Introduction of micro inverter advantage and disadvantage
According to different technical routes, pv inverter products can be divided into centralized inverter, string inverter, distributed inverter and micro inverter. This article will explain to you the performance, advantages and disadvantages of micro inverter, and the market situation.
What is micro inverter
A micro inverter usually refers to an inverter with an output power of less than 1000W and a component-level MPPT function. Compared with the maximum DC input voltage of 1000V~1500V of traditional centralized inverters and string inverters, the maximum DC input voltage of the micro inverter is only about 60V.
Therefore, each MPPT loop of the micro inverter can only be connected to one photovoltaic module, so that it has module-level monitoring and MPPT functions. It is this unique design that makes the micro inverter have the incomparable characteristics and advantages of traditional inverters.
The micro inverter is also called “component-level inverter”, it belongs to a category of photovoltaic inverters. which is different from the centralized inverter, distributed inverter and cluster inverter, it is mainly used in distributed scenarios with smaller power generation scale, and is a typical application of component-level power electronics technology in photovoltaic power generation systems.
Compared with traditional centralized and string inverters, it has higher operating efficiency and better safety, and is mainly used in the current rapidly developing household power generation field.
Advantages and disadvantages of micro inverter
Advantages of micro inverter
● Component-level MPPT, high power generation efficiency
Compared with the traditional centralized and string inverters, each MPPT is connected to a string of photovoltaic arrays, and each MPPT of the micro inverter is only connected to one photovoltaic module. Therefore, the micro inverter can track the maximum power of each photovoltaic module independently, and the working states of the photovoltaic modules do not affect each other, thus avoiding the loss of power generation caused by the mismatch between the photovoltaic modules in the traditional photovoltaic string.
At the same time, when some PV modules are shaded by shadows, the use of micro inverters can prevent the shaded modules from affecting the normal operation of other modules, thereby increasing the power generation of the entire PV system.
● Lower DC input voltage, high safety
At present, the DC arcing caused by the high DC voltage of the PV strings is the main factor leading to the fire of the distributed PV power station, and it is also an important factor affecting the operation and maintenance and rescue safety of the PV power station.
The maximum DC input voltage of the micro inverter is 60V, which fundamentally solves the DC arcing problem of the photovoltaic system and significantly reduces the possibility of fire in the distributed photovoltaic power station.
At the same time, the lower DC input voltage reduces the risk of PV power plant operation, maintenance and rescue. Therefore, the use of micro inverter can significantly improve the safety of photovoltaic power plants.
● Easy installation, replacement and expansion, high flexibility
The micro inverter is small in size and light in weight, and can be directly installed on the photovoltaic bracket without making a separate bracket or installation foundation, and the installation is simple and flexible.
The micro inverter adopts the bus connection method and supports hot swapping. When the micro inverter fails, the faulty inverter can be replaced directly without stopping the operation of the entire photovoltaic system. The operation and maintenance workload is small and flexible.
When increasing the capacity of an existing photovoltaic system, there is no need to change the configuration of the previous photovoltaic system, and a new micro inverter can be added in parallel directly. In addition, the single-unit power of the micro inverter is small, the power expansion flexibility is high, and the impact on the original photovoltaic system is small, which makes the expansion flexibility of the entire photovoltaic system higher.
● Fully parallel design, high reliability
The micro inverter photovoltaic module adopts a fully parallel design and has a module-level monitoring function. When a photovoltaic module fails, it can be found in time and accurately. The replacement of components only requires the replacement of faulty components, and will not affect the normal operation of other components.
The design protection level of the micro inverter is IP67, which is higher than the protection level of traditional centralized and string inverters, and has stronger adaptability to the environment. At the same time, the micro inverter is designed to have a long service life, and the first failure time is significantly longer than that of the traditional centralized and string inverters. Therefore, the stability and reliability of the photovoltaic system are higher.
● Long life
Usually the design life of micro-inverter is 25 years, and the traditional inverter is 10 years.
● Convenient and beautiful
There is no need to build a special power distribution room, and the micro-inverter can be directly installed behind the module or on the bracket. Because it is a parallel structure, it can be installed directly when the scale is increased later without changing the previous configuration.
Disadvantage of micro inverter
● The price per watt of micro inverter is relatively high, which greatly limits the promotion and use of micro inverter in China. The current application market of micro inverter is mainly distributed in Europe and the United States with high price acceptance.
● The single-unit power of micro inverter is small. For large-scale photovoltaic power stations on the ground and distributed photovoltaic power stations with large capacity, the number of micro inverters used is huge, which increases the workload of construction and operation and maintenance. Therefore, its application scenarios are limited, and it is mainly used in households and small-capacity distributed photovoltaic power plants.
Micro inverter market introduction
Relying on its advantages of strong safety, continuous improvement in cost performance, and convenient operation and maintenance, the penetration rate of micro inverter in the application scenarios of low-power household photovoltaic systems is constantly increasing. Although the US market is firmly grasped by Enphase, Chinese companies such as Yuneng Technology and Hemai are constantly infiltrating and have achieved a certain degree of customer recognition.
In Latin America, Europe, Africa, and Asia-Pacific markets, Chinese-related companies are expected to gradually expand their channels and continue to increase their market share by virtue of their cost-effective advantages. If you want to know more about PV, please refer to and inverter battery and pv inverter companies.