least efficient, 10% or less, and are primarily used to charge low-power electronic devices. This type of solar panel is also cheaper.
In short, if you only want to use a low-power solar light to illuminate your front door or yard, you don’t have to worry too much about which type of solar panel is used on the lamp. Because the dimensions of these panels are typically very small (compared to panels used to power high-power appliances), their efficiency differences are virtually insignificant.
One of the most important measurements for solar panels is the wattage. It shows the amount of electricity produced by a solar panel under ideal conditions. For example, a 10 watt solar panel will output 10 watts (Wh) of electricity per hour. The greater the brightness of the illumination, the higher the power required by the luminaire. For example, low-power lamps that produce hundreds of lumens of light can be charged with 5-8 watts of solar panels, while lamps with larger fluxes require at least 10-20 watts of solar panels.
In most cases, larger solar panels will produce higher power because there are more solar panels to collect. Sometimes you will see that high-power solar street lights are not only equipped with one, but also equipped with two or more solar panels that generate enough energy to charge their large-capacity batteries.
size. As mentioned earlier, the size of the solar panel will depend on the intensity of the light and what material the panel is made of. Single crystal/polycrystalline silicon solar panels and thin film solar panels produce the same amount of energy and require less area. Therefore, before purchasing solar lamps, you should consider not only whether there is enough sunlight during the day in the installed area, but also whether there are enough physical areas to install the solar panels (if you want to use high-power floodlights).
Shell material and production process
Outdoor floodlights must be properly water- and dust-proof, and can withstand the wind, sun and rain under any conditions throughout the year.
Light body material. The floodlight housing is usually made of plastic or aluminum. Most high power floodlights are aluminum enclosures to maximize protection of the lamp’s internal components from any external impact that could damage the lamp body.
However, there are also some cheaper spotlights made of plastic casing. Of course, plastic does not always mean poor quality, because most manufacturers’ lamps use a very durable ABS plastic casing (except for some bad manufacturers), which not only protects the lamp from impact and water intrusion, but also High and low temperature resistance. If you find a solar projector with a very low-priced aluminum casing, don’t think that you have found the baby, because these lamps may be poorly waterproof or the manufacturer may cut corners elsewhere.
After determining the material of the lamp body for the manufacturer, another important indicator is to determine the size of the lamp body. Do not ask the wattage of the lamp. The important thing is to say 3 times! ! ! Never ask the wattage of the lamp! Never ask the wattage of the lamp! Never ask the wattage of the lamp!
The motion sensor is responsible for detecting motion within a certain range around the floodlight and turning it on when motion is detected. The three most common types of motion detectors are active sensors (which detect motion by transmitting microwaves and monitor changes in wave response time), passive infrared sensors or PIR (detecting motion by scanning infrared thermal changes in the monitored area) and combined sensors. In fact, all solar sensors with motion sensing use PIR sensors to detect motion because they are easy to adjust and do not pick up the movement of random objects such as branches or wind blowers that are common outdoors.
The function of detecting range, distance, delay time and light sensitivity.
The range and distance settings determine the angle at which motion can be detected. Most motion sensors allow motion to be detected at 180 degrees around the sensor, while some special sensors can even detect 360 degree angle motion. The distance allows the adjustment detector to receive the distance of motion.
The delay or detection time setting determines the amount of time that illumination will illuminate after motion is detected. The light sensitivity setting determines the brightness required for the sensor to begin picking up motion. Most motion sensing (or radar-sensing solar projectors can capture motion at 120-180 degrees wide angle and approximately 8-10M long distances).
type of battery. There are currently four different types of rechargeable batteries on the market for solar lamps – lithium phosphate (Lifepo4), lead acid, metal hydride nickel (nickel hydrogen) and cadmium nickel (nickel cadmium).
Some low-power solar lights are powered by standard AA or AAA battery-sized nickel-cadmium or nickel-metal hydride batteries. These batteries are small, lightweight, inexpensive and easy to replace, making them ideal for low-power solar lighting.
If you choose to use a nickel-cadmium battery or a nickel-hydrogen battery, nickel-metal hydride batteries have many advantages over nickel-cadmium batteries. For example, the capacity of a single charge is larger and the working time is longer. These characteristics are very practical for solar lamps.
Lithium-ion batteries are the only battery that has a larger capacity than nickel-metal hydride batteries, and the cost is higher. Although you will find that nickel-cadmium batteries are almost exclusively used in low-power solar lamps, nickel-metal hydride batteries are used in a wider range of applications, including some high-power solar lamps, sometimes using nickel-metal hydride batteries.
On the other hand, high-power solar lamps generally use lithium-ion or lead-acid batteries (it is now rare to use lead-acid batteries). Lithium phosphate (Lifepo4) batteries have a higher specific energy than lead-acid batteries (which means the battery can carry more energy) while maintaining a smaller size and weight, with a cycle life of up to 2000 cycles.
As the cost of lithium phosphate batteries continues to decline, the use of lead-acid batteries in solar lamps is also decreasing. (About the battery, I will write an article later to introduce.)
capacity. The capacity of the rechargeable battery shows the maximum energy that can be stored in the battery, measured in ampere-hours (Ah) or milliampere-hours (mAh). In general, the larger the capacity of the battery, the longer it lasts. On average, nickel-cadmium batteries have the smallest solar cell capacity of about 600 mAh, followed by 2000 mAh nickel-metal hydride batteries. Lithium-ion batteries have a wide range of solar lamps ranging from 2000 mAh to 6000 mAh.
The capacity of the battery alone can’t tell you how long a solar light can be bright (brightness, solar panel wattage, motion sensor and other factors are also important), but it gives you a deeper understanding of the overall quality of the lamp. If you see a high-power solar floodlight, it is equipped with a small capacity (less than 2000 mAh) Ni-MH battery or lithium-ion battery, it is best to look at other manufacturers’ products, because this configuration is not May store enough charge during the day to provide overnight lighting
In order to increase the duration of the illumination, the solar light is equipped with a motion sensor that turns on the light at a given time interval (usually within a few seconds) and turns off the light after a preset time when motion is detected in front of the light. This helps save energy and provides continuous illumination.
Well, the above is a few aspects that need to be paid attention to when choosing a solar light. Due to the limitation of time and space, many details can’t be clearly explained one by one. Later, I will continue to issue a text explanation. Everyone remembers to keep paying attention!
In order to let you know more about solar photovoltaic products, provide better solar energy product solutions. Hope that everyone interested in solar energy products can find the right solar products! Thank you for your attention.
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