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 The battery is an important part of the UPS system,Its pros and cons are directly related to the reliability of the entire UPS system.At the same time, its price is relatively high, generally accounting for the cost of UPS system1/4 to 1/3 of that. Practice has proved that battery failure accounts for UPS.More than 40% of the overall system failure, it is one of the devices with the shortest mean time between failures. Therefore, the choice of UPS battery is not only related to economic cost but also directly affects the uninterrupted power supply of UPS power supply. 1.The feature of UPS battery. Different power devices need to be configured to match their characteristics. When choosing a UPS battery, firstly you should make clear about features of UPS batteries.  Conditions that UPS batteries should meet:(1) Valve-regulated drill-acid battery;.(2) The battery backup time is generally within 2h.High current discharge performance;(3) Supply power to the load through the inverter;(4) Generally 12 V/ell (2 V/(el) is rarely used;(5) The service life is generally 3-8 years.  2 Confirmation of battery capacity The Confirmation of battery capacity is important for UPS system design content. Too high and too low battery capacity for UPS system Operation is unfavorable. If the capacity is too high, the investment cost will increase.And it is easy to cause deep discharge of the battery with a small current, causing permanent damage to the battery. if the capacity is too low, it cannot meet the uninterrupted power supply of the load requirements, and high-current charging and discharging will shorten the battery life.Therefore, the correct choice is compatible with UPS capacity and load capacity is to control the investment cost of the UPS system to ensure the key to uninterrupted power supply reliability. 3 How to configure the battery The voltage of single battery is 2V, 4V, 6V, 12V, etc. Under the same capacity configuration, the single battery voltage is Higher, the cheaper the whole battery pack. Considering the cost, installation, Maintenance and other factors, UPS battery-generally choose the single battery voltage as12 V. Because a 380V system requires 32 units 12 V batteries And 2V batteries need 190 units which brings about installation and maintenance a lot of inconvenience. The higher the single battery voltage, the greater for the unbalanced possibility, the faster the deterioration. therefore, the 12 V single battery Security is poor. If one 12 V battery is broken, the whole set is decreased 12V. So many designs will use 2 groups or connect the batteries in parallel, if any group of batteries is damaged, other groups of batteries can be used, improved the safety of power supply. But too many battery packs in parallel will result in capacity loss and a decrease in cell voltage balance, resulting in the capacity is reduced and the life is shortened, so it is best not to connect battery packs in parallel more than 4 groups. 4 considerations of Battery life Battery life refers to the number of battery charge-discharge cycles at a certain depth of discharge in a constant temperature environment, not the true lifespan. The battery's ambient temperature, discharge frequency, depth of discharge, charging voltage, ripple current and other factors will affect battery life. Generally speaking, UPS battery life is divided into four grades: 3-5 years, 5-8 years, 10 years, and 10 years. According to experience, the actual battery life is usually 50% to 70% of the nominal life. Choosing a long-life battery also means more expensive prices and more comprehensive maintenance. Therefore, when choosing the battery life, one should not simply seek  for a long life, but should comprehensively consider the expansion and development of the communication system, the UPS update age, the battery price, and the maintenance status. At present, the battery life of small UIs (under 10 kVA) is generally 3 to 5 years, and the battery life of large and medium UPS (above I0kVA) is generally 5 to 8 years. 5.Selection for UPS brand.European brand batteries generally use 20 ℃ as the standard operating temperature, while China, the United States and Korea all use 25 ℃ as the standard. Generally speaking, at a discharge rate of 10 h, for every 1 degree increase in temperature, the capacity increases by 0.6%. Therefore, install the battery at a temperature of 20 ℃ in an environment of 25 ℃, and discharge capacity will increase slightly due to temperature rising. The principle of electrochemistry shows that the life span will be shortened by 50% every time the temperature rises by 10℃. If keeping the original life of the battery, The ambient temperature must be controlled at 20 ℃. so in areas with higher temperatures in the south, the daily air-conditioning electricity bill will be relatively higher, increasing operating costs. In addition, each manufacturer, each series, and each batch of batteries have quality differences. The real quality of valve-regulated lead-acid batteries. It is difficult to identify. Therefore, when choosing a battery, it is necessary to think about long-term used experience, preferably products with strong professionalism and high cost performance, and products with good after-sales service. If you don't know what brand to choose, I recommend VELA to you, we can provide you with high-quality and good services, welcome to give advice on us. Summary With the rapid development of computers and networks, UPS power supplies have been widely used in communication systems. Therefore, how to choose UPS batteries has become an important topic for telecommunication power workers. According to the characteristics of the UPS battery, in order to select a suitable battery. a comprehensive analysis is carried out from various aspects such as battery type, capacity calculation, configuration mode, life and brand.

