Intersolar Europe 2024 , held from June 19 to 21 at the New Munich International Exhibition Center in Germany, brought together industry leaders, innovators, and professionals in the solar energy sector. Our company was proud to be part of this vibrant event, showcasing our latest products, technologies, and solutions.

Key Highlights

1. Cutting-Edge Products: Our booth attracted a diverse audience, where we unveiled our innovative solar products and research developments. From advanced photovoltaic panels to energy storage solutions, we demonstrated our commitment to sustainable energy.

2. Global Networking: We engaged with exhibitors and experts from around the world, fostering valuable connections. These interactions allowed us to gain insights into market trends, emerging technologies, and best practices.

Conclusion

Intersolar Europe 2024 was an enriching experience, reinforcing our dedication to solar innovation. As we look ahead, we eagerly anticipate next year's event, where we'll continue driving the future of solar technology.

On June 13, EITAI made a brilliant appearance at the Vietnam Energy Storage Exhibition, showcasing its latest residential energy storage and industrial and commercial energy storage solutions and products.This green energy event attracted the attention of countless visitors and industry professionals. EITAI attracted everyone at the scene with its outstanding technology and innovative products.

Outstanding products shine in Vietnam

EITAI highlighted its representative energy storage battery ELESHELL 14.3K/16K, which provides a comprehensive and reliable solution for home energy storage.ELESHELL 14.3K/16K adopts a multi-level protection design with a protection level of up to IP54 to adapt to various harsh environments. The universal wheel design allows for flexible deployment and fully meets the diversified needs of household energy storage project capacity and application scenarios in the market.

EITAI's star product ELESHELL 9.6K/10.2K is still shining brightly at the exhibition, and it can meet all customers' expectations for energy storage products.In addition to excellent safety performance, the significant economy has won unanimous praise from the audience.

Smart household, zero-carbon life

To create a better future life together, EITAI brings a new household smart green electricity solution to household scenarios with its cutting-edge technology and innovative design concepts.Accurately grasp the global market, the solution includes ET-HV32S-5K and liquid-cooled ETBTMS series household energy storage products, with its wide applicability and flexibility, it can easily meet the diverse needs of various types of overseas households.

The Vietnam Energy Storage Exhibition has come to an end, and we will meet in the future of green and sustainable development.EITAI will continue to focus on technological innovation and product development, continue to provide customers with comprehensive and high-quality smart energy solutions, and work together with more partners to jointly write a new chapter in green energy and zero-carbon life.

Recently, floods have hit Hpakant and Myitkyina in Myanmar, which has had a serious impact on the lives of local people. Houses in many areas have been flooded, farmland has been destroyed, and a large number of people have been trapped.

On July 5, 2024, Eitai extended a helping hand to the people in the disaster-stricken areas of Myanmar, showed love, actively donated 6 million Myanmar Kyats.

We hope that through our joint efforts, the people in the disaster-stricken areas of Myanmar can overcome the disaster and rebuild their homes.

1. Regular charging method

Solar energy storage batteries can be charged using a charger, and the charging time is usually 8-10 hours.It should be noted that the charger can only use special solar chargers and cannot use ordinary chargers, otherwise the battery may be damaged.

2. Solar charging method

The most suitable charging method for solar energy storage batteries is solar charging.When there is sufficient sunlight, the solar panel can directly convert sunlight into electrical energy to charge the battery.It should be noted that the solar charging method requires stable and sufficient sunlight to charge normally, otherwise it may affect the charging effect.

3. Precautions

1. When using a charger for charging, it is necessary to pay attention to whether the model and voltage of the charger and battery match, otherwise it may cause overcharging or undercharging problems.

2. When using solar charging, you need to pay attention to whether the battery is placed in a stable position to ensure sufficient light. You also need to be careful not to expose the battery to high or low temperatures for a long time.

3. Check the battery charging status regularly to ensure that the battery is within the appropriate power range, and do not overcharge or over-discharge the battery.

In short, the correct charging method and precautions for solar energy storage batteries are very important for extending battery life and improving battery efficiency.

I hope this article can provide some reference for users who use solar energy storage batteries.

The battery system is the core of the entire energy storage system, which is composed of hundreds or thousands of single cells connected in series and parallel.Battery inconsistency mainly refers to the inconsistency of parameters such as battery capacity, internal resistance, and temperature.When inconsistent batteries are used in series and parallel, the following problems will occur:

1) Loss of available capacity

In the energy storage system, single cells are connected in series and parallel to form a battery box, and battery boxes are connected in series and parallel to form a battery cluster. Multiple battery clusters are directly connected in parallel to the same DC busbar.The reasons for the loss of available capacity due to battery inconsistency include inconsistent series connection and inconsistent parallel connection.

