Solar inverter is the core power conditioning device of photovoltaic system, which accounts for 10-15% of system cost, and has high technical content. Solar inverter converts the direct current generated by solar cells into alternating current energy that can be directly integrated into the grid and load through power electronic conversion technology. However, what is the difference between a grid tied inverter and a micro inverter?
Grid tied inverter
The on grid inverter is a special kind of inverter. In addition to converting direct current into alternating current, the output alternating current can be synchronized with the frequency and phase of the mains, so the output alternating current can return to the mains. Grid tied inverters are commonly used in applications where some DC voltage sources (such as solar panels or small wind turbines) are connected to the grid.
Advantages
- Adopts modular structure. It can improve system efficiency and power quality to a certain extent, and has high reliability of parallel redundancy, convenient installation and maintenance, and saves land occupation.
- Reliability. When one or more modules fail, the system can continue to provide power to the grid, with high availability; multiple redundant modules can be selected to improve system reliability.
- Maintainability. It is easy to maintain, and module replacement time is less than 10 minutes, no professional technicians are required.
Micro inverter
A solar micro inverter is a device that converts direct current from a single solar cell module to alternating current. The DC power conversion of the micro-inverter is AC from a single solar module, each solar cell module is equipped with inverter and converter functions, and each module can perform current conversion independently. Micro inverters can achieve maximum power point tracking (MPPT) at the panel level, which has advantages over central inverters. In this way, the output power of each module can be optimized to maximize the overall output power.
Advantages
- Effectively reducing the impact of shadows caused by partial occlusion on the output power.
- In the case of uneven sunshine, diversified photovoltaic modules, and complex installation conditions, micro inverters can realize modular and distributed power generation.
- Easy installation and higher security.