Solar Power Has Been Developed RapidlyWith the increasingly serious energy shortage and environmental pollution, all countries are looking for solutions to the energy crisis. The use of solar energy, a renewable energy source, has led to the rapid development of solar photovoltaic technology. Solar energy is the most direct, most common, and cleanest energy source on the earth. As a huge renewable energy source, the radiant energy reaching the surface of the earth every day is equal to 2.5 billion barrels of oil, which can be said to be inexhaustible energy. This article introduces the working principle and composition of solar energy as the usage of the street lights. The Working Principle Of The Solar Energy-efficient Street Light SystemThe working principle of the system is: solar panels receive solar radiant energy and converted it into electric energy output by the advantage of the principle of photovoltaic effect during sunshine, and generates a constant voltage charging current, which is charged to the energy storage battery through the solar controller. At night, when the sunlight illuminance weakens to a certain degree and the open-circuit voltage of the solar panel drops to the set value, the solar controller detects this voltage value and then acts, the light control starts automatically, and the battery transfers to the load through the controller. Power supply to light the ceramic metal halide lamp. To light the ceramic metal halide lamp(HID), it must be equipped with a corresponding metal halide lamp rectifier. When starting, the trigger generates an instantaneous high voltage (6KV) to ignite, and then the rectifier is ballasted to maintain the load in normal operation.The Composition Of Solar Energy Efficient Street Light System Solar high-efficiency street lights are mainly composed of solar cell modules (PV MODULE), energy storage batteries (BATTERY), and solar Controller, ceramic metal halide lamp(HID) and metal halide lamp rectifier.1. Solar Cell Modules (PV MODULE) Solar cell components mainly include monocrystalline silicon solar cells, polycrystalline silicon solar cells, and amorphous silicon solar cells.The photoelectric conversion efficiency of monocrystalline silicon solar cells is about 15%, and the highest is 24%. This is the highest photoelectric conversion efficiency of all types of solar cells at present, but the production cost is so high that it cannot be widely used in large quantities or used universally. The production process of polycrystalline silicon solar cells is similar to that of monocrystalline silicon solar cells, but the photoelectric conversion efficiency of polycrystalline silicon solar cells has to be reduced a lot. The material is easy to manufacture, saves power consumption, and has a lower total production cost. Therefore, it has been extensively developed. The manufacturing method of amorphous silicon solar cells is completely different from monocrystalline silicon and polycrystalline silicon solar cells. The process is greatly simplified, the silicon material consumption is low, and the power consumption is lower. Its main advantage is that it can generate electricity even in low light conditions.2. Solar Battery According to the general load, the daily power consumption is 16.7AH. When the battery is full, it can work continuously for 7 rainy days, plus the first night's work, the battery capacity: 6.7x*(7+ l)=133.6(AH), just choose 2 batteries of 12V150AH to meet the requirements. Our company can provide you with many kinds of solar cells with different capacities, with good quality and long service life. For example, 12V 75AH and 12V 150AH are very popular models. If you want to know more, please leave us a message on our website or you can check directly by https://www.velabattery.com/12v-75ah-agm-battery-for-storage-poweror or https://www.velabattery.com/12v-150ah-vrla-battery-with-vela-brand.3. Solar Controller The solar controller uses a single-chip microcomputer as the core processing chip, which has the characteristics of omni-directional, fully automatic, multi-functional and high-efficiency point, can meet the long-term and reliable operation of solar high-efficiency street lights under various conditions, with the following characteristics: ①The solar controller adopts MPPT technology (solar maximum power tracking technology), which can make the controller work in rainy days or after the battery is deeply discharged, it can obtain a current that can increase the plate capacity by 13 times. Maximum power point tracking (MPPT) makes the solar system always work in the maximum working state of power output, ensuring maximum solar output power under any light conditions, improving photoelectric conversion efficiency, more effective use of solar energy, and improving the efficiency of the entire system. ②The solar controller works according to the remaining capacity of the battery S0C. When the lights are turned on every night, the smart chip of the controller calculates the remaining capacity of the battery according to the mathematical model, and automatically adjusts the lighting time according to the size of the S0C, so the system always works at the minimum Load work, so that the battery can be restored to the floating state as soon as possible, effectively protect the battery, extend the service life of the battery, and greatly improve the reliability of the system.4. Metal Halide Lamp Rectifier A metal halide lamp rectifier is a device that restricts current and generates an instantaneous high voltage on fluorescent lamps. It is made by winding enameled wire on an iron core made of silicon steel. Such a coil with an iron core will generate self-inductance when it is turned on/off instantaneously. High voltage is applied to the electrodes (filaments) at both ends of the fluorescent tube.5. Ceramic Metal Halide Lamp(HID)It is a discharge lamp that is operated by an AC power source and produces arc discharge in the mixed vapor of mercury and rare metal halide. The metal halide lamp is a third-generation light source made by adding various metal halides to the high-pressure mercury lamp.Solar Battery For Street Light Has Been Very PromisingThe cost-effective characteristics of solar energy-efficient street lights are quite obvious, using green environmental protection, renewable energy, one-time investment, Long-term benefit. In lighting projects such as city square beaches and high-end villa areas, solar lamps will be the preferred lamps. Decorative lamps are favored by investors. Compared with the renewable, clean, and pollution-free solar energy and the environmental protection and energy saving of ceramic metal halide lamps, Conventional fossil energy sources are becoming increasingly tense, and the emissions generated after use will cause increasingly serious pollution to the environment. Therefore, as an emerging outdoor lighting product, solar lighting fixtures will bring us infinite vitality and broad market prospects.