· Battery series inconsistency loss

According to the barrel principle, the series capacity of the battery system depends on the single cell with the smallest capacity.Due to inconsistencies such as differences in the individual cells themselves and temperature differences, the available capacity of each individual cell is different. Cells with small capacity are filled first when charging and empty first when discharging, which restricts the charging capacity of other individual cells in the battery system. The discharge capacity causes the available capacity of the battery system to decrease.Without effective balancing management, as the operating time increases, the attenuation and differentiation of the single cell capacity will increase, further accelerating the decrease in the available capacity of the battery system.

· Inconsistency loss of battery cluster parallel connection

When battery clusters are directly connected in parallel, a circulation phenomenon will occur after charging and discharging. The voltages of each battery cluster are forced to be balanced. When the battery cluster with smaller internal resistance is fully charged or discharged, other battery clusters must stop charging and discharging, causing inter-battery cluster charging. Dissatisfaction and inability to discharge the battery will cause battery capacity loss and temperature rise, accelerate battery decay, and reduce the available capacity of the battery system.In addition, due to the small internal resistance of the battery, even if the voltage difference between clusters due to inconsistency is only a few volts, the uneven current flow between clusters will be very large. As shown in the measured data of a power station in the table below, the difference in charging current reaches 75A ( The deviation reaches 42% compared with the theoretical average value), and the deviation current will cause overcharge and overdischarge in some battery clusters; it will greatly affect the charge and discharge efficiency, battery life, and even lead to serious safety accidents.

2) Temperature inconsistency causes accelerated differentiation of single cells and shortened lifespan

Temperature is the most critical factor affecting the life of energy storage. When the internal temperature of the energy storage system rises by 15°C, the system life will be shortened by more than half.Lithium batteries generate a lot of heat during the charging and discharging process. Excessive temperature differences in single cells will cause further increases in internal resistance, capacity, etc., leading to accelerated differentiation of single cells, shortening the cycle life of the battery system, and even causing safety hazards.

How to deal with energy storage battery inconsistencies?

Battery inconsistency is the root cause of many problems in current energy storage systems. Although battery inconsistency is difficult to eradicate due to the chemical characteristics of the battery and the influence of the application environment, it is possible to integrate digital technology, power electronics technology and energy storage technology, and use the controllability of power electronics technology to minimize the impact of lithium battery inconsistency, which can greatly increase the available capacity of the energy storage system and improve system safety.

1) Eitai active equalization technology monitors the voltage and temperature of each single cell in real time to eliminate the inconsistency problem of battery series connection and increase the available capacity of the energy storage system by more than 20% throughout its life cycle.

2) In the electrical design of the Eitai energy storage system, each battery cluster is managed individually for charging and discharging, and the battery clusters are not connected in parallel, which avoids the circulation problem caused by DC parallel connection and effectively improves the available capacity of the system.

3) Accurate temperature control to extend the life of the energy storage system

The temperature of each single cell is collected and monitored in real time.Through three-level CFD thermal simulation and a large amount of experimental data, the thermal design of the battery system is optimized to make the maximum temperature difference of the single cells in the battery system less than 5°C, solving the problem of single cell differentiation caused by inconsistent temperature.

With the popularity of renewable energy, solar energy storage batteries are becoming more and more important in home, commercial and industrial applications.A reliable solar energy storage battery manufacturer can not only provide high-quality products, but also provide excellent after-sales service and technical support.This article will provide you with a detailed guide to choosing a solar energy storage battery manufacturer to help you make an informed decision.

Key factors for choosing solar energy storage battery manufacturers

1. Product quality

High-quality products are the primary consideration when choosing a manufacturer.Here are a few aspects of evaluating product quality:

Battery life: Battery life is an important indicator of energy storage batteries. A high-quality battery should have a long service life and a low decay rate.

Conversion efficiency: High-efficiency energy conversion can maximize the utilization of solar energy and reduce energy loss.

Safety: Make sure the battery has passed relevant safety certifications, such as UL (USA), CE (Europe), etc., to prevent safety hazards such as overheating and short circuit.

2. Technological innovation

Technological innovation is the embodiment of corporate competitiveness.Choosing a manufacturer with technological innovation capabilities can ensure that you get the latest and most advanced products.

Battery technology: such as lithium-ion batteries, lithium iron phosphate batteries, etc., choose manufacturers with the latest battery technology.

Intelligent management system: Advanced energy management system can optimize the operation of energy storage batteries, improve efficiency and life.

Remote monitoring and control: Remote monitoring and control via smartphone or computer to improve convenience of use.

3. Reliability and durability

Reliability and durability are the guarantee for the long-term operation of energy storage batteries.The following are several aspects for evaluating reliability and durability:

Environmental adaptability: The battery should be able to operate stably under various climatic conditions, such as high temperature, low temperature, high humidity and other environments.

