Energy storage inverter - types, function and development analysis
Definition of energy storage inverter
The energy storage inverter is a necessary link in the energy storage system industry chain. The electrochemical energy storage system is mainly composed of battery pack, battery management system, energy management system, energy storage inverter and other electrical equipment.
Among them, the energy storage inverter can control the charging and discharging process of the energy storage battery (including lifepo4 battery, ternary lithium battery, etc.) and perform AC-DC conversion, which is a necessary link in the energy storage system.
Energy storage inverters can be divided into electrothermal energy storage inverter, aerodynamic energy storage inverter, lithium-ion energy storage inverter, and photovoltaic energy storage inverter, as follows:
Types of energy storage inverter
| Types | Introduction |
| Electrothermal energy storage inverter | Converts heat from combustible fuels into electricity that can be connected to electrical appliances in the absence of an available power source. |
| Aerodynamic energy storage inverter | Using wind power to generate electricity, the alternating current generated by the wind generator is converted into direct current, and then the energy storage inverter converts the direct current into alternating current that can be used by the power supply. |
| Lithium-ion energy storage inverter | Utilize the DC power generated by the lithium-ion power battery pack, through the conversion of the energy storage inverter, convert the DC power into AC power that can be used by the power supply. |
| Photovoltaic energy storage inverter | Using solar power to generate electricity, the DC power generated by the solar energy is converted by the energy storage inverter, and the DC power is converted into AC power that can be used by the power supply. |
The functions and advantages of energy storage inverter
Energy storage inverter can be said to be the latest generation of inverters on the market today. As the name implies, energy storage is to convert alternating current into direct current and store them in batteries. When a power outage occurs, the energy storage inverter converts the DC power in the battery into AC power for the user.
It can provide users with two-way conversion between grid power and battery power, and can break through the limitation that photovoltaic inverters can only be used during the day, which is one of the important reasons why it is becoming more and more popular with users. Next, let’s take a look at the functions and advantages of energy storage inverters:
Breakthrough the limitations of weather changes
The energy storage inverter can convert AC power into DC power and store it in the battery, and convert the DC power in the battery into AC power for users after power failure. This greatly reduces the impact of weather conditions on the stability of power generation, and can greatly improve the stability and quality of the power grid.
Higher power efficiency
Compared with grid-connected pv inverter, energy storage inverter has higher electricity efficiency. Not only can it break through the limitations of weather conditions, time, etc., solve the problems of grid-connected photovoltaic inverters, but also provide users with more stable and lasting power, and avoid inconvenience and trouble caused by power system failures. This is also an important reason why more users choose energy storage inverters.
High stability
In the case of a grid system failure, the energy storage inverter can directly convert the stored DC power into an AC power supply grid system, which is less affected by external factors, can greatly reduce electricity costs, and has high stability.
During the peak period of electricity consumption, the energy storage inverter will convert the solar direct current into alternating current and feed it into the grid for use by the majority of users. During the low power consumption period, the energy storage inverter will convert the alternating current in the grid into direct current and store it, which can realize the bidirectional conversion of direct current and alternating current, and can provide a strong guarantee for power consumption during power outages.
In addition to the above functions, the energy storage inverter can also provide more stable and pure current with less harmonic content for the power grid, which not only meets the trend and requirements of energy saving and emission reduction in today’s society, but also improves the stability and quality of the power grid.
Current status of energy storage inverter industry
Market scale
In recent years, China’s energy storage market has shown a rapid growth trend, which has created a huge demand for energy storage inverter, and the market for energy storage inverter has broad prospects.
In 2021, it will further increase to 3.07 billion RMB, a year-on-year increase of 38.91%. In 2022, the market size will reach 5.95 billion RMB, and in 2023 it will increase to 10.44 billion RMB.
Cost ratio
In terms of cost composition, the cost ratio of energy storage inverter in energy storage system is second only to battery. A complete electrochemical energy storage system is mainly composed of battery pack, energy storage inverter, energy management system, battery management system and other electrical equipment.
The data shows that batteries account for the highest cost of the entire electrochemical energy storage system, reaching 60%; followed by energy storage inverter, accounting for 20% of the cost.
Development prospect of energy storage inverter industry
Policies are good for industry development
In 2021, relevant Chinese departments issued relevant documents on accelerating the development of new energy storage, and proposed that by 2025, the installed capacity of new energy storage will reach the goal of more than 30 million kilowatts. The total installed capacity in the next 3-4 years will exceed the total growth in the previous nearly 10 years.
The goal of energy storage installed capacity, market position, and business model in 2025 have been clarified, and China’s relevant policies have been further improved. As one of the core components of the energy storage industry, energy storage inverter has broad prospects.
Release of energy storage inverter demand
As the proportion of new energy sources such as wind energy and solar energy in China’s energy system continues to increase, energy storage technologies and industries closely related to the development of new energy sources have also attracted much attention. The cost ratio of energy storage inverters in the energy storage system is second only to batteries.
The development potential of electrochemical energy storage is huge. Leading companies in various fields such as top 10 lithium ion battery manufacturers have deployed different links in the energy storage track in advance, and the release of demand promotes the development of the industry.
The replacement trend of renewable resources to traditional energy is increasingly obvious
With the strengthening of environmental protection awareness and the urgent need for energy structure reform, the trend of renewable resources replacing traditional energy is becoming more and more obvious, and the high prosperity of the photovoltaic industry can continue for a long time.
In order to achieve carbon peaking and carbon neutrality as soon as possible, China will accelerate the development of industries such as new energy and green environmental protection, and promote a comprehensive green transformation of economic and social development.
