Quick Answer
Microinverters generally last longer than traditional string inverters, with a lifespan of around 15 years compared to 10-12 years for string inverters.
Design and Complexity
String inverters are typically more complex systems than microinverters due to their central design. This complexity can lead to a higher failure rate over time. In contrast, microinverters are designed to operate independently on each panel, reducing the risk of system-wide failures.
Reliability and Testing
Microinverters have undergone extensive testing to ensure their reliability and durability. Many microinverters have undergone over 20,000 hours of salt spray and temperature cycling tests, simulating real-world conditions. This level of testing helps ensure that microinverters can withstand the elements and last for their full lifespan. In contrast, string inverters may not receive the same level of testing, which can impact their reliability.
Field Data and Studies
Research has shown that microinverters have a significantly lower failure rate than string inverters. A study by the National Renewable Energy Laboratory (NREL) found that microinverters had a failure rate of 2.3% after 10 years, compared to 10.4% for string inverters. These findings are consistent with real-world data from solar panel installations, where microinverters have proven to be more reliable and long-lasting.
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