Quick Answer
When choosing between microinverters and string inverters, consider the size and layout of your solar array, system monitoring needs, and budget. Microinverters are suitable for smaller arrays and offer more granular monitoring, while string inverters are better suited for larger arrays and often less expensive.
Choosing the Right Topology
When deciding between microinverters and string inverters, consider the layout of your solar array. For smaller arrays (less than 10 kW), microinverters are a better choice as they offer more granular monitoring and can be easily installed on individual panels. In contrast, string inverters are better suited for larger arrays (over 20 kW) where the cost savings of a single inverter outweigh the benefits of microinverter monitoring.
Monitoring and Maintenance
Microinverters provide more detailed monitoring and troubleshooting capabilities, allowing you to identify issues with individual panels rather than entire strings. This is particularly useful for arrays with shading issues or panel mismatch. However, string inverters often offer built-in monitoring and diagnostic tools, making maintenance and troubleshooting easier.
Cost and Efficiency
String inverters are generally less expensive than microinverters, especially for larger arrays. However, microinverters can offer higher efficiency due to reduced losses from long strings and improved panel matching. For example, a 10 kW microinverter system might have a 95% efficiency rating, while a 10 kW string inverter system might have an 88% efficiency rating.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.