Are String Inverters More Susceptible To Downtime Than Microinverters?

Design and Scalability Limitations

String inverters have a centralized design where all panels are connected in series, making it a single-point-of-failure system. If any issue arises in the string, such as a panel malfunction or a connection problem, the entire array is affected, leading to downtime. In contrast, microinverters are installed at each panel, allowing for isolation of the faulty unit and continued operation of the rest of the system.

Performance Monitoring and Debugging

Microinverters provide real-time monitoring and performance data for each panel, making it easier to identify and isolate issues. This localized monitoring allows for quicker diagnosis and repair, reducing downtime. In contrast, string inverters often require more complex monitoring systems and may require on-site visits to diagnose issues.

Comparison of Failure Rates

Studies have shown that microinverters have a lower failure rate than string inverters. For example, a study by Wood Mackenzie found that microinverters have a failure rate of around 0.5% per year, compared to 2.5% for string inverters. This reduced failure rate contributes to lower downtime for microinverter-based systems.