 1.The origin of gel battery The Early gel lead-acid batteries were developed by Sonnenschein in Germany in the 1950s and became popular in the 1970s. Mixing sulfuric acid with silica gel can convert liquid electrolyte into semi-hard paste, making the gel maintenance-free. The AGM that appeared in the early 1980s provided similar performance to gel, but each system provided slightly different characteristics to meet unique market needs. Gel batteries are widely used in large and small UPSs, while AGM has carved up the market with start-up and deep-cycle applications. There are two primary types of VRLA batteries, Gel and AGM batteries are part of the valve-regulated lead acid (VRLA) family to make the traditional flooded lead acid maintenance free. 2.What is gel technology ? Gel technology is a type of VRLA battery where the liquid electrolyte is suspended in a fumed silica gelling agent causing it to partially solidify. The gel agent offers superior resistance to leakage and enhance durability with little maintenance and no watering.The GEL battery is a highly robust energy-system with best-in-class deep cycle properties, allowing unmatched and safe depth of discharge. GEL also has the smallest volume and weight ratio for the amount of Watt hours supplied. 3.How does a gel battery work? A gel battery is a valve regulated, lead acid battery in which a pre-determined quantity of an electrolyte, together with sulphuric acid is combined with silica fumes. This chemical reaction results in an immobile, gel like mass giving these batteries their name. The gel batteries are virtually maintenance free as they uses one-way open valves that allow the internal gasses to recombine into water, hence removing any need to check to top up distilled water or monitor water level. Gel batteries are extremely robust and versatile. They are safe to be installed in places where ventilation is limited, due to fact that they have a very low (virtually zero) gas/fumes production, which means you can even install the batteries inside your home. 4.The advantage of the gel battery Gel Batteries are becoming increasingly popular for solar systems due to the following advantageous reasons: (1 )Gel has longer service life span than AGM Gel batteries generally has a longer life than AGM batteries; improving heat transfer to the outside world is one of the reasons. (The gel separator transports heat, and the absorbent glass mat of AGM acts as an insulator.) (2). Another advantage of the gel is the dome-shaped performance curve, which allows the battery to remain in the high-performance range for most of the service life, and then quickly drop to the end of its life; in contrast, AGM gradually disappears . (3)The gel has good performance in high temperature environment. As we all know, gel has good performance in high temperature environment and is less prone to vulcanization than other systems, but it needs correct charging and floating pressure. In contrast, AGM has a better current output at low temperatures due to low internal resistance. It is said that the period of gel is larger than that of AGM. The secret is that its design can hold more acid. Due to the high internal resistance, gel batteries are not used for high current applications. 5.The disadvantage of the gel battery.  Though the gel battery has many advantages, it still has some disadvantages or limitations. Here just listed a few,Higher manufacturing cost than AGM;Sensitive to overcharging (gel is more tolerant than AGM);Must be stored in charged condition (less critical than flooded)AdvantagesMaintenance free; can be mounted sideways; low self-dischargeLong lasting due to its ability to transfer heat to the outsidePerformance stays high until the end of life, then drops rapidlyLimitationsHigher manufacturing cost than AGM Sensitive to overcharging (gel is more tolerant than AGM)Must be stored in charged condition (less critical than flooded) 6.The application of gel battery As a storage battery, GEL is the best choice for many demanding applications including solar system ，wind generation, water pumping,  cathodic protection and electric powered vehicle. GEL batteries are also essential in the latest commercial vehicles with dual battery systems, or indeed in any vehicle with extensive electric power needs. The benefits of GEL make it popular in construction, mining, agriculture and industry. The technology is also used to provide remote power, everywhere from local highways to the countryside.  VELA POWER is currently working on achieving higher performance levels through the introduction of carbon additives, re-designed negative electrodes and new grids to produce faster charging times and improved cycling performance, making GEL an even more effective supply battery.

