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Two Ways to teach you how to choose the best solar street light battery



                                           
                              Two Ways to teach you how to choose the best solar street light battery

As we know, The battery is a very key component of the solar-powered street lights system, and also a major component of the solar-powered street lights system cost,
There are several types of battery are used in solar street lights, like the ternary battery, Lead-acid, Lithium battery and so on. LiFePO4 Lithium-ion battery is the highest cost-efficiency in the market for now.But why we recommend lithium batteries for solar street light? Following are the reasons.


1. high voltage
The lithium battery has high voltage. The average voltage of a single cell can reach 3.7V or 3.2V. It is relatively equal to the series voltage of 2-4 nickel-metal hydride batteries or nickel battery cells.

2. long life span
The life of the lithium battery is very long. The service life of a lithium battery can be used for more than 6 years and up to 9 years if there is no accident. The normal use frequency is over 1500 times. If there is no accident, the number of use can reach more than 2000 times.The charge and discharge times of LiFePO4 Lithium battery is 2000 times, but Li-ion Lithium battery is only 800 times. Lifespan of LiFePO4 is 2. 5 times than Li-ion and 5-7 times than lead-acid batteries

3. Light weight
The volume of the lithium battery of the same specification capacity is 2/3 of the volume of the lead-acid battery, the weight is 1/3 of the lead-acid battery, and the second energy density is several times that of the lead-acid battery.
 
4. High temperature resistance
The electric heating peak value of lithium battery can reach 350℃-500℃ while lithium manganate and lithium cobaltate are only around 200℃. Wide operating temperature range (-20C--+75C),Very suitable for countries and regions with high temperature and sunny, such as Africa, Southeast Asia.
5. Low self-discharge and no memory effect.
In the production of lithium batteries, adding a protective plate to the lithium battery body can make the lithium battery have an overcharge and over discharge effect. The lithium battery itself has high power endurance.
6. Lithium batteries are environmentally friendly
 Lithium batteries do not contain toxic substances such as lead, mercury and cadmium.
There are 4 type of battery use in solar street light
1)smf battery : 1 year life bulk in size 12v
2)lead acid battery : 1year life large size and weight.12v
3) Lithium Ion Battery : 3-5years life and compact size 11.1v
4) lithium iron phosphate battery (LiFePo4) : 8-10 years life compact size, 12.8v

In summary, the above is the advantage of using lithium batteries for solar street lamps. Lithium batteries can be cyclically charged and discharged more than 1500 times, with long life, high safety performance, and strong resistance to low and high temperatures. On the basis of our selection of lithium batteries, the use of intelligent balancing technology and intelligent dual protection technology to make the battery life longer.

Nowadays,  All in One Integrated Solar Street Lights batteries using Lithium Iron Phosphate Battery (LiEePO4) and good quality battery compare to Lithium ion Battery.

With the problem of the service life of new energy vehicle batteries, many LifePo4 batteries have been eliminated.Under the conditions of non-standard national policies and regulations and the immature use of echelon utilization technology, many manufacturers have to deal with these batteries at a low price, even by tons. Sale, so the price is extremely low, and some costs may vary from 1/5-1/10 of the normal battery.

There are currently 4 grades of LiFePo4 batteries on the market, A-class LiFePo4 battery, B-class LiFePo4 battery, li-ion battery, and D-class LifePo4 battery(Already eliminated Or have been used LifePo4 battery).

So where did these eliminated LifePo4 batteries go? For what use? It is understood that many eliminated LifePo4 batteries have just flowed into the solar street light industry, Unfortunately, more than 90% of solar street light manufacturers on the market now use this LifePo4 battery that has been eliminated which cause another disadvantage to the solar street light market that already lacks standards. The industry is more uneven, and the gap between prices and quality is greater. 

So how we distinguish these 4 types of LifePo4 batteries.

The internal resistance and voltage of the battery cells are very different, so the consistency between the batteries will be much worse, such products will have a greater hidden danger after serial and parallel connection.

Therefore, the capacity, voltage drop, internal resistance, circulation and other performance of the eliminated cell are extremely low and unstable, which not only does not meet the assembly requirements, but even if it is used for a single use, its capacity attenuation and power-down rate are extremely low. Stable, the user experience must be extremely bad,
  1. A- class LifePo4 batteries.
 A- class LifePo4 battery refers to the battery capacity, thickness, length, width and other parameters. The battery manufactured in accordance with the standard is called A class.

2. B- class LifePo4 batteries.

 B- class LifePo4 batteries. refers to a slight gap in battery capacity, or the length, width and thickness do not meet the order requirements, and the price is cheaper than product A. In addition, product A is generally placed in the warehouse. If it has not been shipped for 3-6 months, it is also B class

3. C- class LifePo4 batteries.
C-class LifePo4 batteries is indeed saying that the battery of product B has been placed in the warehouse for more than 8 months. If it has not been shipped, it can be called product C. The battery of product C is due to the long storage time. With the self-discharge and dust, water For the aging of gas, the performance of the C-type cell is generally only about 50-60% of the A-type cell of the same model. The safety of the C-type battery is poor. In addition, the C-type battery is not durable. After several cycles of charging, the performance is greatly reduced.

4.D-class LifePo4 battery
D-class LifePo4 battery(Already eliminated Or have been used LifePo4 battery), Capacity, pressure drop, internal resistance, circulation and other performance are in a very low and unstable state, not only can not meet the assembly requirements, its service life is usually 6-8 months, you need to replace the battery, which is also the most on the market. Battery.
Nowadays more than 90% solar street light manufacturers use C-class and D-class LifePo4 battery. After several months of use, there is no problem. After half a year, there are a series of problems such as lithium battery damage and light source not bright.


Summary: If you have requirements on the life and quality of solar street lights, the batteries eliminated are not recommended for use in solar street lights. If you have no requirements for the product, Belinda still recommends that regardless of the manufacturer, engineering company, or even government departments, you should choose high-quality products to serve the public, be responsible for products, users, and society.

Editor: Belinda     web:cmoonlight.com
 

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