Structural design: The battery structure should be strong and durable, and able to resist external shock and vibration.

4. After-sales service and technical support

High-quality after-sales service and technical support are important considerations in choosing a manufacturer.

Warranty period: Understand the manufacturer's warranty policy and choose a manufacturer with a longer warranty period.

Technical support: Ensure that the manufacturer provides 24/7 technical support to respond and resolve issues quickly.

Maintenance service: Choose a manufacturer that provides regular maintenance services to ensure long-term and stable operation of the battery.

5. Brand credibility and word-of-mouth

Brand reputation and word of mouth are important references for evaluating manufacturers.

Market share: Choose brands with high market share and good user feedback.

Customer reviews: Learn about other users'reviews of the manufacturer through online platforms, industry forums and other channels.

Successful cases: Understand the manufacturer's successful cases and partners, and evaluate their performance in similar projects.

6. Cost-effectiveness

Cost-effectiveness is an important factor in selecting a manufacturer.

Initial investment: Evaluate the initial investment cost of the battery and choose a product with high cost performance.

Running costs: Understand the running and maintenance costs of your battery and choose products with lower long-term running costs.

Payback period: Calculate the investment return period and choose products with a shorter return period.

Summarize

Choosing a suitable solar energy storage battery manufacturer requires comprehensive consideration of product quality, technological innovation, reliability and durability, after-sales service and technical support, brand reputation and word of mouth, and cost-effectiveness.Through careful evaluation and comparison, you can find the manufacturer that best suits your needs, ensuring you get high-quality, high-performance solar energy storage equipment to maximize energy utilization and optimize economic benefits.

In today's era of pursuing renewable energy, solar battery systems are gradually becoming the first choice for various application scenarios.As one of the core components of this system, Eitai lithium batteries have become one of the most eye-catching products in the industry due to their rugged and reliable characteristics.

Main features:

1. Grade A battery quality: 

The Eitai lithium battery uses Grade A batteries, which are reliable in quality and stable in performance, and can withstand long-term use and high-intensity working environments.

2. High charge and discharge current: 

The maximum charge and discharge current can reach 100A or 200A, which is suitable for various high-power demand application scenarios, such as solar battery systems.

3. Long cycle life: 

It has excellent cycle life, up to 6,000 times, the warranty period is 5 years, and the design life is more than 10 years, providing users with long-term and stable energy reserves.

4. Communication port design: 

Equipped with an LCD display with a communication port, supporting multiple communication protocols such as CAN, RS485, RS232, etc., to facilitate users to monitor and manage battery status.

5. Space-saving design: 

Adopting a wall-mounted design, it can stand beside the wall to save space and make the layout more flexible and efficient.

6. Intelligent BMS communication: 

48V intelligent BMS can be optionally configured to communicate with hybrid solar inverters of different brands to achieve intelligent management and control.

7. Sturdy and durable: 

The shell is designed to be sturdy and durable, able to withstand use in various harsh environmental conditions, ensuring the stability and reliability of the battery in long-term operation.

Application scenarios:

1、Household solar power generation system

2、Commercial building solar energy storage system

3、Industrial production line backup power supply

4、Urban microgrid energy storage system

Conclusion:

As a reliable energy storage solution, Eitai lithium batteries have excellent performance and stable quality. They are suitable for a variety of application scenarios and provide users with long-lasting and stable power support.Whether it is a home user or a commercial enterprise, choosing Eitai lithium batteries will be a wise investment and provide a reliable solution for the use of renewable energy.

Lithium iron phosphate and lithium batteries each have their own advantages, but lithium iron phosphate performs better in terms of safety and cycle life.

Introduction to LiFePO4 batteries

Lithium iron phosphate battery refers to a lithium-ion battery that uses lithium iron phosphate as the positive electrode material.The positive electrode materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, ternary materials, lithium iron phosphate, etc. Among them, lithium cobalt oxide is the positive electrode material used by most lithium-ion batteries.

Advantages of LiFePO4 batteries

1. Lithium iron phosphate batteries have a long lifespan, with a cycle life of more than 2,000 times.Under the same conditions, lithium iron phosphate batteries can be used for 7 to 8 years.

2.  Safe to use.Lithium iron phosphate batteries have undergone rigorous safety tests and will not explode even if a fault occurs.

3.  Fast charging.Using a dedicated charger, 1.5C charging for 40 minutes can fully charge the battery.

4.  Lithium iron phosphate batteries are resistant to high temperatures, and the hot air value of lithium iron phosphate batteries can reach 350 to 500 degrees Celsius.

