Appearance background of the solar micro inverter
On the current market, the central inverter is the most widely-used in the photovoltaic system. By definition, the central inverter is to connect the solar photovoltaic cells in series to reach a high voltage DC, and then convert it into the AC. However, the partial shadows, different inclination angles, orientations, stains, different degrees of aging, slight cracks and different temperatures of different photoelectric panels in the photovoltaic power station can easily cause system mismatch and drop of the output efficiency. Finally, the integrated output power will also be dramatically reduced. This has been a tricky issue facing the central inverter.
In response to this problem, the new framework, such as the micro-inverter or micro-converter, has been emerging in recent years. Every solar cell module is equipped with the micro-inversion power source. Through optimization of different modules' output power, the integrated output power is maximized. Even if some battery panels are affected by shadows and dust, the inversion power source optimizer can still track the best partial maximum power point (MPP), which can retrieve more than 57% of the power generation capacity lost. At the same time, the power source optimizer converts the input voltage/ current into a different output voltage/current to maximally improve the energy transmission in the system.
Definition of the solar micro inverter
The micro-inverter technology directly combines the inverter with a single photovoltaic module to equip every photovoltaic module with an inverter module which is capable of DC-AC conversion and the MPP tracking. The inverter module can directly convert the power generated by the photovoltaic module into the AC for the AC load use or transmit it to the grid.
When there is one cell panel cannot work smoothly, then only this cell panel will be affected. Other photovoltaic panels will still work under the optimal status to ensure a higher overall efficiency of the system and also a higher power generation capacity. In practical applications, when the combined inverter is in fault, cell panels of several kilowatts cannot be given into full play, while the influence caused by the fault of the micro-inverter is slight.
Advantages of a solar micro inverter
- Try to improve the power generation capacity of every inversion power source module, trace the maximum power and track the MPP of every module to improve the power generation capacity of the photovoltaic system by 25%.
- Adjust the voltage and current of every row of photoelectric panels until a full balance is achieved to avoid system mismatch.
- Besides, every module is equipped with the monitoring function to lower the system maintenance cost and increase the operation stability and reliability.
- Flexible configurations: The home users can install photovoltaic cells of different sizes according to their budget.
- There is no high voltage, which is safer, easier to install, and convenient and cheaper to maintain. Meanwhile, users can DIY the solar power generation system with less reliance on the installation service providers.
- The cost of the micro-inverter is similar to or even lower than that of the central inverter.