 1.What is solar power system ?  According to the electricity demand of the Zero Carbon Pavilion project of the Shanghai World Expo, the overall performance of the solar photovoltaic system is personalized to achieve the optimization of energy saving and environmental protection effects. Traditional fuel energy is declining day by day, and at the same time, there are about 2 billion people in the world who do not have normal energy supply. At this time, people turned their attention to renewable energy, hoping that renewable energy could change the energy structure of mankind and maintain long-term sustainable development. Among them, solar energy has become the focus of people's attention with its unique advantages. Abundant solar radiation energy is an inexhaustible, non-polluting and cheap energy source.  Solar power system, Also called a solar electric system or photovoltaic PV system. A power generation system that uses the photovoltaic effect of solar cells to directly convert solar radiation into electrical energy. Referred to as photovoltaic system.solar power systems use solar panels to collect photons of light from the sun and use them to create an electrical current. To learn more about solar PV systems, please continue to review our page and then you will know How Solar Power Systems Work. On this page, we will discuss the working principle of photovoltaic system, the feature of photovoltaic system,FAQ of photovoltaic system and where you buy the kits for solar power system.  2.the working principle of photovoltaic system During the day, under the condition of light , the solar cell modules generate a certain electromotive force, and the solar cell array is formed through the series and parallel connection of the modules, so that the voltage of the array can meet the requirements of the input voltage of the system. Then charge the battery through the charge and discharge controller, and store the electric energy converted from light energy. At night, the battery pack provides input power for the inverter. Through the function of the inverter, the DC power is converted into AC power, which is transmitted to the power distribution cabinet, and the power is supplied by the switching function of the power distribution cabinet. The discharge of the battery pack is controlled by the controller to ensure the normal use of the battery. The photovoltaic power station system should also have limited-load protection and lightning protection devices to protect the overload operation of the system equipment and avoid lightning strikes, and to maintain the safe use of the system equipment. 3 the feature of photovoltaic system There are many features about photovoltaic system. In this essay we mainly share the advantages and disadvantages of it. Obviously the advantages out weight the disadvantages by the following lists.  3.1 The advantages of photovoltaic system.(1). Solar energy is inexhaustible. The solar radiation energy received on the earth's surface can meet 10,000 times the global energy demand. As long as solar photovoltaic systems are installed on 4% of the world’s deserts, the electricity generated can meet global needs. Solar power generation is safe and reliable, and will not be affected by the energy crisis or unstable fuel market.(2). Solar energy can be get everywhere, and power can be supplied nearby, without long-distance transmission, which avoids the loss of long-distance transmission lines;(3) Solar energy does not use fuel, and the operating cost is very low;(4)Solar power generation has no moving parts, is not easy to use and damage, and is simple to maintain. It is especially suitable for unattended use;(5) Solar power generation does not produce any garbage, has no pollution, noise and other public hazards, and has no adverse effects on the environment. It is an ideal clean energy;(6) The solar power generation system has a short construction period,  convenient and flexible, and can add or reduce the amount of solar power arbitrarily according to the increase or decrease of the load .3.2 The disadvantages of photovoltaic system.(1.) There are intermittent and randomness in ground application, and the amount of power generation is related to climatic conditions, and it is impossible or rarely to generate power at night or on cloudy and rainy days;(2) The energy density is low. Under standard condition, the solar radiation intensity received on the ground is 1000W/M^2. When used in large format, it needs to occupy a larger area;4.FAQ of photovoltaic system Q: Is there any radiation hazard from the photovoltaic power generation system? Answer: NO. Photovoltaic power generation system converts light energy into electrical energy according to the principle of photovoltaic effect. It is pollution-free and radiation-free. The relevant electronic devices have passed the EMC (electromagnetic compatibility) test, so there is no radiation hazard to the human body.Q: Is there a noise hazard in the photovoltaic power generation system? Answer: NO. The photovoltaic power generation system converts light energy into electric energy, and the system components will not produce noise. The noise index of the inverter is not higher than 65 decibels, and there is no noise hazard. Q: How long is the life of the photovoltaic power generation system? Answer: The earliest photovoltaic power station was built in 1989, and it is 28 years ago. Except for batteries, the design life of photovoltaic power generation systems is generally more than 25 years. 5.Where do you buy the kits for solar power system?  Well, right here on this website, of course! Our solar photovoltaic systems and kits include high-quality components that are tested and certified to the highest quality standard and are designed for optimal durability and performance for many years, we have helped many customers to design and choose the right solution. We have been the most respected manufacturers in the solar energy business.If you have any need of charge controllers, inverters, solar battery or solar panels, we can We can provide you with one-stop service. With abundant experience in the solar energy business, you can be sure at our website https://www.velabattery.com/solar-panel, we know solar power system.