Micro-inverters generally refer to inverters with a power output of 1000 watts or less and equipped with a module-level MPPT in photovoltaic power generation systems. The full name is micro-grid-connected photovoltaic inverter. "Micro" is in contrast to traditional centralized inverters.
Traditional photovoltaic (PV) inverters connect all the direct current (DC) generated by photovoltaic cells under sunlight in series and parallel, then use an inverter to convert the DC to alternating current (AC) for grid connection. Microinverters, on the other hand, invert each module individually. Their advantages include independent MPPT control for each module, significantly improving overall efficiency, and avoiding the problems of high DC voltage, poor performance in low light, and the "weakest link" effect inherent in centralized inverters.
A solar photovoltaic microinverter is a device that converts direct current (DC) from a single solar cell module to alternating current (AC). The DC power conversion of a microinverter is from a single solar module to AC; each solar cell module is equipped with an inverter and converter function, and each module can independently perform current conversion, hence the name "microinverter."
Microinverters can achieve maximum power point tracking (MPPT) at the module level, offering advantages over centralized inverters. This allows for optimization of the output power of each module, maximizing the overall output power.
Key features of solar photovoltaic micro-inverters
1. Safety: Traditional centralized inverters or string inverters typically have DC voltages of several hundred or even thousands of volts, which are prone to fire and difficult to extinguish once started. Micro-inverters, on the other hand, have DC voltages of only tens of volts, and all are connected in parallel, minimizing safety hazards.
2. Intelligent: Component-level monitoring, the working status of each component can be seen in the ECU. [1]
3. Increased power generation: The module-level MPPT eliminates the bottleneck effect, reducing the impact of shading on power generation; it also has good low-light performance because of its low starting voltage of only 20V, allowing it to operate even in low-light conditions.
4. Long lifespan: Microinverters are typically designed for a lifespan of 25 years, while traditional inverters have a lifespan of 10 years.
5. Convenient and aesthetically pleasing: No special power distribution room is required. The micro inverter can be directly installed behind the module or on the bracket. Because it is a parallel structure, it can be directly installed when the scale is increased later without changing the previous configuration.
Solar photovoltaic microinverters are compact and aesthetically pleasing, and can be directly mounted on modules or brackets, while being lightweight. Microinverter technology proposes integrating the inverter directly with individual photovoltaic modules, equipping each module with a dedicated inverter module that features AC-DC conversion and maximum power point tracking, directly converting the electrical energy generated by the photovoltaic module into AC power for use by AC loads or for transmission to the grid.
If one solar panel malfunctions, the entire system will be affected. The other solar panels will operate at their optimal performance, resulting in higher overall system efficiency and greater power generation.
