Microinverters and string inverters are two types of inverters used in solar power systems. While the choice between them depends on specific circumstances and preferences, here are five reasons why microinverters are sometimes considered better than string inverters:
1. Individual Panel Optimization.
Microinverters are installed on a per-panel basis, allowing each solar panel to operate independently. This means that shading or malfunctions in one panel won’t affect the performance of the entire solar array. In contrast, string inverters connect multiple panels in series, and if one panel is shaded or underperforms, it can reduce the overall efficiency of the entire string.
2. Increased Energy Harvesting.
Microinverters maximize energy harvesting because they operate at the individual panel level. In contrast, string inverters are affected by the performance of the lowest-performing panel in the string. Microinverters can, therefore, be more efficient in situations where panels have varying levels of sunlight exposure or if there are differences in panel degradation over time.
3. Enhanced Monitoring and Maintenance.
Microinverters typically offer more detailed monitoring capabilities at the individual panel level. This allows for easier identification of any issues with specific panels, making maintenance and troubleshooting more straightforward. String inverters may only provide overall system performance data, making it more challenging to pinpoint problems at the panel level.
4. Scalability and Flexibility.
Microinverters provide more flexibility when it comes to system scalability. Additional panels can be easily added to a microinverter-based system without worrying about the impact on the entire array’s performance. With string inverters, adding more panels might require adjustments to the entire string or even the installation of an additional inverter, which can be more complex and costly.
5. Safety and Reliability.
Microinverters can enhance safety by operating at lower DC voltages compared to string inverters. String inverters typically handle higher DC voltages, which can pose safety risks during installation, maintenance, and emergencies. Microinverters’ lower voltage operation can make the system safer and reduce the risk of electric shock or fire hazards.
While microinverters have these advantages, it’s important to note that string inverters also have their own set of benefits, including generally lower upfront costs and potentially higher efficiency in certain conditions. The choice between microinverters and string inverters depends on the specific requirements of the solar installation and the preferences of the system owner.