5.  Lithium iron phosphate batteries have a large capacity.

6.  Lithium iron phosphate batteries have no memory effect.

7.  Lithium iron phosphate batteries are green, environmentally friendly, non-toxic, non-polluting, have wide sources of raw materials and are cheap.

Disadvantages of LiFePO4 batteries

1.  The tap density of the positive electrode of lithium iron phosphate battery is small, and the density is generally around 0.8 to 1.3.

2.  Poor conductivity, slow lithium ion diffusion, and low actual specific capacity during high-fold charge and discharge.

3.  The low-temperature performance of lithium iron phosphate battery is poor.

4.  The life of a single lithium iron phosphate battery is long, around 2,000 times, but the life of a lithium iron phosphate battery pack is short, usually around 500 times.

Application areas of lithium iron phosphate battery

1.  Large electric vehicles: buses, electric cars, scenic tour buses, hybrid vehicles, etc.;

2.  Light electric vehicles: electric bicycles, golf carts, small flat battery vehicles, forklifts, cleaning vehicles, electric wheelchairs, etc.;

3.  Power tools: electric drill, electric saw, lawn mower, etc.;

4.  Toys such as remote control cars, boats, and airplanes;

5.  Energy storage equipment for solar and wind power generation;

6.  UPS and emergency lights, warning lights and miner's lamps (the best in terms of safety);

7.  Replaces 3V disposable lithium batteries and 9V NiCd or NiMH rechargeable batteries in cameras (exactly the same size);

8.  Small medical instruments and portable instruments, etc.

Introduction to Lithium Batteries

Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution.Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements.Therefore, lithium battery has not been applied for a long time.With the development of science and technology, lithium batteries have now become mainstream.

Advantages of lithium batteries

1.  Relatively high energy. It has high storage energy density, reaching 460-600Wh/kg, which is about 6-7 times that of lead-acid batteries;

2.  Long service life, the service life can reach more than 6 years. The battery with lithium iron phosphate as the positive electrode can be charged and discharged at 1C (100% DOD) and can be used 10,000 times;

3.  The rated voltage is high (the working voltage of a single unit is 3.7V or 3.2V), which is approximately equal to the series voltage of three nickel-cadmium or nickel-metal hydride rechargeable batteries, making it easy to form a battery power pack; lithium batteries can be adjusted by a new type of lithium battery. Using voltage regulator technology, the voltage is adjusted to 3.0V to suit the use of small electrical appliances;

4.  It has high power tolerance. The lithium iron phosphate lithium-ion battery used in electric vehicles can achieve 15-30C charge and discharge capacity, which is convenient for high-intensity starting acceleration;

5.  The self-discharge rate is very low, which is one of the most outstanding advantages of this battery. It can generally be less than 1%/month, less than 1/20 of that of nickel-metal hydride batteries;

6.  Light weight, the weight is about 1/6-1/5 of lead-acid products in the same volume;

7.  It has strong adaptability to high and low temperatures and can be used in an environment of -20℃--60℃. After technological treatment, it can be used in an environment of -45℃.

8.  Green and environmentally friendly, regardless of production, use or scrapping, it does not contain or produce any toxic or harmful heavy metal elements and substances such as lead, mercury, cadmium, etc.

9.  The production basically does not consume water, which is very beneficial for water-scarce countries. Specific energy refers to the energy per unit weight or unit volume. Specific energy is expressed in Wh/kg or Wh/L. Wh is the unit of energy, W is watt, h is hour; kg is kilogram (weight unit), L is liter (volume unit).

Disadvantages of lithium batteries

1.  Lithium primary batteries have poor safety and risk of explosion.

2.  Lithium cobalt oxide lithium-ion batteries cannot discharge at high currents, are expensive, and have poor safety.

3.  Lithium-ion batteries need protective circuits to prevent the battery from being overcharged or discharged.

4.  The production requires high conditions and high costs.

5.  The use conditions are limited, and the use of high and low temperatures is very dangerous.

Application areas of lithium batteries

1. Transportation power supply

2. Electric energy storage power supply

3. Mobile communication power supply

4. New energy storage power

5. Aerospace and military power supply

The difference between lithium iron phosphate batteries and lithium batteries

1.  Lithium iron phosphate batteries are used to make lithium-ion secondary batteries. Now the main direction is power batteries. Compared with NI-H, Ni-Cd batteries have great advantages.

2.  Lithium battery is a type of battery that uses lithium metal or lithium alloy as the cathode material and uses a non-aqueous electrolyte solution. The chemical properties of lithium metal are very active, which makes the processing, storage, and use of lithium metal very demanding on the environment.

3.  Lithium iron phosphate batteries will not catch fire or explode when punctured, but lithium batteries will.

4.  Lithium iron phosphate can withstand overcharging to 100% without catching fire or exploding; lithium batteries will gas and swell when they reach the specified value.